Second Correlating Revision No. 119-NFPA 70-2016 [ … · Second Correlating Revision No. 119-NFPA...

Second Correlating Revision No. 119-NFPA 70-2016 [ Global Input ]

In all locations where the term “and labeled” has been added after “listed” during thesecond revision stage, the Correlating Committee directs that the term “and labeled”after “listed” be deleted.

This action to delete “and labeled” shall be taken in all locations where it was addedduring the First Draft and where it was added during the Second Draft. No action istaken where the terms “and marked” or “and identified” follow the word “listed.”

Submitter Information Verification

Submitter Full Name: Kimberly Shea

Organization: National Fire Protection Assoc

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Submittal Date: Fri Feb 26 09:08:59 EST 2016

Committee Statement

CommitteeStatement:

The Correlating Committee (CC) continues the action to delete “and labeled” in the second draftstage of the 2017 NEC. This CC action is taken to ensure consistent and accurate use of thedefined terms “listed” and “labeled.”

A CC task group has been established to investigate all uses of the word “listed” in the documentand develop public inputs for the 2020 NEC revision cycle. The task group will consider all relatedpublic inputs and public comments submitted during the 2017 NEC revision process.

National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara...

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Second Correlating Revision No. 121-NFPA 70-2016 [ Global Input ]

In Article 100, after each defintion insert a reference to the responsible code-making panel.

Supplemental Information

File Name Description

2014_NEC_Definition_Assignments-mwe_edits.doc NEC Definition Assignments




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Submittal Date: Fri Mar 11 08:50:53 EST 2016

Committee Statement

Committee Statement: Reference to the responsible code-making panel has been added for information.


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Second Correlating Revision No. 111-NFPA 70-2016 [ Detail ]

Add new definition to 691.2:

Electric Supply Stations. Locations containing the generating stations and substations, includingtheir associated generator, storage battery, transformer, and switchgear areas.




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Submittal Date: Thu Feb 25 16:14:12 EST 2016

Committee Statement

CommitteeStatement:

The definition of Electric Supply Stations has been relocated from the Article 691 scopestatement.


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Second Correlating Revision No. 57-NFPA 70-2016 [ Detail ]

In the title of 690.31(G), change “Dc” to “Direct Current.”




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Submittal Date: Wed Feb 24 17:14:28 EST 2016

Committee Statement

CommitteeStatement:

“Dc” was changed to “Direct Current” in the title to conform to the remainder of the NEC format(such as in all of Part VIII of Article 250, new 210.5(C)(2) where the titles of the sections use thefull words and the remainder of references to “dc” are in lower case throughout the mandatory text.


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Second Correlating Revision No. 35-NFPA 70-2016 [ Definition: Accessible, Readily

(Readily Accessible). ]

Accessible, Readily (Readily Accessible).

Capable of being easily reached quickly for operation, service renewal , or inspections without requiringthose to whom ready access is requisite to take actions such as the to use of tools (other than keys) ,the need to climb over or under, the need to remove obstacles, or the use of portable laddersor similarequipment to resort to portable ladders, and so forth . (CMP-1)

Informational Note: Use of keys is a common practice under controlled or supervised conditionsand a common alternative to the ready access requirements under such supervised conditions asprovided elsewhere in the NEC.




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Committee Statement

Committee Statement: The addition of the word “take” is editorial and improves readability.

Second Revision No. 6-NFPA 70-2015 [Definition: Accessible, Readily (Readily Accessible).]


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Second Correlating Revision No. 44-NFPA 70-2016 [ Definition: Receptacle. ]

Global SCR-119

Receptacle.

A contact device installed at the outlet for the connection of an attachment plug , or for the directconnection of electrical utilization equipment designed to mate with the corresponding contact device . Asingle receptacle is a single contact device with no other contact device on the same yoke. A multiplereceptacle is two or more contact devices on the same yoke. (CMP-18)




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Committee Statement

CommitteeStatement:

The definition is modified to remove the requirement in accordance with the NEC StyleManual.

Second Revision No. 5128-NFPA 70-2015 [Definition: Receptacle.]


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Second Correlating Revision No. 22-NFPA 70-2016 [ Section No. 110.21 ]

110.21 Marking.

(A) Equipment Markings.

(1) General.

The manufacturer’s name, trademark, or other descriptive marking by which the organization responsiblefor the product can be identified shall be placed on all electrical equipment. Other markings that indicatevoltage, current, wattage, or other ratings shall be provided as specified elsewhere in this Code. Themarking or label shall be of sufficient durability to withstand the environment involved.

(2) Reconditioned Equipment.

Reconditioned equipment shall be marked with the name, trademark, or other descriptive marking bywhich the organization responsible for reconditioning the electrical equipment can be identified, along withthe date of the reconditioning.

Reconditioned equipment shall be identified as “reconditioned” and approval of the reconditionedequipment shall not be based solely on the equipment’s original listing.

Exception: In industrial occupancies, where conditions of maintenance and supervision ensure that onlyqualified persons service the equipment, the markings indicated in 110.21(A)(2) shall not be required.

Informational Note: Industry standards are available for application of reconditioned andrefurbished equipment. Normal servicing of equipment that remains within a facility should not beconsidered reconditioning or refurbishing.

(B) Field-Applied Hazard Markings.

Where caution, warning, or danger signs or labels are required by this Code, the labels shall meet thefollowing requirements:

(1) The marking shall warn of the hazards using effective words, colors, symbols, or any combinationthereof.

Informational Note: ANSI Z535.4-2011, Product Safety Signs and Labels, provides guidelinesfor suitable font sizes, words, colors, symbols, and location requirements for labels.

(2) The label shall be permanently affixed to the equipment or wiring method and shall not behandwritten.

Exception to (2): Portions of labels or markings that are variable, or that could be subject tochanges, shall be permitted to be handwritten and shall be legible.

(3) The label shall be of sufficient durability to withstand the environment involved.

Informational Note: ANSI Z535.4-2011, Product Safety Signs and Labels, provides guidelines forthe design and durability of safety signs and labels for application to electrical equipment.




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Submittal Date: Tue Feb 23 17:10:08 EST 2016

Committee Statement


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Committee Statement: Revision made to comply with the NEC Style Manual.

Committee Comment No. 9-NFPA 70-2015 [Section No. 110.21]


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110.30 General.

Conductors and equipment used on circuits over 1000 volts, nominal, shall comply with Part I of thisarticle and with 110.30 through 110.40 110.41 , which supplement or modify Part I. In no case shall theprovisions of this part apply to equipment on the supply side of the service point.




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Committee Statement

CommitteeStatement:

Change made to properly allow the application of newly added 110.41 and eliminates theunintended conflict between the two sections in Part III of the article.


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Second Correlating Revision No. 23-NFPA 70-2016 [ Section No. 110.31(D) ]

(D) Enclosed Equipment Accessible to Unqualified Persons.

Ventilating or similar openings in equipment shall be designed such that foreign objects inserted throughthese openings are deflected from energized parts. Where exposed to physical damage from vehiculartraffic, suitable guards shall be provided. Equipment located outdoors and accessible to unqualifiedpersons shall be designed such that exposed nuts or bolts cannot be readily removed, permitting accessto live parts. Where equipment is accessible to unqualified persons and the bottom of the enclosure is lessthan 2.5 m (8 ft) above the floor or grade level, the enclosure door or hinged cover shall be kept locked.Doors and covers of enclosures used solely as pull boxes, splice boxes, or junction boxes shall be locked,bolted, or screwed on. Underground box covers that weigh over 45.4 kg (100 lb) shall meet thisrequirement be considered as meeting this requirement .




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Committee Statement

Committee Statement: Revision made to comply with the NEC Style Manual.

Second Revision No. 20-NFPA 70-2015 [Section No. 110.31(D)]


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110.73 Equipment Work Space.

Where electrical equipment with live parts that is likely to require examination, adjustment, servicing, ormaintenance while energized is installed in a manhole, vault, or other enclosure designed for personnelaccess, the work space and associated requirements in 110.26 shall be met for installations operating at1000 volts or less. Where the installation is over 1000 volts, the work space and associated requirementsin 110.34 shall be met. A manhole access cover that weighs over 45 45.4 kg (100 lb) shall meet beconsidered as meeting the requirements of 110.34(C).




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Committee Statement

CommitteeStatement:

Revision made to comply with Style Manual requirements and consistency with110.31(D).

Second Revision No. 22-NFPA 70-2015 [Section No. 110.73]


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Second Correlating Revision No. 68-NFPA 70-2016 [ Section No. 210.5(C)(1) ]

(1) Branch Circuits Supplied from More Than One Nominal Voltage System.

Where the premises wiring system has branch circuits supplied from more than one nominal voltagesystem, each ungrounded conductor of a branch circuit shall be identified by phase or line and system atall termination, connection, and splice points in compliance with 210.5(C)(1)(a) and (b).

(a) Means of Identification. The means of identification shall be permitted to be by separate colorcoding, marking tape, tagging, or other approved means.

(b) Posting of Identification Means. The method utilized for conductors originating within eachbranch-circuit panelboard or similar branch-circuit distribution equipment shall be documented in amanner that is readily available or shall be permanently posted at each branch-circuit panelboard orsimilar branch-circuit distribution equipment. The label shall be of sufficient durability to withstand theenvironment involved and shall not be handwritten.

Exception: In existing installations where a voltage system(s) already exists and a different voltagesystem is being added, it is shall be permissible to mark only the new system voltage. Existingunidentified systems shall not be required to be identified at each termination, connection, and splicepoint in compliance with 210.5(C)(1)(a) and (b). Labeling is shall be required at each voltage systemdistribution equipment to identify that only one voltage system has been marked for a new system(s).The new system label(s) shall include the words “other unidentified systems exist on the premises.”




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Committee Statement

Committee Statement: Revised to comply with the NEC Style Manual.

Second Revision No. 304-NFPA 70-2015 [Section No. 210.5(C)(1)]


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Second Correlating Revision No. 117-NFPA 70-2016 [ Section No. 210.8(B) [Excluding

any Sub-Sections] ]

All 125-volt, single-phase, 15- and 20-ampere receptacles single-phase receptacles rated 150 volts toground or less, 50 amperes or less and three-phase receptacles rated 150 volts to ground or less, 100amperes or less installed in the following locations specified in 210.8(B)(1) through (8) shall haveground-fault circuit-interrupter protection for personnel.

(1) Bathrooms

(2) Kitchens

(3) Rooftops

Exception: Receptacles on rooftops shall not be required to be readily accessible other than fromthe rooftop.

(4) Outdoors

Exception No. 1 to (3) and (4): Receptacles that are not readily accessible and are supplied by abranch circuit dedicated to electric snow-melting, deicing, or pipeline and vessel heating equipmentshall be permitted to be installed in accordance with 426.28 or 427.22, as applicable.

Exception No. 2 to (4): In industrial establishments only, where the conditions of maintenance andsupervision ensure that only qualified personnel are involved, an assured equipment groundingconductor program as specified in 590.6(B)(3) shall be permitted for only those receptacle outletsused to supply equipment that would create a greater hazard if power is interrupted or having adesign that is not compatible with GFCI protection.

(5) Sinks — where receptacles are installed within 1.8 m (6 ft) of from the outside top inside edge of thebowl of the sink

Exception No. 1 to (5): In industrial laboratories, receptacles used to supply equipment whereremoval of power would introduce a greater hazard shall be permitted to be installed without GFCIprotection.

Exception No. 2 to (5): For receptacles located in patient bed locations of general care (Category2) or critical care areas (Category 1) spaces of health care facilities other than those coveredunder 210.8(B)(1), GFCI protection shall not be required.

(6) Indoor wet locations

(7) Locker rooms with associated showering facilities

(8) Garages, service bays, and similar areas other than vehicle exhibition halls and showrooms

(9) Crawl spaces — GFCI protection shall be provided for lighting outlets in crawl spaces at or belowgrade level

(10) Unfinished basements —for the purposes of this section, unfinished basements are defined asportions or areas of the basement not intended as habitable rooms




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Committee Statement

CommitteeStatement:

This revision removes a redundancy for correlation as this requirement now exists in210.8(E)


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Second Correlating Revision No. 67-NFPA 70-2016 [ Section No. 210.52(C) ]

(C) Countertops and Work Surfaces .

In kitchens, pantries, breakfast rooms, dining rooms, and similar areas of dwelling units, receptacle outletsfor countertop and work surfaces spaces shall be installed in accordance with 210.52(C)(1) through(C)(5).

(1) Wall Countertop and Work Surface . Spaces .

A receptacle outlet shall be installed at each wall countertop and work surface space that is 300 mm (12in.) or wider. Receptacle outlets shall be installed so that no point along the wall line is more than 600 mm(24 in.) measured horizontally from a receptacle outlet in that space.

Exception: Receptacle outlets shall not be required on a wall directly behind a range, counter-mountedcooking unit, or sink in the installation described in Figure 210.52(C)(1).

Figure 210.52(C)(1) Determination of Area Behind a Range, or Counter-Mounted Cooking Unit, orSink.

(2) Island Countertop Spaces.

At least one receptacle shall be installed at each island countertop space with a long dimension of 600mm (24 in.) or greater and a short dimension of 300 mm (12 in.) or greater.


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(3) Peninsular Countertop Spaces.

At least one receptacle outlet shall be installed at each peninsular countertop long dimension space with along dimension of 600 mm (24 in.) or greater and a short dimension of 300 mm (12 in.) or greater. Apeninsular countertop is measured from the connected perpendicular wall.

A receptacle in a wall countertop space shall be permitted to serve as the receptacle for a peninsularcountertop space where the spaces are contiguous and the receptacle is located within 1.8 m (6 ft) of theoutside edge of the peninsular countertop.

(4) Separate Spaces.

Countertop spaces separated by rangetops, refrigerators, or sinks shall be considered as separatecountertop spaces in applying the requirements of 210.52(C)(1) . If a range, counter-mounted cookingunit, or sink is installed in an island or peninsular countertop and the depth of the countertop behind therange, counter-mounted cooking unit, or sink is less than 300 mm (12 in.), the range, counter-mountedcooking unit, or sink shall be considered to divide the countertop space into two separate countertopspaces. Each separate countertop space shall comply with the applicable requirements in 210.52(C).

(5) Receptacle Outlet Location.

Receptacle outlets shall be located on or above, but not more than 500 mm (20 in.) above, the countertopor work surface . Receptacle outlet assemblies listed for use in countertops or work surfaces shall bepermitted to be installed in countertops or work surfaces . Receptacle outlets rendered not readilyaccessible by appliances fastened in place, appliance garages, sinks, or rangetops as covered in210.52(C)(1), Exception, or appliances occupying dedicated space shall not be considered as theserequired outlets.

Informational Note: See 406.5(E)and 406.5(G) for requirements for installation of receptacles incountertops and 406.5(F)and 406.5(G) for requirements for installation of receptacles in worksurfaces.

Exception to (5): To comply with the following conditions specified in (1) or and (2), receptacle outletsshall be permitted to be mounted not more than 300 mm (12 in.) below the countertop or work surface .Receptacles mounted below a countertop or work surface in accordance with this exception shall not belocated where the countertop or work surface extends more than 150 mm (6 in.) beyond its supportbase.

(1) Construction for the physically impaired

(2) On island and peninsular countertops or work surface where the countertop surface is flat acrossits entire surface (no backsplashes, dividers, etc.) and there are no means to mount a receptaclewithin 500 mm (20 in.) above the countertop or work surface , such as an overhead cabinet




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Committee Statement

CommitteeStatement:

This action correlates the use of the phrase “work surface” rather than the inconsistentintroduction of the term “workspace.”

Committee Comment No. 309-NFPA 70-2015 [Section No. 210.52(C)]


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220.3 Application of Other Articles for Specific-Purpose Calculations .

In other articles applying to the calculation of loads in specialized applications, there are requirementsprovided in Table 220.3that are in addition to, or modifications of, those within shall provide referencesfor specific-purpose calculation requirements not located in Chapters 5 , 6 , or 7 that amend orsupplement the requirements of this article.

Table 220.3 Additional Load Specific-Purpose Calculation References

Calculation Article Section (orPart)

Air-conditioning and refrigerating equipment, branch-circuit conductor sizing 440 Part IV

Cranes and hoists, rating and size of conductors 610 610.14

Electric vehicle charging system branch-circuit and feeder calculations 625 625.41

Electric welders, ampacity calculations 630 630.11, 630.31

Electrically driven or controlled irrigation machines 675675.7(A),675.22(A)

Electrified truck parking space 626

Electrolytic cell lines 668 668.3(C)

Electroplating, branch-circuit conductor sizing 669 669.5

Elevator feeder demand factors 620 620.14

Fixed electric heating equipment for pipelines and vessels, branch-circuit sizing 427 427.4

Fixed electric space-heating equipment, branch-circuit sizing 424 424.3

Fixed outdoor electric deicing and snow-melting equipment, branch-circuit sizing 426 426.4

Industrial machinery, supply conductor sizing 670 670.4(A)

Marinas and boatyards, feeder and service load calculations 555 555.12

Mobile homes, manufactured homes, and mobile home parks, total load fordetermining power supply

550 550.18(B)

Mobile homes, manufactured homes, and mobile home parks, allowabledemand factors for park electrical wiring systems

550 550.31

Motion picture and television studios and similar locations — sizing of feederconductors for television studio sets

530 530.19

Motors, feeder demand factor 430 430.26

Motors, multimotor and combination-load equipment 430 430.25

Motors, several motors or a motor(s) and other load(s) 430 430.24

Over 600-volt branch-circuit calculations 210 210.19(B)

Over 600-volt feeder calculations 215 215.2(B)

Phase converters, conductors 455 455.6

Recreational vehicle parks, basis of calculations 551 551.73(A)

Storage-type water heaters 422 422.11(E)

Theaters, stage switchboard feeders 520 520.27





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Committee Statement

Committee Statement: Revised to comply with the NEC Style Manual



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230.7 Other Conductors in Raceway or Cable.

Conductors other than service conductors shall not be installed in the same service raceway or servicecable in which the service conductors are installed .

Exception No. 1: Grounding electrode conductors or supply side bonding jumpers or conductors shallbe permitted within service raceways .

Exception No. 2: Load management control conductors having overcurrent protection shall be permittedwithin service raceways .




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Committee Statement: Revised for correlation and clarity.



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230.29 Supports over Buildings.

Service conductors passing over a roof shall be securely supported by substantial structures. For agrounded system, where the substantial structure is metal, it shall be bonded by means of a bondingjumper and listed connector to the grounded overhead service conductor. The bonding jumper shall be ofthe same conductor size and material as the grounded overhead service conductor. Where practicable,such supports shall be independent of the building.




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Committee Statement

CommitteeStatement:

Bonding jumper requirements are removed from this section for correlation as they areadequately covered in 250.102



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Second Correlating Revision No. 59-NFPA 70-2016 [ Section No. 230.42(A) ]

(A) General.

The ampacity of service Service -entrance conductors shall have an ampacity of not be smaller less thanthe maximum load to be served. Conductors shall be sized to carry not less than the largest required in of230.42(A)(1), or (A)(2), or (A)(3) . Loads shall be determined in accordance with Part III, IV, or V of Article220, as applicable. Ampacity shall be determined from 310.15. The maximum allowable current ofbusways shall be that value for which the busway has been listed and or labeled.

