Elec Standards
-
Upload
seshanramanujam -
Category
Documents
-
view
229 -
download
0
Transcript of Elec Standards
-
7/29/2019 Elec Standards
1/113
Electrical Standards
MODULE 10
-
7/29/2019 Elec Standards
2/113
2 2006 TEEX
Hazard Brainstorming
Where are electrical hazards on oil and
gas well sites?
-
7/29/2019 Elec Standards
3/113
3 2006 TEEX
Statistics
Electrocution: Among most frequent
causes of occupational injury death in
US 295 fatalities/year; 4309 lost time
1992-2002: 9% decrease
Most frequent cause: Overhead powerlines
-
7/29/2019 Elec Standards
4/113
4 2006 TEEX
Factors in Fatal Electrocutions
Safe work practices implemented and
followed?
Adequate/required PPE provided and worn? Lockout/tagout procedures implemented and
followed?
OSHA, NEC, NESC compliance?
Worker and supervisor training adequate?
(from NIOSH)
-
7/29/2019 Elec Standards
5/113
5 2006 TEEX
Types of Electrical Injuries
Electrocution (death due to electrical
shock)
Electrical shock
Burns (ugly pictures here)
Falls
http://www.osha.gov/SLTC/etools/construction/electrical_incidents/burn_examples.htmlhttp://www.osha.gov/SLTC/etools/construction/electrical_incidents/burn_examples.html -
7/29/2019 Elec Standards
6/113
6 2006 TEEX
Hazard Recognition
How can you sense electrical danger?
Cannot see, smell, taste, or hear danger
Can recognize unsafe conditions
-
7/29/2019 Elec Standards
7/113
7 2006 TEEX
Electrical Terminology
Current movement of electrical charge
Resistance opposition to current flow
Voltage measure of electrical force Conductors substances with little
resistance to electricity (such as metals)
Insulators substances with high resistance
to electricity (such as wood, rubber, glass, &bakelite)
Grounding a conductive connection to theearth (which acts as a protective measure)
-
7/29/2019 Elec Standards
8/113
8 2006 TEEX
Electrical Shock
Received when current passes through
body
Severity depends on: Path of current through body
Amount of current flowing through body
Length of time body is in circuitAlso: voltage, moisture, heart cycle, health
Low voltage is NOT low hazard!
-
7/29/2019 Elec Standards
9/113
9 2006 TEEX
Dangers of Electrical Shock
Currents >75 mA* can cause ventricular
fibrillation (rapid, ineffective heartbeat)
mA = milliampere = 1/1,000 of an ampere Death within minutes unless a defibrillator
is used
75 mA is not much current(a small power drill uses 30 times as much)
-
7/29/2019 Elec Standards
10/113
10 2006 TEEX
Effects of Current on Body
1 mA: Perception level, slight tingling.
5 mA: Slight shock; not painful.
Can usually let go.
Involuntary reactions can cause injuries.
6-30 mA: Painful shock
Muscular control lost
Freezing current or let-go range
-
7/29/2019 Elec Standards
11/113
11 2006 TEEX
Effects of Current on Body
50-150 mA: Extreme pain
Respiratory arrest; cannot let go
Death possible
1000-4300 mA: Ventricular fibrillation
Muscular contraction; nerve damage
Death likely
10000 mA: Cardiac arrest
Severe burns, probable death
-
7/29/2019 Elec Standards
12/113
12 2006 TEEX
How Shock Happens
Connection between:
2 wires of energized circuit
1 wire of energized circuit and ground Metallic part in contact with energized wire
and ground
-
7/29/2019 Elec Standards
13/113
13 2006 TEEX
Inadequate Wiring Hazards
What happens when a wire is too small
to carry the current safely?
Overheating Risk of fire or short circuit
Fuse acts as sacrificial
weak link Fuse too strong?
