Copyright 2005 Ted "Smitty" Smith Two Minute Drill Number Three Improving your skill in code Look Up...

Copyright 2005 Ted "Smitty" Smith

Two Minute Drill Number Three

Improving your skill in code Look Up Increasing Speed Drill


Directions

• Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide.

• Each slide will transition to the correct answer automatically in 2:00 minutes. The correct answer will transition in 15 seconds. As you progress through the slide show, the time for each question will be reduced.

• Write down the correct answer to each question and the code reference as it is displayed so you can review them later.

• Good luck


Equipment Use

• Luminaires marked suitable for Damp locations _______________ be used in a wet location.


Equipment Use

• cannot 410.4(A)


Equipment Use

• Metal poles used for the support of luminaires shall be bonded to a(n) ___________________.


Equipment use

• equipment grounding conductor 410.15(B)(5)


Equipment Use

• Water heaters having a capacity of __________________ gallons or less shall have a branch circuit rating not less than 125% of the nameplate rating of the water heater.


Equipment Use

• 120 422.13


Equipment Use

• Resistance type heating elements in electric space heating equipment shall be protected at not more than __________________.


Equipment Use

• 60A 424.22(B)


Equipment Use

• A heating panel is a complete assembly provided with a junction box or a length of flexible conduit for connection to a(n) __________________________.


Equipment Use

• branch circuit 424.91


Grounding

• Sheet metals screws shall not be used to connect grounding conductors or _______________ to enclosures as applied to grounding requirements.


Grounding

• connection devices 250.8


Grounding

• What is the minimum sized grounding electrode required for a service that is supplied by (4) parallel runs of 500 kCMIL service entrance conductors? The conductors are copper and the grounding electrode conductor will also be copper.


Grounding

• 3/0 Table 250.66


Grounding

• What is the minimum sized main bonding jumper that can be used for a service that is supplied by (4) parallel runs of 500 kCMIL service entrance conductors? The service entrance conductors are copper.


Grounding

• 250 kCMIL 250.28(D) and Table 8 for circular mills


Grounding

• What is the minimum sized equipment grounding conductor that is required for a circuit that is protected by a 50 ampere overcurrent protective device if the ungrounded conductors are increased in size from a number 6 AWG, THHN to a number 2 AWG, THHN? All conductors are copper.


Grounding

• 4 AWG 250.22(B) and Table 8 for circular mills


Grounding

• A junction box that is 18" x 18" x 6" that has two 1 1/2" EMT conduits entering and exiting through concentric knockouts and the conduits contain conductor that are number 4 AWG, THHN must be equipped with grounding bushings, threaded bosses or bonding lock nuts to accommodate the bonding and continuity requirements of article 250 of the NEC. The circuits in the junction box are operating at 208 volts, three-phase. True or False


Grounding

• False 250.96 and 250.97 would only be required if circuits were operating at more than 250 volts to ground.


Equipment Use

• An emergency system shall be suitable for the ___________________ available fault current at its terminals.


Equipment Use

• Maximum 700.5


Grounding

• When grounding the outer conductive shield of a coaxial cable the maximum sized ground required shall be ______________ AWG copper


Grounding

• 6 820.100(A)(3)


Feeders and Branch Circuits

• Class I power limited circuits are allowed to occupy the same cable, enclosure, or raceway as power supply circuits only where ________________________________.


Feeders and Branch Circuits

• The equipment powered is functionally associated

• 725.26(B)(1)


Equipment Use

• Fuel cell systems used as a source of power for legally required stand by systems shall be of suitable rating and capacity to supply and maintain the total load for not less than ____________ of full demand operation.


Equipment Use

• 2 hour


Equipment Use

• Where practicable a separation of at least _____________ meters shall be maintained between communications wires and cables on buildings and lightning conductors.


Equipment Use

• 1.8 800.53


Equipment Use

• The width of working space in front of the electric equipment shall be the width of the equipment or ____________mm (______ inches), whichever is greater. In all cases, the work space shall permit at least a 90 degree opening of the equipment doors or hinged panels. This question refers to 480 V equipment.


Equipment Use

• 750, 30 110.26(A)(2)


Equipment Use

• In all tunnels containing high-voltage mobile electric equipment the electrical controls for the ventilation system shall be arranged so that the airflow can be reversed. True or False


Equipment Use

• True 110.51(A) and 110.57


Equipment Use

• Switchboards and Panel boards that are likely to require examination, adjusting, servicing or maintenance while energized shall be field marked to warn qualified persons of potential _________________ hazards.


Equipment Use

• Arc Flash 110.16


Conductors and Cable Assemblies

• If the temperature limitations of equipment is not known and the equipment is rated at 100 amperes, then the ampacity of THHN wire connected to a 75 degree C circuit breaker must have the ampacity based upon the ________ degree C ampacity of the conductor sized used.



• 60C 110.14(C)(1)(a)(2)



• A 208V three-phase circuit is present in a junction box. A neutral conductor is also present in the junction box. The system is fed by a four wire, delta connected system. Can the standard Black, Red, Blue color coding be used on the ungrounded conductors in this case?


Conductor and Cable Assemblies

• No 110.15

Copyright 2005 Ted "Smitty" Smith Two Minute Drill Number Three Improving your skill in code Look Up...

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Transcript of Copyright 2005 Ted "Smitty" Smith Two Minute Drill Number Three Improving your skill in code Look Up...