(1) The Where the service-entrance conductors supply continuous loads or any combination ofnoncontinuous and continuous loads, the minimum service-entrance conductor size shall have anallowable ampacity not less than the sum of the noncontinuous loads plus 125 percent of continuousloads.

Exception No. 1: Grounded conductors that are not connected to an overcurrent device shall bepermitted to be sized at 100 percent of the sum of the continuous and noncontinuous load.

Exception No. 2: The sum of the noncontinuous load and the continuous load if the service-entrance conductors terminate in an overcurrent device where both the overcurrent device and itsassembly are listed for operation at 100 percent of their rating shall be permitted.

(2) The sum of the noncontinuous load plus the continuous load minimum service-entrance conductorsize shall have an ampacity not less than the maximum load to be served after the application of anyadjustment or correction factors.




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Committee Statement

CommitteeStatement:

Changed “and” to “or” in the last sentence of (A) to indicate that the busway can be listed orlabeled since busways are under the jurisdiction of Panel 8.

The text in (3) was moved to an Exception to correlate requirements with existing text in 215.2and 210.19 as directed by the Correlating Committee in the CC Note No. 62.

Committee Comment No. 910-NFPA 70-2015 [Section No. 230.42(A)]


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230.44 Cable Trays.

Cable tray systems shall be permitted to support service-entrance conductors. Cable trays used tosupport service-entrance conductors shall contain only service-entrance conductors and shall be limited tothe following methods:

(1) Type SE cable

(2) Type MC cable

(3) Type MI cable

(4) Type IGS cable

(5) Single conductors 1/0 and larger that are listed for use in cable tray or cable assemblies with TypeTC rating

Such cable trays shall be identified with permanently affixed labels with the wording “Service-EntranceConductors.” The labels shall be located so as to be visible after installation with a spacing not to exceed3 m (10 ft) so that the service-entrance conductors are able to be readily traced through the entire lengthof the cable tray.

Exception: Conductors, other than service-entrance conductors, shall be permitted to be installed in acable tray with service-entrance conductors, provided a solid fixed barrier of a material compatible withthe cable tray is installed to separate the service-entrance conductors from other conductors installed inthe cable tray.




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Committee Statement

Committee Statement: The new (6) has been removed as it is new material that has not had public review.



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Global SCR-119

230.66 Marking.

Service equipment rated at 1000 volts or less shall be marked to identify it as being suitable for use asservice equipment. All service equipment shall be listed or field labeled. Individual meter socketenclosures shall not be considered service equipment but shall be listed and rated for the voltage andampacity of the service.

Exception: Meter sockets purchased or supplied by and under the exclusive control of an electricutility are shall not be required to be listed.



SCR-61_230.66.docx For staff use only




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Committee Statement

CommitteeStatement:

The exception has been revised for clarity. The use of the word "purchased" does not improveusability and replaced with the words "supplied by."



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Second Correlating Revision No. 48-NFPA 70-2016 [ Section No. 250.4(A)(1) ]

(1) Electrical System Grounding.

Electrical systems that are grounded shall be connected to earth in a manner that will limit the voltageimposed by lightning, line surges, or unintentional contact with higher-voltage lines and that will stabilizethe voltage to earth during normal operation.

Informational Note No. 1: An important consideration for limiting the imposed voltage is the routingof bonding and grounding electrode conductors so that they are not any longer than necessary tocomplete the connection without disturbing the permanent parts of the installation and so thatunnecessary bends and loops are avoided.

Informational Note No. 2: See NFPA 780-2017 2014 , Standard for the Installation of LightningProtection Systems, for information on installation of grounding and bonding for lightning protectionsystem grounding systems .




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Committee Statement

Committee Statement: This is an editorial correction to improve grammar and clarity.

Committee Comment No. 1202-NFPA 70-2015 [Section No. 250.4(A)(1)]


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Second Correlating Revision No. 49-NFPA 70-2016 [ Section No. 250.4(B)(1) ]

(1) Grounding Electrical Equipment.

Non–current-carrying conductive materials enclosing electrical conductors or equipment, or forming part ofsuch equipment, shall be connected to earth in a manner that will limit the voltage imposed by lightning orunintentional contact with higher-voltage lines and limit the voltage to ground on these materials.

Informational Note: See NFPA 780 -2014, Standard for the Installation of Lightning ProtectionSystems , for information on installation of grounding and bonding for lightning protection systems.



SCR-49_250.4_B_1.docx For staff use.




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Committee Statement

Committee Statement: This is an editorial correction to improve grammar and clarity.

Committee Comment No. 1201-NFPA 70-2015 [Section No. 250.4(B)(1)]


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Second Correlating Revision No. 50-NFPA 70-2016 [ Section No. 250.64(B) ]

(B) Securing and Protection Against Physical Damage.

Where exposed, a grounding electrode conductor or its enclosure shall be securely fastened to thesurface on which it is carried. Grounding electrode conductors shall be permitted to be installed on orthrough framing members.300.5 .

(1) Not Exposed to Physical Damage.

A 6 AWG or larger copper or aluminum grounding electrode conductor not exposed to physical damageshall be permitted to be run along the surface of the building construction without metal covering orprotection.

(2) Exposed to Physical Damage.

A 6 AWG or larger copper or aluminum grounding electrode conductor exposed to physical damage shallbe protected in rigid metal conduit (RMC), intermediate metal conduit (IMC), rigid polyvinyl chlorideconduit (PVC), reinforced thermosetting resin conduit Type XW (RTRC-XW ), electrical metallic tubing(EMT), or cable armor.

(3) Smaller Than 6 AWG.

Grounding electrode conductors smaller than 6 AWG shall be protected in RMC, IMC, PVC, RTRC-XW,EMT, or cable armor.

(4) In Contact with the Earth.

Grounding electrode conductors and grounding electrode bonding jumpers in contact with the earth shallnot be required to comply with 300.5, but shall be buried or otherwise protected if subject to physicaldamage.




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Committee Statement

CommitteeStatement:

Text was modified to correlate with the wording used by CMP 8 in Article 355 forRTRC-XW

Second Revision No. 1213-NFPA 70-2015 [Section No. 250.64(B)]


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(C) Grounding Electrode Conductor Connections.

Grounding electrode conductors and bonding jumpers shall be permitted to be connected at the followinglocations and used to extend the connection to an electrode(s):

(1) Interior metal water piping shall be that is electrically continuous with a metal underground waterpipe electrode and is located not more than 1.52 m (5 ft) from the point of entrance to the buildingshall be permitted to extend the connection to an electrode(s) . Interior metal water piping locatedmore than 1.52 m (5 ft) from the point of entrance to the building shall not be used as a conductor tointerconnect electrodes of the grounding electrode system.

Exception: In industrial, commercial, and institutional buildings or structures, if conditions ofmaintenance and supervision ensure that only qualified persons service the installation, interiormetal water piping located more than 1.52 m (5 ft) from the point of entrance to the building shallbe permitted as a bonding conductor to interconnect electrodes that are part of the groundingelectrode system, or as a grounding electrode conductor, if the entire length, other than shortsections passing perpendicularly through walls, floors, or ceilings, of the interior metal water pipethat is being used for the conductor is exposed.

(2) The metal structural frame of a building shall be permitted to be used as a conductor to interconnectelectrodes that are part of the grounding electrode system, or as a grounding electrode conductor.Hold-down bolts securing the structural steel column that are connected to a concrete-encasedelectrode that complies with 250.52(A)(3) and is located in the support footing or foundation shall bepermitted to connect the metal structural frame of a building or structure to the concrete encasedgrounding electrode. The hold-down bolts shall be connected to the concrete-encased electrode bywelding, exothermic welding, the usual steel tie wires, or other approved means.

(3) A rebar-type concrete-encased electrode installed in accordance with 250.52(A)(3)with an additionalrebar section extended from its location within the concrete to an accessible location that is notsubject to corrosion shall be permitted for connection of the grounding electrodeconductor conductors and bonding jumpers . The rebar extention extension shall not be exposed tocontact with the earth without corrosion protection.



SCR-51_250.68_C_.docx For staff use only




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Committee Statement

Committee Statement: Text was added to make (1) a complete sentence.

Committee Comment No. 1216-NFPA 70-2015 [Section No. 250.68(C)]


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Second Correlating Revision No. 52-NFPA 70-2016 [ Section No. 250.122(F)(1) ]

(1) Conductor Installations in Raceways, Auxiliary Gutters, or Cable Trays.

(a) Single Raceway or Cable Tray. If conductors are installed in parallel in the same raceway, orcable trays tray, a single wire wire- type conductor shall be permitted as the equipment groundingconductor. The wire wire- type equipment grounding conductor shall be sized in accordance with250.122, based on the overcurrent protective device for the feeder or branch circuit. Wire Wire- typeequipment grounding conductors installed in cable trays shall meet the minimum requirements of392.10(B)(1)(c). Cable Metal raceways or auxiliary gutters in accordance with 250.118 or cable trayscomplying with 392.60(B), metal raceways in accordance with 250.118 , or auxiliary gutters, shall bepermitted as the equipment grounding conductor.

(b) Multiple Raceways. If conductors are installed in parallel in multiple raceways, wire-typeequipment grounding conductors, where used, shall be installed in parallel in each raceway. Theequipment grounding conductor installed in each raceway shall be sized in compliance with 250.122.Cable based on the overcurrent protective device for the feeder or branch circuit. Metal raceways orauxiliary gutters in accordance with 250.118 or cable trays complying with 392.60(B) , metal racewaysin accordance with 250.118 , or auxiliary gutters, shall be permitted as the equipment groundingconductor.




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Committee Statement

Committee Statement: Editorial correction to replace noun with adjective.

Committee Comment No. 1226-NFPA 70-2015 [Section No. 250.122(F)(1)]


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(2) Multiconductor Cables.

(a) If multiconductor cables are installed in parallel, the equipment grounding conductor(s) in eachcable shall be connected in parallel. Except as provided in 250.122(F)(2)(b) for raceway or cable trayinstallations, the equipment grounding conductor in each multiconductor cable shall be sized inaccordance with 250.122 .

(b) If multiconductor cables are installed in parallel in the same raceway, auxiliary gutter, or cabletray, a single equipment grounding conductor that is sized in accordance with 250.122 shall be permittedin combination with the equipment grounding conductors provided within the multiconductor cables andshall all be connected together.

(c) Equipment grounding conductors installed in cable trays shall meet the minimum requirements of392.10(B)(1)(c). Cable trays complying with 392.60(B), metal raceways in accordance with 250.118, orauxiliary gutters shall be permitted as the equipment grounding conductor.

(d) Except as provided in 250.122(F)(2)(b) for raceway or cable tray installations, the equipmentgrounding conductor in each multiconductor cable shall be sized in accordance with 250.122 based onthe overcurrent protective device for the feeder or branch circuit.




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Committee Statement

Committee Statement: Editorial correction to replace noun with adjective.

Committee Comment No. 1224-NFPA 70-2015 [Section No. 250.122(F)(2)]


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(1) Installation.

Power distribution blocks installed in metal wireways shall be listed. Power distribution blocks installed onthe line side of the service equipment shall be listed marked “suitable for the purpose use on the line sideof service equipment" or equivalent .




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Committee Statement

Committee Statement: Revision made to correlate with the action taken on SR 2407, 314.28(E)(1).

Second Revision No. 2101-NFPA 70-2015 [Section No. 376.56(B)(1)]


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400.1 Scope.

This article covers general requirements, applications, and construction specifications for flexible cordsand flexible cables.

Informational Note: UL 817, Cord Sets and Power-Supply Cords, allows the use of flexible cordsmanufactured in accordance with UL 62, Flexible Cords and Cables. Cord sets and power-supplycords are restricted in use by the requirements in Article 400 . See 400.10 and 400.12 forflexible cords that are part of a listed cord set or power-supply cord.




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CommitteeStatement:

Revised for clarity and to conform the text voted on at the Second Draft meeting by the TC.Additional revisions are made to the text to comply with the NEC Style Manual.



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(C) Switches Controlling Lighting Loads.

The grounded circuit conductor for the controlled lighting circuit shall be installed at the location whereswitches control lighting loads that are supplied by a grounded general-purpose branch circuit servingbathrooms, hallways, stairways, or rooms suitable for human habitation or occupancy as defined in theapplicable building code. Where multiple switch locations control the same lighting load such that theentire floor area of the room or space is visible from the single or combined switch locations, thegrounded circuit conductor shall only be required at one location . A grounded conductor shall not berequired to be installed at lighting switch locations under any of the following conditions:

(1) Where conductors enter the box enclosing the switch through a raceway, provided that the racewayis large enough for all contained conductors, including a grounded conductor

(2) Where the box enclosing the switch is accessible for the installation of an additional or replacementcable without removing finish materials

(3) Where snap switches with integral enclosures comply with 300.15(E)

(3) Where a switch serves other than a bathroom, hallway, stairway, or a room suitable for humanhabitation or other occupancy as defined in the applicable building code

(3) Where multiple switch locations control the same lighting load such that the entire floor area of theroom or space is visible from the single or combined switch locations, the grounded circuitconductor shall only be required at one location.

(4) Where lighting in the area is controlled by automatic means

(5) Where a switch controls a receptacle load

The grounded conductor shall be extended to any switch location as necessary and shall be connected toswitching devices that require line-to-neutral voltage to operate the electronics of the switch in thestandby mode and shall meet the requirements of 404.22 .

Exception: The connection requirement shall become effective on January 1, 2020. It shall not apply toreplacement or retrofit switches installed in locations prior to local adoption of 404.2(C) and where thegrounded conductor cannot be extended without removing finish materials. The number of electroniclighting control switches on a branch circuit shall not exceed five, and the number connected to anyfeeder on the load side of a system or main bonding jumper shall not exceed 25. For the purpose of thisexception, a neutral busbar, in compliance with 200.2(B) and to which a main or system bondingjumper is connected shall not be limited as to the number of electronic lighting control switchesconnected.

Informational Note: The provision for a (future) grounded conductor is to complete a circuit path forelectronic lighting control devices.




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Committee Statement


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Committee Statement: The last sentence in the Exception has been modified to add clarity.

Second Revision No. 2408-NFPA 70-2015 [Section No. 404.2(C)]


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404.22 Electronic Lighting Control Switches.

Electronic lighting control switches shall be listed. They Electronic lighting control switches shall notintroduce current on the equipment grounding conductor during normal operation. The requirement to notintroduce current on the equipment grounding conductor shall take effect on January 1, 2020.

Exception: Electronic lighting control switches that introduce current on the equipment groundingconductor shall be permitted for applications covered by 404.2(C) , Exception. Electronic lightingcontrol switches that introduce current on the equipment grounding conductor shall be listed andmarked for use in replacement or retrofit applications only.



SCR-55_404.22.docx For staff use only




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Committee Statement

CommitteeStatement:

The NEC cannot limit the manufacturing of electronic lighting control switches. The word “They”is not descriptive enough to clarify which lighting control switches are implied.



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Second Correlating Revision No. 56-NFPA 70-2016 [ Definition: Outlet Box Hood. ]

Outlet Box Hood.

A housing shield intended to fit over a faceplate for flush-mounted wiring devices, or an integralcomponent of an outlet box or of a faceplate for flush-mounted wiring devices. The hood does not serve tocomplete the electrical enclosure; it reduces the risk of water coming in contact with electrical componentswithin the hood, such as attachment plugs, current taps, surge protective devices, direct plug-intransformer units, or wiring devices. It is commonly known as a “bubble cover.”




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CommitteeStatement:

The last sentence was deleted to remove the reference to"Bubble cover” as it is industryjargon and not acceptable in a definition.


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Second Correlating Revision No. 47-NFPA 70-2016 [ Section No. 406.4(D)(4) ]

(4) Arc-Fault Circuit-Interrupter Protection.

Where a receptacle outlet is supplied by a branch circuit that requires arc-fault circuit-interrupterprotection as specified elsewhere in this Code located in any areas specified in 210.12(A) or (B) , areplacement receptacle at this outlet shall be one of the following:

(1) A listed outlet branch-circuit type arc-fault circuit-interrupter receptacle

(2) A receptacle protected by a listed outlet branch-circuit type arc-fault circuit-interrupter type receptacle

(3) A receptacle protected by a listed combination type arc-fault circuit-interrupter type circuit breaker

Exception No. 1: Arc-fault circuit-interrupter protection shall not be required where all of the followingapply :

(1) The replacement complies with 406.4(D)(2)(b).

(2) It is impracticable to provide an equipment grounding conductor as provided by 250.130(C).

(3) A receptacle protected by a listed combination type arc-fault circuit-interrupter circuit breaker is notcommercially available.

(4) There is no GFCI/AFCI combination dual function receptacles are not commercially available.

Exception No. 2: Section 210.12(B) exception does , Exception shall not apply to replacement ofreceptacles.




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Committee Statement

Committee Statement: Revised to comply with 90.5 of the NEC.

Committee Comment No. 5105-NFPA 70-2015 [Section No. 406.4(D)(4)]


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406.12 Tamper-Resistant Receptacles.

Tamper-resistant receptacles shall be installed as All 15- and 20-ampere, 125- and 250-voltnonlocking-type receptacles in the areas specified in 406.12(1) 406.12(1)406.12(A) through (G) (7) shallbe listed tamper-resistant receptacles .

(1) Dwelling units in all areas specified in 210.52 and 550.13

(2) Guest rooms and guest suites of hotels and motels

(3) Child care facilities

(4) Preschools and elementary education facilities

(5) Business offices, corridors, waiting rooms and the like in clinics, medical and dental offices andoutpatient facilities

(6) Subset of assembly occupancies described in Article 518.2 to include places of waitingtransportation, gymnasiums, skating rinks, and auditoriums

(7) Dormitories

Informational Note: This requirement would include receptacles identified as 5-15, 5-20, 6-15, and6-20 in ANSI/NEMA WD 6-2016, Wiring Devices — Dimensional Specifications .

Exception to (1), (2), (3), (4), (5), (6), and (7): Receptacles in the following locations shall not be requiredto be tamper resistant:

(1) Receptacles located more than 1.7 m (5 1⁄2 ft) above the floor

(2) Receptacles that are part of a luminaire or appliance

(3) A single receptacle or a duplex receptacle for two appliances located within the dedicated spacefor each appliance that, in normal use, is not easily moved from one place to another and that iscord-and-plug-connected in accordance with 400.10(A)(6), (A)(7), or (A)(8)

(4) Nongrounding receptacles used for replacements as permitted in 406.4(D)(2)(a)

(A) Dwelling Units.

In all areas specified in 210.52 and 550.13 , all nonlocking-type 15- and 20-ampere receptacles shallbe listed tamper-resistant receptacles.

(B) Guest Rooms and Guest Suites of Hotels and Motels.

All nonlocking-type 15- and 20-ampere receptacles located in guest rooms and guest suites of hotelsand motels shall be listed tamper-resistant receptacles.

(C) Child Care Facilities.

In all child care facilities, all nonlocking-type 15- and 20-ampere receptacles shall be listed tamper-resistant receptacles.

(D) Preschools and Elementary Education Facilities.

All nonlocking-type, 15- and 20-ampere receptacles located in preschools and elementary educationfacilities shall be listed tamper-resistant receptacles.

(E) Business Offices, Corridors, Waiting Rooms and the Like in Clinics, Medical and Dental Offices andOutpatient Facilities.

All nonlocking-type, 15- and 20-ampere receptacles located in business offices, corridors, waitingrooms, and the like in clinics, medical and dental offices, and outpatient facilities shall be listed tamper-resistant receptacles.


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(F) Subset of Assembly Occupancies Described in Article 518.2 to Include Places of WaitingTransportation, Gymnasiums, Skating Rinks, and Auditoriums.

All nonlocking-type, 15- and 20-ampere receptacles located in places of waiting transportation,gymnasiums, skating rinks, and auditoriums shall be listed tamper-resistant receptacles.

(G) Dormitories.

All nonlocking-type, 15- and 20-ampere receptacles shall be listed tamper-resistant receptacles.




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Committee Statement

Committee Statement: The Information Note is revised to remove the mandatory requirement.



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Second Correlating Revision No. 1-NFPA 70-2016 [ Sections 409.22, 409.23 ]

409.22 Short-Circuit Current Rating.

(A) Installation.

An industrial control panel shall not be installed where the available fault short-circuit current exceeds itsshort-circuit current rating as marked in accordance with 409.110(4).

(B) Available Fault Current. Documentation.

When If an industrial control panel is required to be marked with a short circuit short-circuit current ratingin accordance with 409.110(4), the available short circuit short-circuit current at the industrial controlpanel and the date the short circuit short-circuit current calculation was performed shall be documentedand made available to those authorized to inspect the installation.




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CommitteeStatement:

The Correlating Committee changed "When" to "If" in 409.22(B) to comply with the NECStyle Manual.

Second Revision No. 3003-NFPA 70-2015 [Sections 409.22, 409.23]


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(A) General.

Appliances identified in 422.5(A)(1) through (7) rated 250 volts or less and 60 amperes or less, single- or3-phase, shall be provided with GFCI protection for personnel. Multiple GFCI protective devices shall bepermitted but shall not be required.

(1) Automotive vacuum machines provided for public use

(1) Boat hoists

(2) Drinking water coolers

(2) Dwelling unit dishwashers

(3) High-pressure spray washing machines — cord-and-plug-connected

(4) Tire inflation machines provided for public use

(5) Vending machines




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Committee Statement

CommitteeStatement:

List items (2) and (4) have been removed to correlate with the GFCI requirements for boathoists and dishwashers in dwelling units that have been retained in Article 210.


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(A) General.




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Committee Statement

Committee Statement: This title "(A) General" was deleted to correlate with the deletion of (B).


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(B) Limited Access.

Where the enclosure is located in a space above a ceiling, all of the following shall apply:

(0) The enclosure shall be accessible through a lay-in-type ceiling or an access panel(s).

(0) The width of the working space shall be the width of the enclosure or a minimum of 762 mm (30in.), whichever is greater.

(0) All doors or hinged panels shall open to at least 90 degrees.

(0) The space in front of the enclosure shall comply with the depth requirements of Table110.26(A)(1) .

0. A horizontal ceiling T-bar shall be permitted in this space.

0. The work space shall be otherwise unobstructed to the floor




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CommitteeStatement:

First level subdivision 424.66(B) is deleted to correlate with new 110.26(A)(4) which now providesworkspace clearance requirements for all venues and equipment. The informational note isretained and it will reside in 424.66.



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(A) Disconnecting Means.

Generators other than cord-and-plug-connected portable shall have one or more disconnecting meansthat . Each disconnecting means shall simultaneously disconnect open all associated ungroundedconductors. Each disconnecting means shall be lockable in the open position in accordance with 110.25.




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Committee Statement

Committee Statement: Editorial corrections were made for correlation and clarity.

Second Revision No. 3619-NFPA 70-2015 [Section No. 445.18(A)]


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(D) Notification.

The disconnecting means shall be legibly marked in the field. A label with the marking shall be placed in aconspicuous location near the battery if a disconnecting means is not provided. The marking shall be ofsufficient durability to withstand the environment involved and shall include the following:

(1) Nominal battery voltage

(2) Maximum available fault short-circuit current derived from the stationary battery system

(3) Date the fault short-circuit current calculation was performed

The battery disconnecting means shall be marked in accordance with 110.16.

Informational Note No. 1: Battery equipment suppliers can provide information about short-circuitcurrent on any particular battery model.

Informational Note No. 2: The available fault- short-circuit current marking(s) addressed in480.7(D)(2) is related to required short-circuit current ratings of equipment. NFPA 70E-2015,Standard for Electrical Safety in the Workplace, provides assistance in determining the severity ofpotential exposure, planning safe work practices, and selecting personal protective equipment.




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Committee Statement

Committee Statement: Changed to correlate with revisions SR 3630.



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(A) General.

Locations shall be classified depending on the properties of the flammable gas, flammable liquid–produced vapor, combustible liquid–produced vapors, combustible dusts, or fibers/flyings that may couldbe present, and the likelihood that a flammable or combustible concentration or quantity is present. Eachroom, section, or area shall be considered individually in determining its classification. Where pyrophoricmaterials are the only materials used or handled, these locations are outside the scope of this article.

Informational Note No. 1: Through the exercise of ingenuity in the layout of electrical installationsfor hazardous (classified) locations, it is frequently possible to locate much of the equipment in areduced level of classification or in an unclassified location and, thus, to reduce the amount ofspecial equipment required.

Refrigerant machinery rooms containing that contain ammonia refrigeration systems that and areequipped with adequate mechanical ventilation that operates continuously or is initiated by a detectionsystem at that alarms at 1000 ppm may be classified as “unclassified” locations. Rooms and refrigeratedareas containing ammonia refrigeration systems that are equipped with adequate mechanical ventilationthat operates continuously or is initiated by a detection system that alarms at 1000 ppm may be aconcentration not exceeding 150 ppm shall be permitted to be classified as “unclassified” locations.

Informational Note No. 2: For further information regarding classification and ventilation of areasinvolving closed-circuit ammonia refrigeration systems , see ANSI/ASHRAE 15-2013, SafetyStandard for Refrigeration Systems, and ANSI/IIAR 2–2014, Standard for Safe Design of Closed-Circuit Ammonia Refrigeration Systems .




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CommitteeStatement:

The Correlating Committee has revised Informational Note No. 1. to clarify that the machineryrooms are equipped with ventilation, not the refrigeration system.



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(1) General.

In Class I, Division 1 locations, the wiring methods in (a) through (f) shall be permitted.

(a) Threaded rigid metal conduit or threaded steel intermediate metal conduit.

Exception: Type PVC conduit,Type RTRC conduit, and Type HDPE conduit shall be permitted whereencased in a concrete envelope a minimum of 50 mm (2 in.) thick and provided with not less than 600mm (24 in.) of cover measured from the top of the conduit to grade. The concrete encasement shall bepermitted to be omitted where subject to the provisions of 514.8, Exception No. 2, or515.8(A).Threaded rigid metal conduit or threaded steel intermediate metal conduit shall be used for the last 600mm (24 in.) of the underground run to emergence or to the point of connection to the abovegroundraceway. An equipment grounding conductor shall be included to provide for electrical continuity of theraceway system and for grounding of non–current-carrying metal parts.

(b) Type MI cable terminated with fittings listed for the location. Type MI cable shall be installed andsupported in a manner to avoid tensile stress at the termination fittings.

(c) In industrial establishments with restricted public access, where the conditions of maintenance andsupervision ensure that only qualified persons service the installation, Type MC-HL cable listed for use inClass I, Zone 1 or Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath, anoverall jacket of suitable polymeric material, and a separate equipment grounding conductor(s) inaccordance with 250.122, and terminated with fittings listed for the application.

Type MC-HL cable shall be installed in accordance with the provisions of Article 330, Part II.

(d) In industrial establishments with restricted public access, where the conditions of maintenance andsupervision ensure that only qualified persons service the installation, Type ITC-HL cable listed for use inClass I, Zone 1 or Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath and anoverall jacket of suitable polymeric material, and terminated with fittings listed for the application, andinstalled in accordance with the provisions of Article 727.

(e) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall bepermitted to be installed in raceways in accordance with 501.10(A). These optical fiber cables shall besealed in accordance with 501.15.

(f) In industrial establishments with restricted public access, where the conditions of maintenance andsupervision ensure that only qualified persons service the installation, for applications limited to 600 volts,nominal, or less, and where protected from damage by location or a suitable guard, listed Type TC-ER-HLcable with an overall jacket and a separate equipment grounding conductor(s) in accordance with250.122 that is terminated with fittings listed for the location. Type TC-ER-HL cables shall be installed inaccordance with the provisions of Article 336.10 , including the restrictions of 336.10(7) .




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Committee Statement

Committee New list item 501.10(A)(1)(f) has been removed for correlation as it conflicts with actions taken by


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Statement: CMP-7. A task group will be appointed comprising of members from CMP-7, CMP-14, and theCorrelating Committee to review language pertaining to hazardous (classified) locations. The taskgroup will focus on continuous correlation between hazardous location Articles and the remainder ofthe NEC and submit PIs and PCs as required.



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(2) Flexible Connections.

Where necessary to employ flexible connections, as at motor terminals, one of the following shall bepermitted:

(1) Flexible fittings listed for the location, or

(2) Flexible cord in accordance with the provisions of 501.140, terminated with cord connectors listed forthe location, or

(3) In industrial establishments with restricted public access, where the conditions of maintenance andsupervision ensure that only qualified persons service the installation, for applications limited to 600volts, nominal, or less, and where protected from damage by location or a suitable guard, listedType TC-ER-HL cable with an overall jacket and a separate equipment grounding conductor(s) inaccordance with 250.122 that is terminated with fittings listed for the location




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CommitteeStatement:

This revision is necessary to correlate with revisions in 501.10(A)(1) as modified by SCR -3for suitability.


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Second Correlating Revision No. 91-NFPA 70-2016 [ Section No. 501.105(A) [Excluding

any Sub-Sections] ]

In Class I, Division 1 locations, meters, instruments, and relays, including kilowatt-hour meters, instrumenttransformers, resistors, rectifiers, and thermionic tubes, shall comply with 501.105(A)(1) and (A)(2). beprovided with enclosures identified for Class I, Division 1 locations. Enclosures for Class I, Division 1locations include explosionproof enclosures and purged and pressurized enclosures.

Informational Note: See NFPA 496-2013, Standard for Purged and Pressurized Enclosures forElectrical Equipment .



SCR-91_501.105_A_.docx For staff use only




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Committee Statement

CommitteeStatement:

This language creates a correlation issue with the definition of attachment plug. Attachmentplugs are not permitted to be used with other than flexible cords.


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(1) Enclosures.

Enclosures that are identified for Class I, Division 1 locations shall be provided. Enclosures for Class I,Division 1 locations include explosionproof enclosures and purged and pressurized enclosures.

Informational Note: See NFPA 496 -2013, Standard for Purged and Pressurized Enclosures forElectrical Equipment .




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Committee Statement

CommitteeStatement:

This revision resolves a correlation issue with the definition of attachment plug. Attachmentplugs are not permitted to be used with other than flexible cords.


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(2) Connections.

To facilitate replacement in industrial establishments with restricted public access, where the conditionsof maintenance and supervision ensure that only qualified persons service the installation, and wherethe cable is not subject to physical damage, meters, instruments, and relays shall be permitted to beconnected through Type TC-ER-HL cable by means of attachment plugs and receptacles, provided thatall of the following conditions apply:

(0) Attachment plug and receptacle is listed for use in Class I, Division 1 locations and for use withTC-ER-HL cable.

(0) The attachment plug and receptacle is interlocked mechanically or electrically, or otherwisedesigned so that they cannot be separated when the contacts are energized and the contactscannot be energized when the plug and socket outlet are separated.

(0) Type TC-ER-HL cable is listed for use in Class I, Division 1 locations.

(0) Type TC-ER-HL cable is installed in accordance with the provisions of Article 336 , including therestrictions of 336.10(7) .

(0) Only necessary receptacles are provided.




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CommitteeStatement:


Second Revision No. 3925-NFPA 70-2015 [Section No. 501.105(A)(2)]


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(6) Connections.

To facilitate replacements, process control instruments shall be permitted to be connected through flexiblecord, listed Type TC-ER cable, or Type TC-ER-HL cable, by means of attachment plug and receptacle,provided that all of the following conditions apply:

(1) Attachment The attachment plug and receptacle are listed for use in Class I, Division 2 locations andfor use with flexible cords, Type TC-ER cable or Type TC-ER-HL cable as applicable, and shall be ofthe locking and grounding type.

Exception: A Class I, Division 2 listing is shall not be required if the circuit is nonincendive fieldwiring.

(2) Unless the attachment plug and receptacle are interlocked mechanically or electrically, or otherwisedesigned so that they cannot be separated when the contacts are energized and the contacts cannotbe energized when the plug and socket outlet are separated the following shall apply: , a switchcomplying with 501.105(B)(2) is provided so that the attachment plug or receptacle is not dependedon to interrupt current.

Exception: The switch is shall not be required if the circuit is nonincendive field wiring.

(3) The flexible cord does not exceed 900 mm (3 ft) and is of a type listed for extra-hard usage or forhard usage if protected by location, if applicable.

(3) Type TC-ER cable or Type TC-ER-HL cable is installed in accordance with the provisions of Article336 , including the restrictions of 336.10(7) , if applicable.


(4) Unless the attachment plug and receptacle are interlocked mechanically or electrically, or otherwisedesigned so that they cannot be separated when the contacts are energized and the contactscannot be energized when the plug and socket outlet are separated, the instrumentation receptaclecarries a label warning against plugging or unplugging under load.

(5) The circuit has a maximum current of 3 amps.




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CommitteeStatement:




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(B) Attachment Plugs.

Attachment plugs shall be of the type providing for connection to the equipment grounding conductor of apermitted flexible cord or cable and shall be identified for the location.




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CommitteeStatement:



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(B) Class II, Division 2.

In Class II, Division 2 locations, motors, generators, and other rotating electrical equipment shall be totallyenclosed nonventilated, totally enclosed pipe-ventilated, totally enclosed water-air-cooled, totally enclosedfan-cooled, or dust-ignitionproof, for which maximum full-load external temperature shall be in accordancewith 500.8(D)(2) for normal operation when operating in free air (not dust blanketed) and shall have noexternal openings.

Exception: If the authority having jurisdiction believes accumulations of nonconductive, nonabrasivedust will be moderate and if machines can be easily reached for routine cleaning and maintenance, thefollowing shall be permitted to be installed:

(1) Standard open-type machines without sliding contacts, centrifugal or other types of switchingmechanism (including motor overcurrent, overloading, and overtemperature devices), or integralresistance devices

(2) Standard open-type machines with such contacts, switching mechanisms, or resistance devicesenclosed within dusttight housings without ventilating or other openings

(3) Self-cleaning textile motors of the squirrel-cage type

(4) Machines with sealed bearings, bearing isolators, and seals




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CommitteeStatement:

The words "machines with" has been added to provide additional clarity for list item 4 asnoted in the affirmative ballot comments.



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505.2 Definitions.

Encapsulation “m”.

Type of protection where electrical parts that could ignite an explosive atmosphere by either sparking orheating are enclosed in a compound in such a way that this explosive atmosphere cannot be ignited.

Informational Note No. 1: See ANSI/ ISA-60079-18 (12.23.01)-2009 -2012 , Explosive atmospheres— Part 18: Equipment protection by encapsulation “m”; and ANSI/UL 60079-18-2009, Explosiveatmospheres — Part 18: Equipment protection by encapsulation “m.”

Informational Note No. 2: Encapsulation is designated type of protection “ma” for use in Zone 0locations. Encapsulation is designated type of protection “m” or “mb” for use in Zone 1 locations.Encapsulation is designated type of protection “mc” for use in Zone 2 locations.

Flameproof “d”.

Type of protection where the enclosure will withstand an internal explosion of a flammable mixture thathas penetrated into the interior, without suffering damage and without causing ignition, through any jointsor structural openings in the enclosure, of an external explosive gas atmosphere consisting of one ormore of the gases or vapors for which it is designed.

Informational Note: See ANSI/ISA-60079-1 (12.22.01)-2009 ISA-60079-1-2009 , ExplosiveAtmospheres, Part 1: Equipment protection by flameproof enclosures “d”; and ANSI/UL60079-1-2009, Electrical Apparatus for Explosive Gas Atmospheres — Part 1: FlameproofEnclosures “d.”

Increased Safety “e”.

Type of protection applied to electrical equipment that does not produce arcs or sparks in normal serviceand under specified abnormal conditions, in which additional measures are applied so as to giveincreased security against the possibility of excessive temperatures and of the occurrence of arcs andsparks.

Informational Note: See ANSI/ ISA-60079-7 (12.16.01)-2008 -2013 , Explosive Atmospheres —Part 7: Equipment protection by increased safety “e”; and ANSI/UL 60079-7–2008, ElectricalApparatus for Explosive Gas Atmospheres — Part 7: Increased Safety “e.”

Intrinsic Safety “i”.

Type of protection where any spark or thermal effect is incapable of causing ignition of a mixture offlammable or combustible material in air under prescribed test conditions.

Informational Note No. 1: See ANSI/ UL 913-2006 -2015 , Intrinsically Safe Apparatus andAssociated Apparatus for Use in Class I, II, and III, Division 1 Hazardous (Classified) Locations;ANSI/ ISA-60079-11 (12.02.01)-2011, Explosive Atmospheres — Part 11: Equipment protection byintrinsic safety “i”; and ANSI/UL 60079-11-2011, Explosive Atmospheres — Part 11: Equipmentprotection by intrinsic safety “i.”

Informational Note No. 2: Intrinsic safety is designated type of protection “ia” for use in Zone 0locations. Intrinsic safety is designated type of protection “ib” for use in Zone 1 locations. Intrinsicsafety is designated type of protection “ic” for use in Zone 2 locations.

Informational Note No. 3: Intrinsically safe associated apparatus, designated by [ia], [ib], or [ic], isconnected to intrinsically safe apparatus (“ia,” “ib,” or “ic,” respectively) but is located outside thehazardous (classified) location unless also protected by another type of protection (such asflameproof).


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Oil Immersion “o”.

Type of protection where electrical equipment is immersed in a protective liquid in such a way that anexplosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.

Informational Note: See ANSI/ISA-60079-6 (12.00.05) -2009, Explosive Atmospheres — Part 6:Equipment protection by oil immersion “o”; and ANSI/UL 60079-6-2009, Electrical Apparatus forExplosive Gas Atmospheres — Part 6: Oil-Immersion “o.”

Powder Filling “q”.

Type of protection where electrical parts capable of igniting an explosive atmosphere are fixed in positionand completely surrounded by filling material (glass or quartz powder) to prevent the ignition of anexternal explosive atmosphere.

Informational Note: See ANSI/ISA-60079-5 (12.00.04) -2009, Explosive Atmospheres — Part 5:Equipment protection by powder filling “q”; and ANSI/UL 60079-5-2009 , Electrical Apparatus forExplosive Gas Atmospheres — Part 5: Powder Filling Electrical Apparatus for Explosive GasAtmospheres — Part 5: Powder Filling “q.”

Pressurization “p”.

Type of protection for electrical equipment that uses the technique of guarding against the ingress of theexternal atmosphere, which may be explosive, into an enclosure by maintaining a protective gas therein ata pressure above that of the external atmosphere.

Informational Note: See ANSI/UL-60079-2-2015, Explosive Atmospheres — Part 2: Equipmentprotection by pressurized enclosures “p”; and IEC 60079-13-2010, Electrical apparatus forexplosive gas atmospheres — Part 13: Construction and use of rooms or buildings protected bypressurization.

Type of Protection “n”.

Type of protection where electrical equipment, in normal operation, is not capable of igniting a surroundingexplosive gas atmosphere and a fault capable of causing ignition is not likely to occur.

Informational Note: See ANSI/UL 60079-15-2009, Electrical Apparatus for Explosive GasAtmospheres — Part 15: Type of Protection “n”; and ANSI/ISA-60079-15 (12.12.02)-2009 -2012 ,Explosive Atmospheres — Part 15: Equipment protection by type of protection “n.”



SCR-7_505.2_Definitions.docx For staff use only




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Committee Statement

Committee Statement: The edition date has been added to the document reference for UL 60079-5.



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(A) Classification of Locations General .

Locations shall be classified depending on the properties of the flammable gases, flammable liquid–produced vapors, combustible liquid–produced vapors, combustible dusts, or fibers/flyings that may couldbe present and the likelihood that a flammable or combustible concentration or quantity is present. Eachroom, section, or area shall be considered individually in determining its classification. Where pyrophoricmaterials are the only materials used or handled, these locations are outside the scope of this article.

Informational Note No. 1: See 505.7 for restrictions on area classification.

Informational Note No. 2: Through the exercise of ingenuity in the layout of electrical installationsfor hazardous (classified) locations, it is frequently possible to locate much of the equipment inreduced level of classification or in an unclassified location and, thus, to reduce the amount ofspecial equipment required.

Refrigerant machinery rooms containing that contain ammonia refrigeration systems that and areequipped with adequate mechanical ventilation that operates continuously or is initiated by a detectionsystem that alarms at 1000 ppm may be classified as “unclassified” locations. Rooms and refrigeratedareas containing ammonia refrigeration systems that are equipped with adequate mechanical ventilationthat operates continuously or is initiated by a detection system that alarms at 1000 ppm may at aconcentration not exceeding 150 ppm shall be permitted to be classified as “unclassified” locations.

Informational Note: For further information regarding classification and ventilation of areas involvingclosed-circuit ammonia refrigeration systems , see ANSI/ASHRAE 15-2013, Safety Standard forRefrigeration Systems, and ANSI/IIAR 2-2014, Standard for Safe Design of Closed-CircuitAmmonia Refrigeration Systems .




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CommitteeStatement:

CHANGE TO MATCH OTHER SCR : Reword paragraph after Informational Note No. 1. Presentwording would indicate that ammonia systems are equipped with ventilation rather thanmachinery rooms.

The title to (A) was changed to "General" to correlate with 500.5(A).



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(1) Class I, Zone 0.

A Class I, Zone 0 location is a location in which one of the following conditions exists:

(1) Ignitible concentrations of flammable gases or vapors are present continuously, or

(2) Ignitible concentrations of flammable gases or vapors are present for long periods of time

Informational Note No. 1: As a guide in determining when flammable gases or vapors are presentcontinuously or for long periods of time, refer to ANSI/API RP 505-1997, Recommended Practicefor Classification of Locations for Electrical Installations of Petroleum Facilities Classified as ClassI, Zone 0, Zone 1 or Zone 2; ANSI/ISA-TR12.24.01-1998 (IEC 60079-10 Mod), RecommendedPractice for Classification of Locations for Electrical Installations Classified as Class I, Zone 0,Zone 1, or Zone 2 ; IEC 60079-10-1995, Electrical apparatus for explosive gas atmospheres,classifications of hazardous areas ANSI/ISA 60079-10-1-2014, Explosive Atmospheres — Part10-1: Classification of Areas — explosive gas atmospheres .; and Area Classification Code forPetroleum Installations, Model Code, Part 15 , Institute of Petroleum.

Informational Note No. 2: This classification includes locations inside vented tanks or vessels thatcontain volatile flammable liquids; inside inadequately vented spraying or coating enclosures wherevolatile flammable solvents are used; between the inner and outer roof sections of a floating rooftank containing volatile flammable liquids; inside open vessels, tanks, and pits containing volatileflammable liquids; the interior of an exhaust duct that is used to vent ignitible concentrations ofgases or vapors; and inside inadequately ventilated enclosures that contain normally ventinginstruments utilizing or analyzing flammable fluids and venting to the inside of the enclosures.




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CommitteeStatement:

The correlating committee has revised Note No. 1 to reflect the actions taken at the meetingas noted in the ballot comments.



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(1) General.

In Class I, Zone 1 locations, the wiring methods in 505.15(B)(1)(a)505.15(B)(1)(a)505.15(B)(1) through(B)(1)(i) shall be permitted.

(a) All wiring methods permitted by 505.15(A).

(b) In industrial establishments with restricted public access, where the conditions of maintenanceand supervision ensure that only qualified persons service the installation, and where the cable is notsubject to physical damage, Type MC-HL cable listed for use in Class I, Zone 1 or Division 1 locations,with a gas/vaportight continuous corrugated metallic sheath, an overall jacket of suitable polymericmaterial, and a separate equipment grounding conductor(s) in accordance with 250.122, and terminatedwith fittings listed for the application. Type MC-HL cable shall be installed in accordance with theprovisions of Article 330, Part II.

(c) In industrial establishments with restricted public access, where the conditions of maintenanceand supervision ensure that only qualified persons service the installation, and where the cable is notsubject to physical damage, Type ITC-HL cable listed for use in Class I, Zone 1 or Division 1 locations,with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymericmaterial, and terminated with fittings listed for the application. Type ITC-HL cable shall be installed inaccordance with the provisions of Article 727.

Informational Note: See 727.4 and 727.5 for restrictions on use of Type ITC cable.

(d) Type MI cable terminated with fittings listed for Class I, Zone 1 or Division 1 locations. Type MIcable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.

(e) Threaded rigid metal conduit, or threaded steel intermediate metal conduit.

(f) Type PVC conduit and Type RTRC conduit shall be permitted where encased in a concreteenvelope a minimum of 50 mm (2 in.) thick and provided with not less than 600 mm (24 in.) of covermeasured from the top of the conduit to grade. Threaded rigid metal conduit or threaded steelintermediate metal conduit shall be used for the last 600 mm (24 in.) of the underground run to emergenceor to the point of connection to the aboveground raceway. An equipment grounding conductor shall beincluded to provide for electrical continuity of the raceway system and for grounding of non–current-carrying metal parts.

(g) Intrinsic safety type of protection “ib” shall be permitted using the wiring methods specified inArticle 504.

Informational Note: For entry into enclosures required to be flameproof, explosionproof, or ofincreased safety, see the information on construction, testing, and marking of cables; flameproofand increased safety cable fittings; and flameproof and increased safety cord connectors inANSI/UL 2225-2011 -2013 , Cables and Cable-Fittings for Use in Hazardous (Classified) Locations.

(h) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall bepermitted to be installed in raceways in accordance with 505.15(B). Optical fiber cable shall be sealed inaccordance with 505.16.

Informational Note: For entry into enclosures required to be flameproof, explosionproof, or ofincreased safety, see the information on construction, testing, and marking of cables; flameproofand increased safety cable fittings; and flameproof and increased safety cord connectors inANSI/UL 2225-2011 -2013 , Cables and Cable-Fittings for Use in Hazardous (Classified) Locations.

(i) In industrial establishments with restricted public access, where the conditions of maintenanceand supervision ensure that only qualified persons service the installation, for applications limited to 600volts nominal or less, for cable diameters 25 mm (1 in.) or less, and where the cable is not subject tophysical damage, Type TC-ER-HL cable listed for use in Class I, Zone 1 locations, with an overall jacketand a separate equipment grounding conductor(s) in accordance with 250.122, and terminated withfittings listed for the location, Type TC-ER-HL cable shall be installed in accordance with the provisions ofArticle 336, including the restrictions of 336.10(7).


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CommitteeStatement:

505.15(B)(1)(i) has been reverted back to 2014 NEC text for correlation as it conflicts with actionstaken by CMP7. A task group will be appointed comprising of members from CMP-7, CMP-14, andthe Correlating Committee to review language pertaining to hazardous (classified) locations. Thetask group will focus on continuous correlation between hazardous location Articles and theremainder of the NEC and submit PIs and PCs as required. The task group will focus on continuouscorrelation between hazardous location Articles and the remainder of the NEC. Similar actions aretaken in 336.10(11).



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Second Correlating Revision No. 97-NFPA 70-2016 [ New Section after 505.17(A) ]

(B) Instrumentation Connections for Zone 2.

To facilitate replacements, process control instruments shall be permitted to be connected throughflexible cords, attachment plugs, and receptacles, provided that all of the following conditions apply:

(1) A switch listed for Zone 2 is provided so that the attachment plug is not depended on to interruptcurrent, unless the circuit is type “ia,” “ib,” or “ic” protection, in which case the switch is notrequired.

(2) The current does not exceed 3 amperes at 120 volts, nominal.

(3) The power-supply cord does not exceed 900 mm (3 ft), is of a type listed for extra-hard usage orfor hard usage if protected by location, and is supplied through an attachment plug and receptacleof the locking and grounding type.


(5) The receptacle carries a label warning against unplugging under load.




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(B) Power, Control, and Instrumentation Connections for Zone 1.

To facilitate replacement in industrial establishments with restricted public access, where the conditionsof maintenance and supervision ensure that only qualified persons service the installation, and wherethe cable is not subject to physical damage; power, control, and instrumentation shall be permitted to beconnected through Type TC-ER-HL cable, by means of attachment plugs and receptacles, provided thatall of the following conditions apply:

(0) Attachment plug and receptacle are listed for use in Class I, Zone 1 locations and for use withTC-ER-HL cable.

Exception: A Class I, Zone 1 listing is not required if the circuit type of protection is “ia” or “ib”.

(0) Unless the attachment plug and receptacle are interlocked mechanically or electrically, orotherwise designed so that they cannot be separated when the contacts are energized and thecontacts cannot be energized when the plug and socket outlet are separated, a switch listed forthe location is provided so that the attachment plug or receptacle is not depended on to interruptcurrent.

Exception: A switch is not required if the circuit type of protection is “ia” or “ib”.

(0) Type TC-ER-HL cable is listed for use in Class I, Zone 1 locations.

(0) Type TC-ER-HL cable is installed in accordance with the provisions of Article 336 , including therestrictions of 336.10(7) .


(0) Unless the attachment plug and receptacle are interlocked mechanically or electrically, orotherwise designed so that they cannot be separated when the contacts are energized and thecontacts cannot be energized when the plug and socket outlet are separated, the instrumentationreceptacle carries a label warning against plugging or unplugging under load.




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(C) Power, Control, and Instrumentation Connections for Zone 2.

To facilitate replacements, power, control and instrumentation shall be permitted to be connectedthrough flexible cords, listed Type TC-ER cable or Type TC-ER-HL cable, by means of attachmentplugs, and receptacles, provided that all of the following conditions apply:

(0) Attachment plug and receptacle are listed for use in Class I, Zone 2 locations and for use withflexible cords, Type TC-ER cable or Type TC-ER-HL cable, as applicable, and shall be of thelocking and grounding type.

Exception: A Class I, Zone 2 listing is not required if the circuit type of protection is “ia”, “ib”, or“ic”.

(0) Unless the attachment plug and receptacle are interlocked mechanically or electrically, orotherwise designed so that they cannot be separated when the contacts are energized and thecontacts cannot be energized when the plug and socket outlet are separated, a switch listed forthe location is provided so that the attachment plug or receptacle is not depended on to interruptcurrent.

Exception: A switch is not required if the circuit type of protection is “ia”, “ib”, or “ic”.

(0) The flexible cord does not exceed 900 mm (3 ft), is of a type listed for extra-hard usage or for hardusage if protected by location, if applicable.

(0) Type TC-ER cable or Type TC-ER-HL cable is installed in accordance with the provisions ofArticle 336 , including the restrictions of 336.10(7) , if applicable


(0) Unless the attachment plug and receptacle are interlocked mechanically or electrically, orotherwise designed so that they cannot be separated when the contacts are energized and thecontacts cannot be energized when the plug and socket outlet are separated, the instrumentationreceptacle carries a label warning against unplugging under load.




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(A) Group IIIC.

Combustible metal dust. Group IIIC is shall be considered to be equivalent to Class II, Group E asdescribed in 500.6(B)(1) .




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(B) Group IIIB.

Combustible dust other than combustible metal dust. Group IIIB is shall be considered to be equivalent toClass II, Groups F and G as described in 500.6(B)(2) and 500.6(B)(3) , respectively .




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Committee Statement: Revised in accordance with 90.5 of the NEC.



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(C) Group IIIA.

Solid particles, including fibers, greater than 500 µm in nominal size, which may could be suspended inair and could settle out of the atmosphere under their own weight. Group IIIA is shall be considered to beequivalent to Class III.

Informational Note No. 1: Group IIIA is equivalent to Class III.

Informational Note: Examples of flyings include rayon, cotton (including cotton linters and cottonwaste), sisal, jute, hemp, cocoa fiber, oakum, and baled waste kapok.




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515.3 Class I Locations.


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Table 515.3 shall be applied where Class I liquids are stored, handled, or dispensed and shall be used todelineate and classify bulk storage plants. The class location shall not extend beyond a floor, wall, roof, orother solid partition that has no communicating openings. [30:7.3, 7.4]

Informational Note No. 1: The area classifications listed in Table 515.3 are based on the premisethat the installation meets the applicable requirements of NFPA 30-2015, Flammable andCombustible Liquids Code, Chapter 5, in all respects. Should this not be the case, the authorityhaving jurisdiction has the authority to classify the extent of the classified space.

Informational Note No. 2: See 514.3(C) through (E) for gasoline dispensing stations in marinas andboatyards.

Table 515.3 Electrical Area Classifications

Location Division Zone Extent of Classified Area

Indoor equipment installed inaccordance with Section 7.3 ofNFPA 30 where flammablevapor–air mixtures can exist undernormal operation (seeInformational Note)

1 0

The entire area associated with suchequipment where flammable gases or vaporsare present continuously or for long periods oftime

1 1Area within 1.5 m (5 ft) of any edge of suchequipment, extending in all directions

2 2

Area between 1.5 m and 2.5 m (5 ft and 8 ft) ofany edge of such equipment, extending in alldirections; also, space up to 900 mm (3 ft)above floor or grade level within 1.5 m to 7.5 m(5 ft to 25 ft) horizontally from any edge of such

equipment1

Outdoor equipment of the typecovered in Section 7.3 of NFPA30 installed where flammablevapor–air mixtures can exist undernormal operation

1 0

The entire area associated with suchequipment where flammable gases or vaporsare present continuously or for long periods oftime

1 1Area within 900 mm (3 ft) of any edge of suchequipment, extending in all directions

2 2

Area between 900 mm (3 ft) and 2.5 m (8 ft) ofany edge of such equipment, extending in alldirections; also, space up to 900 mm (3 ft)above floor or grade level within 900 mm to 3.0m (3 ft to 10 ft) horizontally from any edge ofsuch equipment

Tank storage installations insidebuildings

1 1 All equipment located below grade level

2 2 Any equipment located at or above grade level

Tank — aboveground, fixed roof 1 0 Inside fixed roof tank

1 1

Area inside dike where dike height is greaterthan the distance from the tank to the dike formore than 50 percent of the tankcircumference

2 2Within 3.0 m (10 ft) from shell, ends, or roof oftank; also, area inside dike to level of top ofdike wall

1 0 Area inside of vent piping or opening

1 1Within 1.5 m (5 ft) of open end of vent,extending in all directions

2 2Area between 1.5 m and 3.0 m (5 ft and 10 ft)from open end of vent, extending in alldirections


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Tank — aboveground, floating roof

With fixed outer roof 1 0Area between the floating and fixed roofsections and within the shell

With no fixed outer roof 1 1Area above the floating roof and within theshell

Tank vault — interior 1 1Entire interior volume, if Class I liquids arestored within

Underground tank fill opening 1 1Any pit, box, or space below grade level, if anypart is within a Division 1 or 2, or Zone 1 or 2classified location

2 2

Up to 450 mm (18 in.) above grade level withina horizontal radius of 3.0 m (10 ft) from a loosefill connection, and within a horizontal radius of1.5 m (5 ft) from a tight fill connection

Vent — discharging upward 1 0 Area inside of vent piping or opening

1 1Within 900 mm (3 ft) of open end of vent,extending in all directions

2 2Area between 900 mm and 1.5 m (3 ft and 5 ft)of open end of vent, extending in all directions

Drum and container filling —outdoors or indoors

1 0 Area inside the drum or container

1 1Within 900 mm (3 ft) of vent and fill openings,extending in all directions

2 2

Area between 900 mm and 1.5 m (3 ft and 5 ft)from vent or fill opening, extending in alldirections; also, up to 450 mm (18 in.) abovefloor or grade level within a horizontal radius of3.0 m (10 ft) from vent or fill opening

Pumps, bleeders, withdrawalfittings

Indoor 2 2

Within 1.5 m (5 ft) of any edge of such devices,extending in all directions; also, up to 900 mm(3 ft) above floor or grade level within 7.5 m(25 ft) horizontally from any edge of suchdevices

Outdoor 2 2

Within 900 mm (3 ft) of any edge of suchdevices, extending in all directions. Also, up to450 mm (18 in.) above grade level within 3.0 m(10 ft) horizontally from any edge of suchdevices

Pits and sumps

Without mechanical ventilation 1 1Entire area within a pit or sump if any part iswithin a Division 1 or 2 or Zone 1 or 2classified location

With adequate mechanicalventilation

2 2Entire area within a pit or sump if any part iswithin a Division 1 or 2 or Zone 1 or 2classified location

Containing valves, fittings, orpiping, and not within a Division 1or 2 or Zone 1 or 2 classifiedlocation

2 2 Entire pit or sump

Drainage ditches, separators,impounding basins


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Outdoor 2 2

Area up to 450 mm (18 in.) above ditch,separator, or basin; also, area up to 450 mm(18 in.) above grade within 4.5 m (15 ft)horizontally from any edge

Indoor Same as pits and sumps

Tank vehicle and tank car2

Loading through open dome 1 0 Area inside of the tank

1 1Within 900 mm (3 ft) of edge of dome,extending in all directions

2 2Area between 900 mm and 4.5 m (3 ft and 15ft) from edge of dome, extending in alldirections

Loading through bottomconnections with atmosphericventing

1 0 Area inside of the tank

1 1Within 900 mm (3 ft) of point of venting toatmosphere, extending in all directions

2 2

Area between 900 mm and 4.5 m (3 ft and 15ft) from point of venting to atmosphere,extending in all directions; also, up to 450 mm(18 in.) above grade within a horizontal radiusof 3.0 m (10 ft) from point of loadingconnection

Loading through closed dome withatmospheric venting

1 1Within 900 mm (3 ft) of open end of vent,extending in all directions

2 2

Area between 900 mm and 4.5 m (3 ft and 15ft) from open end of vent, extending in alldirections; also, within 900 mm (3 ft) of edge ofdome, extending in all directions

Loading through closed dome withvapor control

2 2Within 900 mm (3 ft) of point of connection ofboth fill and vapor lines extending in alldirections

Bottom loading with vapor controlor any bottom unloading

2 2

Within 900 mm (3 ft) of point of connections,extending in all directions; also up to 450 mm(18 in.) above grade within a horizontal radiusof 3.0 m (10 ft) from point of connections

Storage and repair garage for tankvehicles

1 1 All pits or spaces below floor level

2 2Area up to 450 mm (18 in.) above floor orgrade level for entire storage or repair garage

Garages for other than tankvehicles

Ordinary Unclassified

If there is any opening to these rooms withinthe extent of an outdoor classified location, theentire room shall be classified the same as thearea classification at the point of the opening.

Outdoor drum storage Ordinary Unclassified

Inside rooms or storage lockersused for the storage of Class Iliquids

2 2 Entire room or locker

Indoor warehousing where there isno flammable liquid transfer

Ordinary Unclassified

If there is any opening to these rooms withinthe extent of an indoor classified location, theclassified location shall extend through theopening to the same extent as if the wall, curb,or partition did not exist.


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Office and rest rooms Ordinary Unclassified

If there is any opening to these rooms withinthe extent of an indoor classified location, theroom shall be classified the same as if the wall,curb, or partition did not exist.

Piers and wharves See Figure 515.3.

1The release of Class I liquids can generate vapors to the extent that the entire building, and possibly anarea surrounding it, should be considered a Class I, Division 2 or Zone 2 location.

2When classifying extent of area, consideration shall be given to the fact that tank cars or tank vehiclescan be spotted at varying points. Therefore, the extremities of the loading or unloading positions shall beused. [30:Table 7.3.3]

Informational Note: See Section 7.3 of NFPA 30 -2015, Flammable and Combustible LiquidsCode , for additional information.

Figure 515.3 Area Classification for a Marine Terminal Handling Flammable Liquids. [30:Figure29.3.22]




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CommitteeStatement:

The references to NFPA 30 were moved to an informational note to comply with 4.2 of the NECStyle Manual and to comply with direction received from the Standards Council to removemandatory references to other standards.



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517.13 Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Spaces.

Wiring in patient care spaces shall comply with 517.13(A) and (B).

(A) Wiring Methods.

All branch circuits serving patient care areas spaces shall be provided with an effective ground-faultcurrent path by installation in a metal raceway system or a cable having a metallic armor or sheathassembly. The metal raceway system, or metallic cable armor, or sheath assembly shall itself qualify asan equipment grounding conductor in accordance with 250.118.

(B) Insulated Equipment Grounding Conductor Conductors and Insulated Equipment Bonding Jumpers .

(1) General.

The following shall be directly connected to an insulated copper equipment grounding conductor that isgreen clearly identified along its entire length by green insulation and installed with the branch circuitconductors in the wiring methods as provided in 517.13(A):

(1) The grounding terminals of all receptacles other than isolated ground receptacles

(2) Where metal receptacle boxes are used, the performance of the connection between the receptaclegrounding terminal and the metal box shall be equivalent to the performance provided by copperwire no smaller than 12 AWG. [ 99: 6.3.2.2.2.4] Metal outlet boxes, metal device boxes, or metalenclosures

(3) All non–current-carrying conductive surfaces of fixed electrical equipment likely to become energizedthat are subject to personal contact, operating at over 100 volts

Exception No. 1: An For other than isolated ground receptacles, an insulated equipment bonding jumperthat directly connects to the equipment grounding conductor is permitted to connect the box andreceptacle(s) to the equipment grounding conductor. Isolated ground receptacles shall be connected inaccordance with 517.16 .

Exception No. 2: Metal faceplates shall be permitted to be connected to the equipment groundingconductor by means of a metal mounting screw(s) securing the faceplate to a grounded outlet box orgrounded wiring device.

Exception No. 3: Luminaires more than 2.3 m (71⁄2 ft) above the floor and switches located outside of thepatient care vicinity shall be permitted to be connected to an equipment grounding return path complyingwith 517.13(A)and or (B).

(2) Sizing.

Equipment grounding conductors and equipment bonding jumpers shall be sized in accordance with250.122.




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CommitteeStatement:

Section 517.13(B)(2) has been reverted back to previous text for clarity. SR 4216 did nottechnically change the previous requirement. sizing is an installation criteria and the reference to"equivalent to the performance" would create confusion to installers and enforcers.



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517.30 Sources of Power.

(A) Two Independent Power Sources.

Essential electrical systems shall have a minimum of the following two independent sources of power: anormal source generally supplying the entire electrical system and one or more alternate source(s) foruse when the normal source is interrupted. [99:6.4.1.1.4]

(B) Types of Power Sources.

(1) Generating Units.

Where the normal source consists of generating units on the premises, the alternate source shall be eitheranother generating set or an external utility service. [99:6.4.1.1.5]

(2) Fuel Cell Systems.

Fuel cell systems shall be permitted to serve as the alternate source for all or part of an essential electricalsystem, provided the following conditions apply:

(1) Installation of fuel cells shall comply with the requirements in Parts I through VII of Article 692 for1000 volts or less and Part VIII for over 1000 volts.

Informational Note: For information on installation of stationary fuel cells, see NFPA853 -2015, Standard for Installation of Stationary Fuel Cell Power Systems . [ 99: 6.4.1.1.7]

(2) N + 1 units shall be provided where N units have sufficient capacity to supply the demand loads ofthe portion of the system served. [ 99: 6.4.1.7.2]

(3) System shall be able to assume loads within 10 seconds of loss of normal power source.

(4) System shall have a continuing source of fuel supply, together with sufficient on-site fuel storage forthe essential system type.

(5) A connection shall be provided for a portable diesel generator to supply life safety and criticalportions of the distribution system. [99:6.4.1.1.7(1) through (5) 6.4.1.1.7.5(1) through (5) ]

(6) Fuel cell systems shall be listed for emergency system use.

(C) Location of Essential Electrical System Components.

Essential electrical system components shall be located to minimize interruptions caused by natural forcescommon to the area (e.g., storms, floods, earthquakes, or hazards created by adjoining structures oractivities). Installations of electrical services shall be located to reduce possible interruption of normalelectrical services resulting from similar causes as well as possible disruption of normal electrical servicedue to internal wiring and equipment failures. Feeders shall be located to provide physical separation ofthe feeders of the alternate source and from the feeders of the normal electrical source to preventpossible simultaneous interruption.

Informational Note: Facilities in which the normal source of power is supplied by two or moreseparate central station-fed services experience greater than normal electrical service reliabilitythan those with only a single feed. Such a dual source of normal power consists of two or moreelectrical services fed from separate generator sets or a utility distribution network that has multiplepower input sources and is arranged to provide mechanical and electrical separation so that a faultbetween the facility and the generating sources is not likely to cause an interruption of more thanone of the facility service feeders.





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Committee Statement

CommitteeStatement:

The text has been reworded to remove the mandatory reference to NFPA 853 in accordance with4.2 of the NEC Style Manual and direction from the Standards Council to remove mandatoryreferences to other standards. "N1" was changed to "N+1" to correlate with NFPA 99.



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520.9 Branch Circuits.

A branch circuit of any size supplying one or more receptacles shall be permitted to supply stage setlighting. The voltage rating of the receptacles shall be not less than the circuit voltage. Receptacle ampereratings and branch-circuit conductor ampacity shall be not less than the branch-circuit overcurrent deviceampere rating. Table 210.21(B)(2) and Section 210.23 shall not apply. The application of 210.8(B)(4)shall not be required.




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Committee Statement

CommitteeStatement:

The reference to 210.8(B)(3)(d) has been changed to 210.8(B)(3)(4) based on the panelstatement in SR 4203 that referenced 210.8(B)(3)(4) for GFCI protection of outdoor receptacles.The word "optional" was replaced to correct permissive language in accordance with 90.5.



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525.23 Ground-Fault Circuit-Interrupter (GFCI) Protection.

Where GFCI protection is provided through the use of GFCI receptacles, and the branch circuitssupplying receptacles utilize flexible cord, the receptacles shall be identified for portable use.

(A) Where GFCI Protection Is Required.

GFCI protection for personnel shall be provided for the following:

(1) All 125-volt, single-phase, 15- and 20-ampere non-locking-type receptacles used for disassemblyand reassembly or readily accessible to the general public

(2) Equipment that is readily accessible to the general public and supplied from a 125-volt, single-phase,15- or 20-ampere branch circuit

The GFCI shall be permitted to be an integral part of the attachment plug or located in the power-supplycord within 300 mm (12 in.) of the attachment plug. Listed cord sets incorporating GFCI for personnel shallbe permitted.

(B) Where GFCI Protection Is Not Required.

Receptacles that are not accessible from grade level and that only facilitate quick disconnecting andreconnecting of electrical equipment shall not be required to be provided with GFCI protection. Thesereceptacles shall be of the locking type.

(C) Where GFCI Protection Is Not Permitted.

Egress lighting shall not be protected by a GFCI.

(D) Receptacles Supplied by Portable Cords.

Where GFCI protection is provided through the use of GFCI receptacles, and the branch circuitssupplying receptacles utilize flexible cord, the GFCI protection shall be listed, labeled, and identified forportable use.


Submitter Full Name: Sonia Barbosa

Organization: [ Not Specified ]

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Submittal Date: Tue Mar 08 13:30:54 EST 2016

Committee Statement

CommitteeStatement:

The text was added during the FR stage by CMP-15. CCN 162 directed to TC to comply with thestyle manual. The CC noted that the added text was not properly located as parent text.

The TC developed SR 4208 and relocated the text, with editorial revisions as a new 525.23(D)and title. The TC statement clearly relocates the text at the direction of the CC. They recognized itwas not properly located as parent text.

SR-4208-NFPA 70-2015


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(A) Rating.

Plugs and receptacles, including cord connectors and flanged surface devices, shall be rated in amperes.The voltage rating of the plugs and receptacles shall not be not less than the nominal circuit voltage. Plugand receptacle ampere ratings for ac circuits shall not be less than the feeder or branch-circuit overcurrentdevice ampere rating. Table 210.21(B)(2) and Section 406.15 shall not apply.




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Committee Statement: Revision made to correct grammar in accordance with the NEC Style Manual.



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530.23 Branch Circuits.

A branch circuit of any size supplying one or more receptacles shall be permitted to supply stage setlighting loads.

The application of 210.8(B)(4) shall not be required.




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Committee Statement: Revision made to correct grammar in accordance with the NEC Style Manual.



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Second Correlating Revision No. 18-NFPA 70-2016 [ Sections 551.72(C), 551.72(D) ]

(C) Receptacles.

Receptacles rated at 50 amperes shall be supplied from a branch circuit of the voltage class and rating ofthe receptacle. Other recreational vehicle sites with 125-volt, 20- and 30-ampere receptacles shall bepermitted to be derived from any grounded distribution system that supplies 120-volt, single-phase power.The neutral conductors shall not be reduced in size below the size of the ungrounded conductors for thesite distribution.

(D) Neutral Conductors.

Neutral conductors shall be permitted to be reduced in size below the minimum required size of theungrounded conductors for 240-volt, line-to-line, permanently connected loads only.

Informational Note: Due to the long circuit lengths typical in most recreational vehicle parks, feederconductor sizes found in the ampacity tables of Article 310 may be inadequate to maintain thevoltage regulation suggested in 215.2(A)(1) Informational Note No. 2. Total circuit voltage drop is asum of the voltage drops of each serial circuit segment, where the load for each segment iscalculated using the load that segment sees and the demand factors shown in Table 551.73(A).

Informational Note No. 2: The requirements to size wire at 125 percent of maximum load of210.19(A)(1) and 215.2(A)(1) (branch circuits and feeder circuits) do not apply to RV site supplycircuits as they are not continuous loads.




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Committee Statement

CommitteeStatement:

Removing the word regulation for Informational Note No. 1 more adequately described thevoltage drop info provided in 215.2(A)(1) Information Note No. 2. Informational Note No. 2 isdeleted; Informational Notes are not permitted to contain requirements.

Committee Comment No. 5410-NFPA 70-2015 [Sections 551.72(C), 551.72(D)]


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Second Correlating Revision No. 20-NFPA 70-2016 [ New Section after 555.23 ]

555.24 Signage.

Permanent safety signs shall be installed to give notice of electrical shock hazard risks to persons usingor swimming near a boat dock or marina and shall comply with all of the following:

(1) The signage shall comply with 110.21(B)(1) and be of sufficient durability to withstand theenvironment.

(2) The signs shall be clearly visible from all approaches to a marina or boatyard facility.

(3) The signs shall state “WARNING — POTENTIAL SHOCK HAZARD — ELECTRICALCURRENTS MAY BE PRESENT IN THE WATER.”




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Committee Statement

CommitteeStatement:

Section 555.24 has been rewritten to comply with the NEC Style Manual with new parent textand list items. The term "adequate" has been removed as it is vague and unenforceable.

Committee Comment No. 5411-NFPA 70-2015 [New Section after 555.23]


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(1) At Point of Entry to a Sign.

The disconnect shall be located at the point the feeder circuit or branch circuit(s) supplying a sign oroutline lighting system enters a sign enclosure, a sign body, or a pole in accordance with 600.5(C)(3)and . The disconnect shall disconnect open all ungrounded conductors where it enters the enclosure ofthe sign or pole.

Exception No. 1: A disconnect shall not be required for branch circuit(s) or feeder circuits conductor(s)passing through the sign where enclosed in a Chapter 3 listed raceway or metal-jacketed cableidentified for the location .

Exception No. 2: A disconnect shall not be required at the point of entry to a sign enclosure or sign bodyfor feeders or branch circuits branch circuit(s) or feeder conductor(s) that supply an internalpanelboard(s) in a sign enclosure or sign body. The conductors shall be enclosed in a Chapter 3 listedraceway or metal-jacketed cable identified for the location . A field-applied permanent warning label thatis visible during servicing shall be applied to the raceway at or near the point of entry into the signenclosure or sign body. The warning label shall comply with 110.21(B) and state the following: “Danger.This raceway contains energized conductors. Do not open. ” The marking shall include the location ofthe disconnecting means for the energized feeders or branch circuit(s) conductor(s) . The disconnectingmeans shall be capable of being locked in the open position in compliance accordance with 110.25.




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Committee Statement: The text is revised for grammatical reasons.

Second Revision No. 5127-NFPA 70-2015 [Section No. 600.6(A)(1)]


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(B) Guards.

Live parts of the electrical equipment are suitably guarded to the requirements of 110.27(A) , isolated, orinsulated, so as to remove reduce the likelihood of inadvertent contact between a qualified person in theworking space and live voltage with live parts operating at voltages greater than 30 volts ac rms, 42 voltsac peak, or 60 volts dc, and the equipment can be examined, adjusted, serviced, or maintained whileenergized without removal of this protection.




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Committee Statement: This revision is made for clarity and is not technical in nature.



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620.24 Branch Circuit for Hoistway Pit Lighting and Receptacle(s) Receptacles .

(A) Separate Branch Circuit Circuits .

Separate branch circuit(s) circuits shall supply the hoistway pit lighting and receptacle(s) receptacles .

Required lighting shall not be connected to the load side of a ground-fault circuit interrupter.

(B) Lighting Switch.

The lighting switch shall be so located as to be readily accessible from the pit access door.

(C) Duplex Receptacle.

At least one 125-volt, single-phase, 15- or 20-ampere duplex receptacle shall be provided in the hoistwaypit.

Informational Note No. 1: See ASME A17.1-2010 2013 /CSA B44-10 13 , Safety Code for Elevatorsand Escalators, for illumination levels.

Informational Note No. 2: See 620.85 for ground-fault circuit-interrupter requirements.




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CommitteeStatement:

Revised to clarify this requirement and replaces the “(s)” with “s” in the locations used tocomply with 3.3.3 of the NEC Style Manual.



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625.1 Scope.

This article covers the electrical conductors and equipment external to an electric vehicle that connect anelectric vehicle to a supply of electricity by conductive, inductive, or wireless power transfer (contactlessinductive charging) means, and the installation of equipment and devices related to electric vehiclecharging.

Informational Note No. 1: For industrial trucks, see NFPA 505-2013, Fire Safety Standard forPowered Industrial Trucks Including Type Designations, Areas of Use, Conversions, Maintenance,and Operation.

Informational Note No. 2: UL 2594-2013, Standard for Electric Vehicle Supply Equipment, is asafety standard for conductive electric vehicle supply equipment. UL 2202-2009, Standard forElectric Vehicle Charging System Equipment, is a safety standard for conductive electric vehiclecharging equipment.

Informational Note No. 3: UL 2750, Wireless Charging Equipment for Electric Vehicles .




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Committee Statement: Informational Note No. 3 is deleted as UL 2750 does not exist.



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625.16 Means of Coupling.

The means of coupling to the electric vehicle shall be conductive, inductive, or wireless power transfer.Attachment plugs, electric vehicle connectors, and electric vehicle inlets shall be listed or labeled for thepurpose.




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CommitteeStatement:

The second sentence has been restored to correlate with the Correlating Committee GlobalRevision regarding listing and labeling.



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625.102 Construction.

(A) Type.

The charger power converter, where integral to the primary pad, shall comply with 625.102(C). Thecharger power converter, if not integral to the primary pad, shall be provided with a suitable enclosurerating minimum Type 3R and shall be mounted in one of the following forms:

(0) Pedestal

(0) Wall or pole mounted

(0) Raised concrete pad

enclosure rating.

(B) Mounting Height Installation .

If the charger power converter is not integral to the primary pad, it shall be mounted at a height of not lessthan 450 mm (18 in.) above the floor level for indoor locations or 600 mm (24 in.) above grade level foroutdoor locations. The charger power converter shall be mounted in one of the following forms:

(1) Pedestal

(2) Wall or pole

(3) Building or structure

(4) Raised concrete pad

(C) Primary Pad.

The primary pad shall be installed on the surface, embedded in the surface of the floor with its top flushwith the surface, or embedded in the surface of the floor with its top below the surface. This includesprimary pad constructions with the charger power converter located in the primary pad enclosure.

(1) If the primary pad is located in an area requiring snow removal, it shall not be located on or abovethe surface.

Exception: Where installed on private property where snow removal is done manually, the primarypad shall be permitted to be located on or above the surface.

(2) The enclosure shall be provided with a suitable enclosure rating minimum Type 3. If the primary padis located in an area subject to severe climatic conditions (e.g., flooding), it shall be suitably rated forthose conditions or be provided with a suitably rated enclosure.

(D) Protection of the Output Cable.

The output cable to the primary pad shall be secured in place over its entire length for the purpose ofrestricting its movement and to prevent strain at the connection points. If installed in conditions wheredrive-over could occur, the cable shall be provided with supplemental protection. Where the chargerpower converter is a part of the primary pad assembly, the power supply cord to the primary pad shall alsobe protected.

(E) Other Wiring Systems.

Other wiring systems and fittings specifically listed for use on the WPTE shall be permitted.




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Committee Statement: Revised for editorial correction.



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645.1 Scope.

This article covers equipment, power-supply wiring, equipment interconnecting wiring, and grounding ofinformation technology equipment and systems in an information technology equipment room.

Informational Note: For further information, see NFPA 75-2013 2017 , Standard for the FireProtection of Information Technology Equipment, which covers the requirements for the protectionof information technology equipment and information technology equipment areas.




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CommitteeStatement:

Scope statements are the responsibility and the Correlating Committee has revised toaccurately reflect what the article covers. The scope now remains as is in the 2014 Code.



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Second Correlating Revision No. 81-NFPA 70-2016 [ Section No. 645.5(F) ]

(F) Securing in Place.

Power cables; communications cables, connecting cables, interconnecting cables, and associated boxes,connectors, plugs, and receptacles that are listed as part of, or for, information technology equipment shallnot be required to be secured in place where installed under raised floors.

Informational Note: Securement requirements for raceways and cables not listed as part of, or for,information technology equipment are found in 300.11 .




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Committee Statement

Committee Statement: Editorial revision.

Second Revision No. 3313-NFPA 70-2015 [Section No. 645.5(F)]


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Second Correlating Revision No. 79-NFPA 70-2016 [ Section No. 646.3(H) ]

(H) Storage Batteries.

Installation of storage batteries shall comply with Article 480.

Exception: Batteries that are part of listed and labeled equipment and installed in accordance with thelisting requirements. shall not be required to be installed in compliance with Article 480 .



SCR-79_646.3_H_.docx For staff use only




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Committee Statement

CommitteeStatement:

Revision made to remove the reference to the article scope; as that was incorrect. Text hasbeen reverted back to the 2014 text for clarity.

Committee Comment No. 3323-NFPA 70-2015 [Section No. 646.3(H)]


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Second Correlating Revision No. 43-NFPA 70-2016 [ New Section after 680.13 ]

680.14 Corrosive Environment.

(A) General.

Areas where pool sanitation chemicals are stored, as well as areas with circulation pumps, automaticchlorinators, filters, open areas under decks adjacent to or abutting the pool structure, and similarlocations shall be considered to be a corrosive environment. The air in such areas shall be consideredto be laden with acid, chlorine, and bromine vapors, or any combination of acid, chlorine, or brominevapors, and any liquids or condensation in those areas shall be considered to be laden with acids,chlorine, and bromine vapors, or any combination of acid, chlorine, or bromine vapors.

(B) Wiring Methods.

Wiring methods in the areas described in 680.14(A) shall be listed and identified for use in such areas.Rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit, and reinforcedthermosetting resin conduit shall be considered to be resistant to the corrosive environment specified in680.14(A) .




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Committee Statement

CommitteeStatement:

Revised to "and similar locations" to be more descriptive and clear. The use of "and/or" is to beavoided as indicated in Annex B of hte NEC Style Manual. In (B) the change was made tocomplywith 90.5 of the NEC.

Second Revision No. 4817-NFPA 70-2015 [New Section after 680.13]


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(1) Wiring Methods.

Where branch-circuit wiring on the supply side of enclosures and junction boxes connected to conduitsrun to underwater luminaires are subject to physical damage and/or are installed in wet, damp, orcorrosive environments as described in 680.14 , the wiring method of that portion of the branch circuitshall be installed using rigid metal conduit, intermediate metal conduit, as required in 680.14(B) or shallbe liquidtight flexible nonmetallic conduit, rigid polyvinyl chloride conduit, or reinforced thermosettingresin conduit suitable for the location. Where installed in dry, noncorrosive environments, branch circuitsshall comply with the general requirements in Chapter 3 . Wiring methods installed in wet, damp, orcorrosive environments as described in 680.14 shall contain an insulated copper equipment groundingconductor sized in accordance with Table 250.122, but not less smaller than 12 AWG shall be required .

Where installed in noncorrosive environments, branch circuits shall comply with the general requirementsin Chapter 3 .

Exception: Where connecting to transformers or power supplies for pool lights, liquidtight flexible metalconduit shall be permitted. The length shall not exceed 1.8 m (6 ft) for any one length or exceed 3.0 m(10 ft) in total length used.




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Committee Statement

Committee Statement: The exception is revised to address comments in balloting and for correlation and clarity.

Second Revision No. 4828-NFPA 70-2015 [Section No. 680.23(F)(1)]


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Second Correlating Revision No. 62-NFPA 70-2016 [ Section No. 690.7 [Excluding any

Sub-Sections] ]

The maximum voltage of PV system dc conductors circuits shall be the highest voltage between any twocircuit conductors or any conductor and ground. PV system dc circuits on or in one- and two-familydwellings shall be permitted to have a maximum voltage of 600 volts or less. PV system dcconductors circuits on or in other types of buildings shall be permitted to have a maximum voltage of 1000volts or less. Where not located on or in buildings, listed dc PV equipment, rated at a maximum voltage of1500 volts or less, shall not be required to comply with Parts II and III of Article 490 .




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CommitteeStatement:

This editorial revision improves clarity and complies with the style manual with regard to 4.1.1(references to an entire article).

Second Revision No. 935-NFPA 70-2015 [Section No. 690.7 [Excluding any Sub-Sections]]


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(A) Photovoltaic Source and Output Circuits.


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In a dc PV source circuit or output circuit, the maximum PV system voltage for that circuit shall becalculated in accordance with one of the following methods:

Informational Note: One source for lowest-expected, ambient temperature design data for variouslocations is the chapter titled Extreme Annual Mean Minimum Design Dry Bulb Temperature foundin the ASHRAE Handbook — Fundamentals, 2013. These temperature data can be used tocalculate maximum voltage.

(1) Instructions in listing or labeling of the module: The sum of the PV module– rated open-circuitvoltage of the series- connected modules corrected for the lowest expected ambient temperatureusing the open-circuit voltage temperature coefficients in accordance with the instructions included inthe listing or labeling of the module

(2) Crystalline and multicrystalline modules: For crystalline and multicrystalline silicon modules, the sumof the PV module– rated open-circuit voltage of the series- connected modules corrected for thelowest expected ambient temperature using the correction factor provided in Table 690.7(A)

Informational Note: One source for statistically valid, lowest-expected, ambient temperaturedesign data for various locations is the chapter titled Extreme Annual Mean Minimum DesignDry Bulb Temperature found in the ASHRAE Handbook — Fundamentals , 2009. Thesetemperature data can be used to calculate maximum voltage using the manufacturer’stemperature coefficients relative to the rating temperature of 25°C.

(3) PV systems of 100 kW or larger: For PV systems with a generating capacity of 100 kilowatts kW orgreater, an industry standard method shall be permitted to be used under engineering supervision adocumented and stamped PV system design, using an industry standard method and provided by alicensed professional electrical engineer, shall be permitted .

Informational Note: One industry standard method for calculating maximum voltage of a PVsystem is published by Sandia National Laboratories, reference SAND 2004-3535,Photovoltaic Array Performance Model.

Maximum voltage shall be corrected using one of the three following methods to calculate the modulevoltage:

(0) The open-circuit voltage temperature coefficients module voltage in accordance with theinstructions included in the listing of the module.

(0) For crystalline and multicrystalline silicon modules, the correction factors provided in Table690.7(A) shall be permitted to be used.

(0) For PV systems with a generating capacity of 100 kilowatts or greater, alternate methods shall bepermitted to be used under engineering supervision.

Informational Note: A method is published by Sandia National Laboratories, reference SAND2004-3535, Photovoltaic Array Performance Model .

The maximum voltage shall be used to determine the voltage rating of conductors, cables, disconnects,overcurrent devices, and other equipment.

Table 690.7(A) Voltage Correction Factors for Crystalline and Multicrystalline Silicon Modules

Correction Factors for Ambient Temperatures Below 25°C (77°F). (Multiply the rated open- circuitvoltage by the appropriate correction factor shown below.)

Ambient Temperature (°C) Factor Ambient Temperature (°F)

24 to 20 1.02 76 to 68

19 to 15 1.04 67 to 59

14 to 10 1.06 58 to 50

9 to 5 1.08 49 to 41

4 to 0 1.10 40 to 32

–1 to –5 1.12 31 to 23

–6 to –10 1.14 22 to 14

–11 to –15 1.16 13 to 5


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Correction Factors for Ambient Temperatures Below 25°C (77°F). (Multiply the rated open- circuitvoltage by the appropriate correction factor shown below.)

Ambient Temperature (°C) Factor Ambient Temperature (°F)

–16 to –20 1.18 4 to –4

–21 to –25 1.20 –5 to –13

–26 to –30 1.21 –14 to –22

–31 to –35 1.23 –23 to –31

–36 to –40 1.25 –32 to –40




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Committee Statement

CommitteeStatement:

It is not within the scope of the NEC to determine on the validity of a statistical analysis.

Text in (3) was reworded for improved clarity and titles were added to (1) through (3) to complywith 2.1.5.2 of the NEC Style Manual.



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(B) DC-to-DC Converter Source and Output Circuits.

In a dc-to-dc converter source and output circuit, the maximum voltage shall be calculated in accordancewith 690.7(B)(1) 690.7(B)(1)690.7(B) or (B) (2).

(1) Single DC-to-DC Converter.

For circuits connected to the output of a single dc-to-dc converter, the maximum voltage shall be themaximum rated voltage output of the dc-to-dc converter.

(2) Two or More Series Connected DC-to-DC Converters.

For circuits connected to the output of two or more series-connected dc-to-dc converters, the maximumvoltage shall be determined in accordance with the instructions included in the listing or labeling of thedc-to-dc converter. If these instructions do not state the rated voltage of series-connected dc-to-dcconverters, the maximum voltage shall be the sum of the maximum rated voltage output of the dc-to-dcconverters in series.




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CommitteeStatement:

Titles were added to (B)(1) and (2) to comply with the NEC Style Manual. In (2) “dc-to-dc”was added for consistency.



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(1) Photovoltaic Source Circuit Currents.

The maximum current shall be calculated by one of the following methods:

(1) The sum of parallel-connected PV module–rated short-circuit currents multiplied by 125 percent

(2) For PV systems with a generating capacity of 100 kilowatts kW or greater, a documented andstamped PV system design, using an industry standard method, performed under engineeringsupervision, that accounts for the maximum current variables of elevation, array orientation, andirradiance. The calculated maximum and provided by a licensed professional electrical engineer,shall be permitted. The calculated maximum current value shall be based on the highest 3-hourcurrent average resulting from the simulated local irradiance on the PV array accounting forelevation and orientation. The current value used by this method shall not be less than 70 percent ofthe value calculated using 690.8(A)(1) (a) 690.8(A)(1)(1) .

Informational Note: One industry standard method for calculating maximum current of a PV systemis available from Sandia National Laboratories, reference SAND 2004-3535, Photovoltaic ArrayPerformance Model. This model is used by the System Advisor Model simulation program providedby the National Renewable Energy Laboratory.




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Committee Statement

Committee Statement: The first sentence in (2) was reworded for clarity.



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(B) Conductor Ampacity.

PV system currents shall be considered to be continuous. Circuit conductors shall be sized to carry notless than the larger of 690.8(B)(1) or (B) (2) or where protected by a listed adjustable electronicovercurrent protective device in accordance 690.9(B)(3) , not less than the current in 690.8(B)(3) .

(1) Before Application of Adjustment and Correction Factors.

One hundred and twenty-five percent of the maximum currents calculated in 690.8(A) before theapplication of adjustment and correction factors.

Exception: Circuits containing an assembly, together with its overcurrent device(s), that is listed forcontinuous operation at 100 percent of its rating shall be permitted to be used at 100 percent of itsrating.

(2) After Application of Adjustment and Correction Factors.

The maximum currents calculated in 690.8(A) after the application of adjustment and correction factors.

(3) Adjustable Electronic Overcurrent Protective Device.

The rating or setting of an adjustable electronic overcurrent protective device installed in accordancewith 240.6




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Committee Statement

Committee Statement: The text was reworded for improved clarity and to comply with the NEC Style Manual.

Committee Comment No. 940-NFPA 70-2015 [Section No. 690.8(B)]


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(A) Circuits and Equipment.

PV system dc circuit and inverter output conductors and equipment shall be protected against overcurrent.Overcurrent protection protective devices are shall not be required for circuits with sufficient ampacity forthe highest available current. Circuits connected to current limited supplies (e.g., PV modules, dc-to-dcconverters, interactive inverter output circuits) and also connected to sources having higher currentavailability (e.g., parallel strings of modules, utility power) shall be protected at the higher current sourceconnection.

Exception: An overcurrent device shall not be required for PV modules or PV source circuit or dc-to-dcconverters source circuit conductors sized in accordance with 690.8(B) where one of the followingapplies:

(1) There are no external sources such as parallel-connected source circuits, batteries, or backfeedfrom inverters.

(2) The short-circuit currents from all sources do not exceed the ampacity of the conductors and themaximum overcurrent protective device size rating specified for the PV module or dc-to-dcconverter.

Informational Note: Photovoltaic system dc circuits are current limited circuits that only needovercurrent protection when connected in parallel to higher current sources. Where necessary,the The overcurrent device is often installed at the higher current source end of the circuit.




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Committee Statement

CommitteeStatement:

The second sentence in (A) was revised for NEC Style for consistency with 90.5(B). The lastsentence in the Informational Note was changed from mandatory text to informative text.



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690.10 Stand-Alone Systems.

The premises wiring system shall be adequate to meet the requirements of this Code for a similarinstallation connected to a service. The wiring on the supply side of the building or structuredisconnecting means shall comply with the requirements of this Code , except as modified by 690.10(A)through (D). stand-alone system shall be installed in accordance with 710.15 .

(A) Inverter Output.

The ac output from a stand-alone inverter(s) shall be permitted to supply ac power to the building orstructure disconnecting means at current levels less than the calculated load connected to thatdisconnect. The inverter output rating or the rating of an alternate energy source shall be equal to orgreater than the load posed by the largest single utilization equipment connected to the system.Calculated general lighting loads shall not be considered as a single load.

(B) Sizing and Protection.

The circuit conductors between the inverter output and the building or structure disconnecting meansshall be sized based on the output rating of the inverter. These conductors shall be protected fromovercurrents in accordance with Article 240 . The overcurrent protection shall be located at the outputof the inverter.

(C) Single 120-Volt Supply.

The inverter output of a stand-alone solar PV system shall be permitted to supply 120 volts to single-phase, 3-wire, 120/240-volt service equipment or distribution panels where there are no 240-volt outletsand where there are no multiwire branch circuits. In all installations, the rating of the overcurrent deviceconnected to the output of the inverter shall be less than the rating of the neutral bus in the serviceequipment. This equipment shall be marked with the following words or equivalent:

WARNING

SINGLE 120-VOLT SUPPLY. DO NOT CONNECT

MULTIWIRE BRANCH CIRCUITS!

The warning sign(s) or label(s) shall comply with 110.21(B) .

(D) Back-Fed Circuit Breakers.

Plug-in type back-fed circuit breakers connected to the stand-alone output of a stand-alone inverter ormultimode inverter shall be secured in accordance with 408.36(D) . Circuit breakers marked “line” and“load” shall not be back-fed.




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Committee Statement

CommitteeStatement:

Because the reference to the full Article 710 is in violation of the NEC Style Manual, the textwas changed to reference appropriate requirements in 710.15.


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690.12 Rapid Shutdown of PV Systems on Buildings.

PV system circuits installed on or in buildings shall include a rapid shutdown function to reduce shockhazard for emergency responders in accordance with 690.12(A) through (E D ).

Exception: Ground mounted PV system circuits that enter buildings, of which the sole purpose is tohouse PV system equipment, shall not be required to comply with 690.12 .

(A) Controlled Conductors.

Requirements for controlled conductors shall apply to PV system dc circuits and inverter output circuitssupplied by the PV system. PV system dc circuits shall be controlled from all sources of supply, includingenergy storage or other dc power sources, as applicable. PV inverter output circuits shall only be requiredto be controlled from the PV source.

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(B) Controlled Limits.

The use of the term array boundary in this section is defined as 30 cm 305 mm (1 ft) from the array in alldirections. Controlled conductors shall apply to outside the array boundary shall comply with 690.12(B)(1)and inside the array boundary shall comply with 690.12(B)(2) .

(1) Outside the Array Boundary.

Controlled conductors located outside the boundary or more than 1 m (3 ft) from the point of entry insidea building shall be limited to not more than 30 volts within 10 30 seconds of rapid shutdown initiation.Voltage shall be measured between any two conductors and between any conductor and ground.

(2) Inside the Array Boundary.

Controlled conductors located inside the boundary or less than 1 m (3 ft) from the point of entry inside abuilding shall be limited to not more than 80 volts within 10 seconds of rapid shutdown initiation. Voltageshall be measured between any two conductors and between any conductor and ground. Thisrequirement shall become effective January 1, 2018, The PV system shall comply with one of thefollowing:

) The PV array shall be listed or field labeled as a rapid shutdown PV array. Such a PV array shall beinstalled and used in accordance with the instructions included with the rapid shutdown PV array listing orfield labeling.

Informational Note: A listed or field labeled rapid shutdown PV array is evaluated as an assemblyor system as defined in the installation instructions to reduce but not eliminate risk of electricshock hazard within a damaged PV array during fire-fighting procedures. These rapid shutdownPV arrays are designed to reduce shock hazards by methods such as limiting access to energizedcomponents, reducing the voltage difference between energized components, limiting the electriccurrent that might flow in an electrical circuit involving personnel with increased resistance of theconductive circuit, or by a combination of such methods.

) Controlled conductors located inside the boundary or not more than 1 m (3 ft) from the point ofpenetration of the surface of the building shall be limited to not more than 80 volts within 30 seconds ofrapid shutdown initiation. Voltage shall be measured between any two conductors and between anyconductor and ground.

) PV arrays with no exposed wiring methods, no exposed conductive parts, and installed more than 2.5 m(8 ft) from exposed grounded conductive parts or ground shall not be required to comply with690.12(B)(2) .

The requirement of 690.12(B)(2) shall become effective January 1, 2019.


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(C) Initiation Device.

Where multiple PV systems are installed on a single service, a single device The initiation device(s) shallinitiate the rapid shutdown function of all the PV systems on that service system . Additional auxiliaryinitiation devices operating in accordance with rapid shutdown equipment listings shall be permitted. Thedevice “off” position shall indicate that the rapid shutdown function has been initiated for all PV systemsconnected to that device. For one-family and two-family dwellings, an initiation device(s) shall be locatedat a readily accessible location outside the building.

The rapid shutdown initiation device device(s) shall comply with consist of at least one of the following:

(1) Where the PV system is connected in accordance with 705.12(D) and rapid shutdown initiatesupon loss of voltage from the utility, the service disconnecting means shall be the initiation device.Service disconnecting means

(2) Where the PV system is connected in accordance with 705.12(A) and rapid shutdown initiatesupon loss of voltage from the utility, the PV system disconnecting means shall be the initiationdevice. PV system disconnecting means

(3) Where rapid shutdown does not initiate upon loss of voltage from the utility, the initiation device shallbe readily accessible and clearly indicate whether the PV system is “off” or “on.” The initiation deviceshall be lockable in the “off” position. Readily accessible switch that plainly indicates whether it is inthe “off” or “on” position

Informational Note: One example of why an initiation device that complies with 690.12(C)(3)would apply to, for example, be used is where a PV system with standby operation whereconductors are not controlled upon loss of voltage from the utility. is connected to an optionalstandby system that remains energized upon loss of utility voltage.

Where multiple PV systems are installed with rapid shutdown functions on a single service, the initiationdevice(s) shall consist of not more than six switches or six sets of circuit breakers, or a combination of notmore than six switches and sets of circuit breakers, mounted in a single enclosure, or in a group ofseparate enclosures. These initiation device(s) shall initiate the rapid shutdown of all PV systems withrapid shutdown functions on that service. Where auxiliary initiation devices are installed, these auxiliarydevices shall control all PV systems with rapid shutdown functions on that service.

(D) Manually Reset.

When the rapid shutdown system is manually initiated the PV system shall not reset without manualintervention.

Global SCR-119

(D) Equipment.

Equipment that performs the rapid shutdown functions, other than initiation devices such as listeddisconnect switches, circuit breakers, or control switches, shall be listed , and identified for providingrapid shutdown protection.

Informational Note: Inverter input circuit conductors often remain energized for up to 5 minuteswith inverters not listed for rapid shutdown.

(E) Marking.

(1)

The rapid shutdown initiation device shall have a sign complying with 690.56 located on or no morethan 1 meter (3 ft) from the device that includes the following wording:

RAPID SHUTDOWN PV SYSTEM DISCONNECT

(2)

If a rapid shutdown initiation device is not located near the service disconnecting means, a sign shall beinstalled at the service disconnecting means location, identifying the location of the initiation device.

Exception: Ground mounted PV system circuits that enter buildings or structures, of which the solepurpose is to house PV power generating equipment, are not required to comply with 690.12 .


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Committee Statement

CommitteeStatement:

These changes are made to comply with 90.5(A) and 3.1.1 of the NEC Style Manual. Thechange in (C) was made to improve clarity.



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(F) Type of Disconnect.

(1) Simultaneous Disconnection.

The PV system disconnecting means shall simultaneously disconnect the PV system conductors of thecircuit from all conductors of other wiring systems. The PV system disconnecting means shall be anexternally operable general-use switch or circuit breaker, or other approved means. A dc PV systemdisconnecting means shall be marked for use in PV systems or be suitable for backfeed operation.

(2) Devices Marked “Line” and “Load.”

Devices marked with “line” and “load” shall not be permitted for backfeed or reverse current.

(3) DC-Rated Enclosed Switches, Open-Type Switches, and Low-Voltage Power Circuit Breakers.

DC-rated, enclosed switches, open-type switches, and low-voltage power circuit breakers shall bepermitted for backfeed operation.




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Committee Statement

Committee Statement: Revisions made to remove the mandatory text in the Informational Note.

Second Revision No. 949-NFPA 70-2015 [Section No. 690.13(F)]


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(A) Location.

Isolating devices or equipment disconnecting means shall be installed in circuits connected to equipmentat a location within the equipment, or within sight and within 10 feet 3 m (10 ft) of the equipment. Anequipment disconnecting means shall be permitted to be remote from the equipment where the equipmentdisconnecting means can be remotely operated from within 10 feet 3 m (10 ft) of the equipment.




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Committee Statement

CommitteeStatement:

Disconnecting means is a defined term and a contactor does not fit that criteria. Revisions madefor correlation with the definition of disconnecting means. Using a contactor as a disconnectingmeans presents significant safety concerns.



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(D) Equipment Disconnecting Means.

An equipment disconnecting means shall simultaneously disconnect all current-carrying conductors thatare not solidly grounded of the circuit to which it is connected. An equipment disconnecting means shallbe externally operable without exposing the operator to contact with live energized parts, and shallindicate whether in the open (off) or closed (on) position, and shall be lockable in accordance with110.25 . An equipment disconnecting means shall be one of the following devices:

(1) A manually operable switch or circuit breaker

(2) A connector meeting the requirements of 690.33(E)(1)

(3) A load break fused pull out switch

(4) A remote controlled circuit breaker, contactor, or relay that is operable locally and opensautomatically when control power is interrupted

Informational Note: Devices marked with “line” and “load” are not suitable for backfeed or reversecurrent. Dc-rated enclosed switches, open-type switches, and low-voltage power circuit breakersare suitable for backfeed operation.

For equipment disconnecting means, other than those complying with 690.33 , where the line and loadterminals may can be energized in the open position, the device shall be marked in accordance with thefollowing words or equivalent: warning in 690.13(B) .

WARNING

ELECTRIC SHOCK HAZARD

TERMINALS ON THE LINE AND LOAD SIDES MAY BE ENERGIZED IN THE OPEN POSITION

The warning sign(s) or label(s) shall comply with 110.21(B) .

Exception: Connectors that meet 690.33 are exempt from this marking requirement.




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Committee Statement

CommitteeStatement:

Revisions made for correlation with the definition of disconnecting means and with 110.25.Disconnecting means is a defined term and a contactor or relay does not fit that criteria. Using acontactor or relay as a disconnecting means presents significant safety concerns.



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(A) Buildings or Structures Supporting a PV System Array .

A building or structure supporting a PV system array shall have a grounding electrode system installed inaccordance with Part III of Article 250.

The PV system PV array equipment grounding conductors shall be connected to the grounding electrodesystem of the building or structure supporting the PV system by means of the grounding electrodeconductor, or the grounding bus of associated equipment connected to the grounding electrodeconductor array in accordance with Part VII of Article 250 . This connection shall be in addition to anyother equipment grounding conductor requirements in 690.43(C). The PV system array equipmentgrounding conductors shall be sized in accordance with 690.45.

For PV systems that are not solidly grounded, the equipment grounding conductor for the output of thePV system, connected to associated distribution equipment, shall be permitted to be the connection toground for ground-fault protection and equipment grounding of the PV array.

For solidly grounded PV systems, as permitted in 690.41(A)(5), the grounded conductor shall beconnected to a grounding electrode system with by means of a grounding electrode conductor sized inaccordance with 250.166.

Informational Note: Previous versions of this Code treated all grounded PV systems as solidlygrounded systems and therefore required a dc grounding electrode conductor to be connected togrounded PV system dc circuits. Since most PV systems installed in the past decade are notsolidly grounded, this Code narrows the requirement for a dc grounding electrode to only thosethat are actually solidly grounded in accordance with 690.41(A)(5) . All other PV system groundingconfigurations listed in 690.41(A) do not require a dc grounding electrode conductor. Most PVsystems installed in the past decade are actually functional grounded systems rather than solidlygrounded systems as defined in this Code . For functional grounded PV systems with aninteractive inverter output, the ac equipment grounding conductor is connected to associatedgrounded ac distribution equipment. This connection is often the connection to ground forground-fault protection and equipment grounding of the PV array.




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Committee Statement: Informational Note was modified to remove mandatory text.



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(C) Facilities Buildings with Rapid Shutdown.

Buildings or structures with both utility service and a PV system complying with 690.12 shall have apermanent plaque or directory that includes the following wording:

PHOTOVOLTAIC SYSTEM EQUIPPED WITH RAPID SHUTDOWN

The plaque or directory shall be reflective, with all letters capitalized and having a minimum height of 9.5mm ( 3 ⁄8 in.), in white on red background. The plaque or directory shall be located on, or no more than 1m (3 ft) from, the service disconnecting means to which the PV systems are connected, or in accordancewith 690.56(A) or (B), as applicable, and shall indicate the location of the rapid shutdown initiator if notat the same location.

Buildings with PV systems shall have permanent as described in 690.56(C)(1) through (C)(3).


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(1) Rapid Shutdown Type.


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The type of PV system rapid shutdown shall be labeled as described in 690.56(C)(1)(a) or (1)(b):

(a) For PV systems that shut down the array and conductors leaving the array:

SOLAR PV SYSTEM IS EQUIPPED WITH RAPID SHUTDOWN.

TURN RAPID SHUTDOWN SWITCH TO THE “OFF” POSITION TO SHUT DOWN PV SYSTEMAND REDUCE SHOCK HAZARD IN ARRAY.

The title “SOLAR PV SYSTEM IS EQUIPPED WITH RAPID SHUTDOWN” shall utilize capitalizedcharacters with a minimum height of 9.5 mm ( 3 ⁄8 in.) in black on yellow background, and theremaining characters shall be capitalized with a minimum height of 4.8 mm ( 3 ⁄16 in.) in black on whitebackground. [See Figure 690.56(C)(1)(a).]

(b) For PV systems that only shut down conductors leaving the array:

SOLAR PV SYSTEM IS EQUIPPED WITH RAPID SHUTDOWN

TURN RAPID SHUTDOWN SWITCH TO THE “OFF” POSITION TO SHUT DOWN

CONDUCTORS OUTSIDE THE ARRAY. CONDUCTORS IN ARRAY REMAIN

ENERGIZED IN SUNLIGHT.

The title “SOLAR PV SYSTEM IS EQUIPPED WITH RAPID SHUTDOWN” shall utilize capitalizedcharacters with a minimum height of 9.5 mm ( 3 ⁄8 in.) in white on red background, and the remainingcharacters shall be capitalized with a minimum height of 4.8 mm ( 3 ⁄16 in.) in black on whitebackground. [See Figure 690.56(C)(1)(b).]

Figure 690.56(C)(1)(a) Label for PV Systems that Shut Down the Array and the ConductorsLeaving the Array.

Figure 690.56(C)(1)(b) Label for PV Systems that Shut Down the Conductors Leaving the ArrayOnly.

The labels in 690.56(C)(1)(a) and (b) shall include a simple diagram of a building with a roof. Thediagram shall have sections in red to signify sections of the PV system that are not shut down when therapid shutdown switch is operated.


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The rapid shutdown label in 690.56(C)(1) shall be located on or no more than 1 m (3 ft) from theservice disconnecting means to which the PV systems are connected and shall indicate the location ofall identified rapid shutdown switches if not at the same location.

(2) Buildings with More Than One Rapid Shutdown Type.

For buildings that have PV systems with both rapid shutdown types or a PV system with a rapidshutdown type and a PV system with no rapid shutdown, a detailed plan view diagram of the roof shallbe provided showing each different PV system and a dotted line around areas that remain energizedafter the rapid shutdown switch is operated.

(3) Rapid Shutdown Switch.

A rapid shutdown switch shall have a label located on or no more than 1 m (3 ft) from the switch thatincludes the following wording:

RAPID SHUTDOWN SWITCH FOR SOLAR PV SYSTEM

The label shall be reflective, with all letters capitalized and having a minimum height of 9.5 mm ( 3 ⁄8in.), in white on red background.




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Committee Statement

CommitteeStatement:

The second sentence in the first paragraph below Figure 690.56(C)(1)(b) was changed tocomply with 90.5(A) and the NEC Style Manual.



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690.59 Connection to Other Sources.

PV systems connected to other sources shall be installed in accordance with Parts I and II of Article705 .




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Committee Statement

CommitteeStatement:

The text was modified so as not to reference an entire Article, thereby complying with theNEC Style Manual.

SR-972-NFPA 70-2015


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690.72 Self-Regulated PV Charge Control.

The PV source circuit shall be considered to comply with the requirements of 706.23 if:

(1) The PV source circuit is matched to the voltage rating and charge current requirements of theinterconnected battery cells and,

(2) The maximum charging current multiplied by 1 hour is less than 3 percent of the rated batterycapacity expressed in ampere-hours or as recommended by the battery manufacturer

(A) General.

Equipment shall be provided to control the charging process of the battery. Charge control shall not berequired where the design of the photovoltaic source circuit is matched to the voltage rating and chargecurrent requirements of the interconnected battery cells and the maximum charging current multiplied by1 hour is less than 3 percent of the rated battery capacity expressed in ampere-hours or asrecommended by the battery manufacturer.

All adjusting means for control of the charging process shall be accessible only to qualified persons.

Informational Note: Certain battery types such as valve-regulated lead acid or nickel cadmiumcan experience thermal failure when overcharged.

(A) Diversion Charge Controller.

(1) Sole Means of Regulating Charging.

A photovoltaic power system employing a diversion charge controller as the sole means of regulatingthe charging of a battery shall be equipped with a second independent means to prevent overchargingof the battery.

(2) Circuits with Direct-Current Diversion Charge Controller and Diversion Load.

Circuits containing a dc diversion charge controller and a dc diversion load shall comply with thefollowing:

(0) The current rating of the diversion load shall be less than or equal to the current rating of thediversion load charge controller. The voltage rating of the diversion load shall be greater than themaximum battery voltage. The power rating of the diversion load shall be at least 150 percent ofthe power rating of the photovoltaic array.

(0) The conductor ampacity and the rating of the overcurrent device for this circuit shall be at least150 percent of the maximum current rating of the diversion charge controller.

(3) PV Systems Using Utility-Interactive Inverters.

Photovoltaic power systems using utility-interactive inverters to control battery state-of-charge bydiverting excess power into the utility system shall comply with (1) and (2):

(0) These systems shall not be required to comply with 690.72(B)(2) . The charge regulation circuitsused shall comply with the requirements of 690.8 .

(0) These systems shall have a second, independent means of controlling the battery chargingprocess for use when the utility is not present or when the primary charge controller fails or isdisabled.


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(B) Buck/Boost Direct-Current Converters.

When buck/boost charge controllers and other dc power converters that increase or decrease the outputcurrent or output voltage with respect to the input current or input voltage are installed, the requirementsshall comply with 690.72(C)(1) and (C)(2).

(0) The ampacity of the conductors in output circuits shall be based on the maximum ratedcontinuous output current of the charge controller or converter for the selected output voltagerange.

(0) The voltage rating of the output circuits shall be based on the maximum voltage output of thecharge controller or converter for the selected output voltage range.




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Committee Statement

Committee Statement: The text was rewritten in the form of a requirement to comply with the NEC Style Manual.



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691.1 Scope.

This article covers the installation of large-scale PV electric supply stations operated for the sole purposeof providing electric supply to the utility transmission or distribution system with a generating capacity ofno less than 5000 kW, and not under exclusive utility control . Electric supply stations are locationscontaining the generating stations and substations, including their associated generator, storage battery,transformer, and switchgear areas.

Informational Note No. 1: Facilities covered by this article have specific design and safety featuresunique to large-scale PV facilities and are operated for the sole purpose of providing electricsupply to a system operated by a regulated utility for the transfer of electric energy .

Informational Note No. 2: Section 90.2(B)(5) includes information about utility-owned properties notcovered under this Code. For additional information on electric supply stations, see ANSI/IEEEC2-2012, National Electrical Safety Code.




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Committee Statement

CommitteeStatement:

Scope statements should not contain definitions so the definition of Electric Supply Stations ismoved to 691.2. The scope statement has been revised to clearly indicate the facilities are 5,000kW and larger with ties to power company systems. Moved explanatory material into anInformational Note.



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691.4 Special Requirements for Large-Scale PV Electric Supply Stations.

Large-scale PV electric supply stations shall be accessible only to authorized personnel and comply withthe following:

(1) Electrical circuits and equipment for large-scale PV electric supply stations are accessible only toqualified personnel needed for the maintenance and operation of the PV electric supply station shallbe maintained and operated only by qualified personnel .

Informational Note: Refer to NFPA 70E-2015, Standard for Electrical Safety in the Workplace,for electrical safety requirements.

(2) Access to PV electric supply stations is shall be restricted by fencing or other adequate means inaccordance with 110.31. Field- applied hazard markings shall be applied in accordance with110.21(B).

(3) The connection between the PV electric supply station and the utility transmission or distributionsystem system operated by a utility for the transfer of electrical energy is through shall be throughmedium- or high-voltage switch gear, substation, switch yard, or similar methods whose sole purposeis shall be to safely and effectively interconnect the two systems.

(4) The electrical loads within the PV electric supply station are shall only be used to power auxiliaryequipment for the generation of the PV power.

(5) Large-scale PV electric supply stations shall not be installed on buildings.




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Committee Statement

CommitteeStatement:

Mandatory text was inserted for consistency and to comply with 90.5(A). “PV electric” wasadded to improve clarity.



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692.1 Scope.

This article applies to the installation of fuel cell systems.

Note: These Some fuel cell systems may can be interactive with other electrical power productionsources or , are stand-alone, or both, and may or may not be . Some fuel cell systems areconnected to electric energy storage systems such as batteries. These Fuel cell systems may canhave ac and or output(s), dc output(s), or both for utilization.




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Committee Statement

CommitteeStatement:

The Scope Statement has been revised to include all the descriptive systems into anInformational Note



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(F) Temporary Source of Power for Maintenance or Repair of the Alternate Source of Power.


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If the emergency system relies on a single alternate source of power, which must will be disabled formaintenance or repair, the emergency system shall include permanent switching means to connect aportable or temporary alternate source of power, which shall be available for the duration of themaintenance or repair. The permanent switching means to connect a portable or temporary alternatesource of power shall comply with the following:

(1) Connection of to the portable or temporary alternate source of power shall not require disabling ofthe emergency system’s normal modification of the permanent system wiring .

(1) source of power or disconnection of the emergency system’s alternate source of power, other thanby the switching means.

(2) Any transfer Transfer of power between the normal power source and the emergency power sourceshall be in accordance with 700.12. It shall be permissible to utilize manual switching.

(3) The connection point for the portable or temporary alternate source shall be marked with the phaserotation and system bonding requirements.

(4) Mechanical or electrical interlocking shall prevent inadvertent interconnection of power sources.

(5) The switching means shall include an “emergency source disabled” contact for connection to acontact point that shall annunciate at a location remote from the generator remote annunciator orat another facility alarm data collection point monitoring system to indicate that the permanentemergency source is disconnected from the emergency system .

It shall be permissible to utilize manual switching to switch from the permanent source of power to theportable or temporary alternate source of power and to utilize the switching means for connection of aload bank.

Informational Note: There are many possible methods to achieve the requirements of 700.3(F) .See Figure 700.3(F) for one example.

Figure 700.3(F)

Exception: A The permanent switching means to temporarily connect an a portable or temporaryalternate source of power, for the duration of the maintenance or repair, shall not be required whereone any of the following conditions exists:

(1) All processes that rely on the emergency system source are capable of being disabled duringmaintenance or repair of the emergency source of power.

(2) The building or structure is unoccupied and fire suppression systems are fully functional and do notrequire an alternate power source.

(3) Other temporary means can be substituted for the emergency system.

(4) A permanent alternate emergency source, such as, but not limited to, a second on-site standbygenerator or separate electric utility service connection, capable of supporting the emergencysystem, exists.


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Committee Statement

CommitteeStatement:

Revised to move list item (2) to the end of the section for clarity. Revised list item (5) to clarifythe location of the notification.

Committee Comment No. 3602-NFPA 70-2015 [Section No. 700.3(F)]


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(A) Identification.

Emergency circuits shall be permanently marked so they will be readily identified as a component of anemergency circuit or system by the following methods:

(1) All boxes and enclosures (including transfer switches, generators, and power panels) for emergencycircuits shall be permanently marked so they will be readily as a component of an emergency circuitor system .

(2) Where boxes or enclosures are not encountered, exposed cable or raceway systems shall bepermanently marked to be identified as a component of an emergency circuit or system, at intervalsnot to exceed 7.6 m (25 ft) .

Receptacles supplied from the emergency system shall have a distinctive color or marking on thereceptacle cover plates or the receptacles themselves .




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Committee Statement

Committee Statement: The superfluous word “themselves” was deleted for clarity.



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705.22 Disconnect Device.

The disconnecting means for ungrounded conductors shall consist of a manually manual or poweroperable operated switch(es) or circuit breaker(s) that complies with the following features :

(1) Located where readily accessible

(2) Externally operable without exposing the operator to contact with live parts and, if poweroperable operated , of a type that could be is opened by hand in the event of a power-supply failure

(3) Plainly indicating indicate whether in the open (off) or closed (on) position

(4) Having Have ratings not less than the load to be carried and the fault current to be interrupted. Fordisconnect equipment energized from both sides, a marking shall be provided to indicate that allcontacts of the disconnect equipment might be energized. sufficient for the maximum circuit current,available short-circuit current, and voltage that is available at the terminals

(5) Where the line and load terminals are capable of being energized in the open position, marked inaccordance with the warning in 690.13(B)

Informational Note : In parallel generation systems, some equipment, including knife bladeswitches and fuses, is likely to be energized from both directions. See 240.40.

(6) Simultaneous Simultaneously disconnect of all ungrounded conductors of the circuit

(7) Capable of being locked Be lockable in the open (off) position in accordance with 110.25




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Committee Statement

Committee Statement: Minor clerical and grammatical changes were made to improve clarity.



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Second Correlating Revision No. 115-NFPA 70-2016 [ New Section after 705.65(B) ]

(C) Conductor Ampacity.

Power source output circuit conductors that are connected to a feeder, if smaller than the feederconductors, shall be sized to carry not less than the larger of the current as calculated in 705.60(B) oras calculated in accordance with 240.21(B) based on the over-current device protecting the feeder.




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Committee Statement

CommitteeStatement:

“Defined” is replaced with “calculated” because current is not “defined” in 705.60(B), but ratheris “calculated” in 705.60(B). “Where” is changed to “if” to comply with the NEC Style Manual.

Second Revision No. 1001-NFPA 70-2015 [New Section after 705.65(B)]


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Second Correlating Revision No. 116-NFPA 70-2016 [ Sections 705.150, 705.155,

705.160, 705.165, 705.170 ]

705.150 System Operation.

Interconnected electric power production sources Microgrid systems shall be permitted to disconnect fromthe primary source of power or other interconnected electric power production sources and operate as aseparate intentionally islanded or stand-alone microgrid system.

705.155 Disconnecting Means.

Stand-alone power sources shall be provided with a lockable disconnecting means and overcurrentprotection in accordance with 240.21 .

705.160 Primary Power Source Connection.

Connections to primary power sources that are external to the intentionally islanded or stand-alone microgrid system shall comply with the requirements of 705.12.

705.165 Reconnection to Primary Power Source.

Operating intentionally islanded or stand-alone Microgrid systems that reconnect to primary powersources shall be provided with the necessary equipment to establish a synchronous transition.

Global SCR-119

705.170 Island Interconnection Microgrid Interconnect Devices (IID) (MID).

Microgrid interconnect devices shall comply with the following:

) An IID shall be Be required for any connection between an intentionally islanded or stand-alone amicrogrid system and a primary power source.

) Interconnection devices shall be listed, Be listed or field labeled, as suitable for the intendedinterconnection application.

) Interconnection devices shall have Have sufficient number of overcurrent devices located so as toprovide overcurrent protection from all sources.

Informational Note: MID functionality is often incorporated in an interactive or multimode inverter,energy storage system, or similar device identified for interactive operation.




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Committee Statement

CommitteeStatement:

Adding MID to the title will provide the user of the Code with a reference to the phrase MicrogridInterconnect Device and the acronym MID. “May be” was changed to “is often” to remove arequirement from the Informational Note.

Second Revision No. 1000-NFPA 70-2015 [Sections 705.150, 705.155, 705.160, 705.165, 705.170]


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706.3 Other Articles.

Wherever the requirements of other articles of this Code and Article 706 differ, the requirements of Article706 shall apply. If the ESS is capable of being operated in parallel with a primary source(s) of electricity,the requirements in 705.6, 705.12 , 705.14, 705.16, 705.32, and 705.40 , 705.100, 705.143, and PartIV of Article 705 shall apply.




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Committee Statement

Committee Statement: Added a missing section reference as noted in balloting comments.



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(D) Notification.

The disconnecting means shall be legibly marked in the field. A label with the The marking shall beplaced in a conspicuous location near the ESS if a disconnecting means is not provided. The markingshall be of sufficient durability to withstand the environment involved meet the requirements of 110.21(B)and shall include the following:

(1) Nominal ESS voltage

(2) Maximum available fault short-circuit current derived from the ESS

(3) Arc flash risk assessment at the disconnecting means The associated clearing time or arc durationbased on the available short-circuit current from the ESS and associated overcurrent protectivedevices if applicable

(4) Date the calculation was performed

Exception: The labeling in 706.7(D)(1) through (D)(4) shall not be required if an arc flash label isapplied in accordance with acceptable industry practice.

Informational Note No. 1: Industry practices for equipment labeling are described in NFPA70E -2015, Standard for Electrical Safety in the Workplace . This standard provides specificcriteria for developing arc-flash labels for equipment that provides nominal system voltage, incidentenergy levels, arc-flash boundaries, minimum required levels of personal protective equipment,and so forth.

Informational Note No. 2: Battery equipment suppliers can provide information about short-circuitcurrent on any particular battery model.NFPA 70E -2015, Standard for Electrical Safety in theWorkplace , provides requirements for arc flash risk assessment.




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Committee Statement

Committee Statement: Revised to correlate with similar requirements in 110.16(B).



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Global SCR-119

(B) Identified Interactive Equipment.

Only inverters and ac modules listed and identified as interactive shall be permitted on interactivesystems.




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CommitteeStatement:

This revision was made to correlate with Correlating Committee Global Revision relating tolisting and labeled.

Committee Comment No. 3647-NFPA 70-2015 [Section No. 706.8(B)]


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(C) Charge controllers Controllers and DC-to-DC converters Converters .

When Where charge controllers and other dc DC-to-DC power converters that increase or decrease theoutput current or output voltage with respect to the input current or input voltage are installed, all of thefollowing shall apply:

(1) the The ampacity of the conductors in output circuits shall be based on the maximum ratedcontinuous output current of the charge controller or converter for the selected output voltage range,and .

(2) the The voltage rating of the output circuits shall be based on the maximum voltage output of thecharge controller or converter for the selected output voltage range.




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Committee Statement

Committee Statement: Revised for clarity and usability.



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Second Correlating Revision No. 25-NFPA 70-2016 [ New Section after 725.121(B) ]

(C) Marking.

The power sources for limited power circuits in 725.121(A)(3) and limited power circuits for listedaudio/video information technology (equipment) and listed industrial equipment in 725.121(A)(4) shallhave a label indicating the maximum voltage and current output for each connection point. The effectivedate shall be January 1, 2018.




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Committee Statement

Committee Statement: Revised to provide section heading as required by the NEC Style Manual.

Second Revision No. 610-NFPA 70-2015 [New Section after 725.121(B)]


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(2) In Buildings or Structures with Grounding Means.

If an intersystem bonding termination is established, 250.94(A) shall apply.

If the building or structure served has no intersystem bonding termination, the bonding conductor orgrounding electrode conductor shall be connected to the nearest accessible location on one of thefollowing:

(1) The building or structure grounding electrode system as covered in 250.50

(2) The grounded interior metal water piping system, within 1.5 m (5 ft) from its point of entrance to thebuilding, as covered in 250.52

(3) The power service accessible means external to enclosures using the options identified in theException of 250.94 . If an intersystem bonding termination is established, all the rules of 250.94apply 250.94(A) , Exception

(4) The nonflexible metallic power service raceway

(5) The service equipment enclosure

(6) The grounding electrode conductor or the grounding electrode conductor metal enclosure of thepower service, or

(7) The grounding electrode conductor or the grounding electrode of a building or structuredisconnecting means that is grounded to an electrode as covered in 250.32




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Committee Statement

CommitteeStatement:

Removed the phrase “all the rules of” for correlation between Articles 700, 800, 820 and830.



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Global SCR-119

770.179 Optical Fiber Cables.

Optical fiber cables shall be listed and identified in accordance with 770.179(A) through (F) and shall bemarked in accordance with Table 770.179. Optical fiber cables shall have a temperature rating of not lessthan 60°C (140°F). Temperature rating shall be marked on the jacket of optical fiber cables that have atemperature rating exceeding 60°C (140°F).

(A) Types OFNP and OFCP.

Types OFNP and OFCP nonconductive and conductive optical fiber plenum cables shall be listed asbeing suitable for use in ducts, plenums, and other space used for environmental air and shall also belisted as having have adequate fire resistan fire-resistan t and low smoke producing characteristics.

Informational Note: One method of defining a cable that is has adequate fire-resistant andlow-smoke producing cable and fire-resistant cable characteristics is that the cable exhibits amaximum peak optical density of 0.50 or less, an average optical density of 0.15 or less, and amaximum flame spread distance of 1.52 m (5 ft) or less when tested in accordance with NFPA262 -2015, Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use inAir-Handling Spaces .

(B) Types OFNR and OFCR.

Types OFNR and OFCR nonconductive and conductive optical fiber riser cables shall be listed as beingsuitable for use in a vertical run in a shaft or from floor to floor and shall also be listed as having havethe fire-resistant characteristics capable of preventing the carrying of fire from floor to floor.

Informational Note: One method of defining fire-resistant characteristics capable of preventingthe carrying of fire from floor to floor is that the cables pass the requirements of ANSI/UL1666-2011, Standard Test for Flame Propagation Height of Electrical and Optical-Fiber CableInstalled Vertically in Shafts .

(C) Types OFNG and OFCG.

Types OFNG and OFCG nonconductive and conductive general-purpose optical fiber cables shall belisted as being suitable for general-purpose use, with the exception of risers and plenums, and shall alsobe listed as being resistant to the spread of fire.

Informational Note: One method of defining resistant to the spread of fire is for the damage(char length) not to exceed 1.5 m (4 ft 11 in.) when performing the CSA vertical flame test —cables in cable trays, as described in CSA C22.2 No. 0.3-M-2001, Test Methods for ElectricalWires and Cables .


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(D) Types OFN and OFC.

Types OFN and OFC nonconductive and conductive optical fiber cables shall be listed as being suitablefor general-purpose use, with the exception of risers, plenums, and other spaces used for environmentalair, and shall also be listed as being resistant to the spread of fire.

Informational Note No. 1: One method of defining resistant to the spread of fire is that thecables do not spread fire to the top of the tray in the UL flame exposure, vertical tray flame test inANSI/UL 1685-2010, Standard for Safety for Vertical-Tray Fire-Propagation and Smoke-ReleaseTest for Electrical and Optical-Fiber Cables . The smoke measurements in the test method arenot applicable.

Another method of defining resistant to the spread of fire is for the damage (char length) not toexceed 1.5 m (4 ft 11 in.) when performing the CSA vertical flame test — cables in cable trays, asdescribed in CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables .

Informational Note No. 2: Cable types are listed in descending order of fire resistance rating.Within each fire resistance rating, nonconductive cable is listed first because it may substitute isoften substituted for the conductive cable.

Table 770.179 Cable Markings

Cable Marking Type

OFNP Nonconductive optical fiber plenum cable

OFCP Conductive optical fiber plenum cable

OFNR Nonconductive optical fiber riser cable

OFCR Conductive optical fiber riser cable

OFNG Nonconductive optical fiber general-purpose cable

OFCG Conductive optical fiber general-purpose cable

OFN Nonconductive optical fiber general-purpose cable

OFC Conductive optical fiber general-purpose cable

(E) Circuit Integrity (CI) Cable or Electrical Circuit Protective System.

Cables that are used for survivability of critical circuits under fire conditions shall be listed and meet either770.179(E)(1) or (E)(2).

Informational Note: The listing organization provides information for circuit integrity (CI) cable andelectrical circuit protective systems, including installation requirements necessary to maintain thefire rating.

(1) Circuit Integrity (CI) Cables.

Circuit integrity (CI) cables specified in 770.179(A) through (D), and used for survivability of criticalcircuits, shall have an additional classification using the suffix “CI.” In order to maintain its listed firerating, circuit integrity (CI) cable shall only be installed in free air.

Informational Note: One method of defining circuit integrity (CI) cable is by establishing aminimum 2-hour fire resistance rating for the cable when tested in accordance with ANSI/UL2196-2006, Standard for Tests of Fire-Resistive Cable .

(2) Fire-Resistive Cables.

Cables specified in 770.179(A) through (D) and 770.179(E)(1) that are part of an electrical circuitprotective system shall be fire-resistive cable and identified with the protective system number on theproduct or on the smallest unit container in which the product is packaged and installed in accordancewith the listing of the protective system.

Informational Note No. 1: One method of defining an electrical circuit protective system is byestablishing a minimum 2-hour fire resistance rating for the system when tested in accordancewith UL Subject 1724, Outline of Investigation for Fire Tests for Electrical Circuit ProtectiveSystems .

Informational Note No. 2: The listing organization provides information for electrical circuitprotective systems (FHIT), including installation requirements for maintaining the fire rating.


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(F) Field-Assembled Optical Fiber Cables.

Field-assembled optical fiber cable shall comply with 770.179(F)(1) through (4).

) The specific combination of jacket and optical fibers intended to be installed as a field-assembled opticalfiber cable shall be listed in accordance with one of the types in 770.179(A) , (B), or (D) and shall bemarked in accordance with Table 770.179 .

) The jacket of a field-assembled optical fiber cable shall have a surface marking indicating the specificoptical fibers with which it is listed identified for use.

) The optical fibers shall have a permanent marking, such as a marker tape, indicating the jacket withwhich they are listed identified for use.

) The jacket without fibers shall meet the listing requirements for communications raceways in800.182(A) , (B), or (C) in accordance with the cable marking.




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Committee Statement

CommitteeStatement:

Replaced the phrase “identified by” with the word “in” to eliminate any confusion regardingthe use of the term “identified.”



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(3) The power service accessible means external to enclosures using the options identified in theException of 250.94 . If an intersystem bonding termination is established, all the rules of 250.94shall apply 250.94(A) , Exception




(7) The grounding electrode conductor or the grounding electrode of a building or structuredisconnecting means that is grounded to an electrode as covered in 250.32

A bonding device intended to provide a termination point for the bonding conductor (intersystem bonding)shall not interfere with the opening of an equipment enclosure. A bonding device shall be mounted onnonremovable parts. A bonding device shall not be mounted on a door or cover even if the door or coveris nonremovable.

For purposes of this section, the mobile home service equipment or the mobile home disconnectingmeans, as described in 800.90(B), shall be considered accessible.




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CommitteeStatement:




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Second Correlating Revision No. 29-NFPA 70-2016 [ Section No. 800.113(J) ]

(J) Other Building Locations.

The following wires, cables, raceways, and cable routing assemblies shall be permitted to be installed inbuilding locations other than the locations covered in 800.113(B) through (I):

(1) Types CMP, CMR, CMG, and CM cables

(2) A maximum of 3 m (10 ft) of exposed Type CMX in nonconcealed spaces

(3) Plenum, riser, and general-purpose communications raceways

(4) Plenum, riser, and general-purpose cable routing assemblies

(5) Communications wires and Types CMP, CMR, CMG, and CM cables installed in:

a. Plenum communications raceways

b. Riser communications raceways

c. General-purpose communications raceways

(6) Types CMP, CMR, CMG, and CM cables installed in:

a. Plenum cable routing assemblies

b. Riser cable routing assemblies

c. General-purpose cable routing assemblies

(7) Communications wires and Types CMP, CMR, CMG, CM, and CMX cables installed in racewaysrecognized in Chapter 3

(8) Type CMUC under-carpet communications wires and cables installed under carpet or under floorcovering , modular tiles, and planks




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Committee Statement

CommitteeStatement:

Changed “modular flooring” back to “modular tiles” as used in Tables 800.154(A), (B), and (C) andArticle 725.135(K)(6). The changes made by Panel 16 from “modular tiles” to “modular flooring” isin conflict with the action of Panel 3, FR 621 in 725.135(K)(6).

Second Revision No. 4567-NFPA 70-2015 [Section No. 800.113(J)]


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Second Correlating Revision No. 33-NFPA 70-2016 [ Section No. 800.113(K) ]

(K) Multifamily Dwellings.

The following cables, raceways, and cable routing assemblies shall be permitted to be installed inmultifamily dwellings in locations other than the locations covered in 800.113(B) through (G):


(2) Type CMX cables less than 6 mm (0.25 in.) in diameter in nonconcealed spaces
















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CommitteeStatement:


Second Revision No. 4568-NFPA 70-2015 [Section No. 800.113(K)]


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Second Correlating Revision No. 34-NFPA 70-2016 [ Section No. 800.113(L) ]

(L) One- and Two-Family Dwellings.

The following cables, raceways, and cable routing assemblies shall be permitted to be installed in one-and two-family dwellings in locations other than the locations covered in 800.113(B) through 800.113(F):


(2) Type CMX cables less than 6 mm (0.25 in.) in diameter













(9) Hybrid power and communications cable listed in accordance with 800.179(I)




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CommitteeStatement:


Second Revision No. 4569-NFPA 70-2015 [Section No. 800.113(L)]


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810.6 Antenna Lead-In Protectors.

Where an antenna lead-in surge protector is installed, it shall be listed as being suitable for limiting surgeson the cable that connects the antenna to the receiver/transmitter electronics and shall be connectedbetween the conductors and the grounded shield or other ground connection. The antenna lead-inprotector shall be grounded using a bonding conductor or grounding electrode conductor installed inaccordance with 810.21(F).

Informational Note: For requirements covering protectors for antenna lead-in conductors, refer toUL Subject 497E, Outline of Investigation for Protectors for Antenna Lead-In Conductors.




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Committee Statement

Committee Statement: Revised the title of the UL document to its correct title.



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(3) The power service accessible means external to enclosures using the options identified in theException of 250.94. If an intersystem bonding termination is established, all the rules of 250.94shall apply 250.94(A) , Exception




(7) The grounding electrode conductor or the grounding electrode of a building or structuredisconnecting means that is connected to an electrode as covered in 250.32


For purposes of this section, the mobile home service equipment or the mobile home disconnectingmeans, as described in 820.93, shall be considered accessible.




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CommitteeStatement:




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(3) The power service accessible means external to enclosures using the options identified in theException of 250.94 . If an intersystem bonding termination is established, all the rules of 250.94shall apply 250.94(A) , Exception



(6) The grounding electrode conductor or the grounding electrode conductor metal enclosure of thepower service

(7) The grounding electrode conductor or the grounding electrode of a building or structuredisconnecting means that is connected to an electrode as covered in 250.32


For purposes of this section, the mobile home service equipment or the mobile home disconnectingmeans, as described in 830.93, shall be considered accessible.




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CommitteeStatement:




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Second Correlating Revision No. 37-NFPA 70-2016 [ Definition: With Required

Temperature Correction Factor ]

With Required Temperature Correction Factor.

If a 175-ampere service rating is selected, a service conductor is then

175 amperes × 0.83 = 145.25 amperes per 310.15(B)(7).

If the conductors are installed in an ambient temperature of 40°C (104°F), the conductor ampacity must bemultiplied by the appropriate correction factor in Table 310.15(B)(2)(a). In this case, we will use anXHHW-2 conductor, so we use a correction factor of 0.91 to find the minimum conductor ampacity andsize:

145.25/.91 = 159.6 amperes

In accordance with Table 310.15(B)(16), a 2/0 AWG Cu or a 4/0 AWG Al would be required.

If no temperature correction or ampacity adjustment factors are required, the following table includesconductor sizes calculated using the requirements in 310.15(B)(7). This table is based on 75°Cterminations and without any adjustment or correction factors.

Service or Feeder Rating (Amperes)Conductor (AWG or kcmil)

Copper Aluminum or Copper-Clad Aluminum

100 4 2

110 3 1

125 2 1/0

150 1 2/0

175 1/0 3/0

200 2/0 4/0

225 3/0 250

250 4/0 300

300 250 350

350 350 500

400 400 600




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Committee Statement

Committee Statement: The additional text is added for clarity and usability.


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Second Correlating Revision No. 119-NFPA 70-2016 [ … · Second Correlating Revision No. 119-NFPA...

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