Other parts of the system
break first
Wire Gauge
WIRE
-
7/29/2019 Elec Standards
14/113
14 2006 TEEX
29 CFR 1910 and 29 CFR 1926
1910 Subpart S = Electrical
Revised 2/14/2007; effective in 180 days
1910 Subpart I = PPE 1910.137 Electrical Protective Devices
1926 Subpart K = Electrical
Protect against recognized hazards
-
7/29/2019 Elec Standards
15/113
15 2006 TEEX
Other Standards
NFPA 70E enacted to help meet CFR
Revised Subpart S based heavily on 2000
version 2004 version now published
OSHA chose which provisions of 70E to
adopt
-
7/29/2019 Elec Standards
16/113
16 2006 TEEX
29 CFR 1910 Subpart S
Electrical standards for general industry
302-308 and 399 updated: PM App. C
5 main groups of standards:
Design safety standards 302-330
Safety-related work practices 331-360
Reserved: maintenance, special equipment
Definitions: 399
-
7/29/2019 Elec Standards
17/113
17 2006 TEEX
1910.302 Electric utilization
systems (PM Appendix C)
Applicability of regulations
By type of installation
By installation date
-
7/29/2019 Elec Standards
18/113
General
1903.303
-
7/29/2019 Elec Standards
19/113
19 2006 TEEX
1910.303 (a) Approval
Conductors and equipment acceptable
only if approved
Note: If installation is made in accordancewith NEC or ANSI/NFPA it will be deemed
in compliance.
See definitions
-
7/29/2019 Elec Standards
20/113
20 2006 TEEX
1910.303(b) Examination,
installation, and use of equipment
Examinationshall be free of
recognized hazards
Suitability (check listing/labeling) Other factors listed in regulation
Installation and use by instructions
Insulation integrity Interrupting rating (fuses, breakers)
-
7/29/2019 Elec Standards
21/113
21 2006 TEEX
1910.303(b) Examination,
installation, and use of equipment
Circuit impedance
Deteriorating agents water, gases,
excessive temperature, corrosives Mechanical execution of work
Close unused openings for protection
Conductors racked for safe access
Internal parts not contaminated
No damaged parts
-
7/29/2019 Elec Standards
22/113
22 2006 TEEX
1910.303(b) Examination,
installation, and use of equipment
Mounting and cooling
Firmly secured
Air circulation; clearance Ventilation openings not obstructed
-
7/29/2019 Elec Standards
23/113
23 2006 TEEX
1910.303(c) Electrical
connections
General dissimilar metals
Terminals connections
Splices correctly performed, insulated
-
7/29/2019 Elec Standards
24/113
24 2006 TEEX
1910.303(d) Arcing parts
Some electrical equipment normally
produces arcs, sparks, flames, molten
metal Keep isolated from combustible material
-
7/29/2019 Elec Standards
25/113
25 2006 TEEX
1910.303(e) Marking
Manufacturer and ratings must be
marked
Voltage, current, wattage, etc. Durable markings in environment
1910 303(f) Di i
-
7/29/2019 Elec Standards
26/113
26 2006 TEEX
1910.303(f) Disconnecting
means and circuits
Legibly marked to indicate purpose
Unless purpose is evident
Durable Able to be locked open
Series combination rating = special
marking
-
7/29/2019 Elec Standards
27/113
Subtitles & Transitions
FOR EXAMPLE
Example of properly labeled
electric service: motors,
disconnects and breakers
1910 303( ) 600 V lt i l
-
7/29/2019 Elec Standards
28/113
28 2006 TEEX
1910.303(g) 600 Volts, nominal,
or less
1. Space about electric equipment
Space, not used for storage
Guarded when parts exposed Entrances
Illumination
Headroom
Control boards in dedicated, protected
space
1910 303( ) 600 V lt i l
-
7/29/2019 Elec Standards
29/113
29 2006 TEEX
1910.303(g) 600 Volts, nominal,
or less
2. Guarding of live parts
Live parts 50 volts protected from
people Protection from damage
Warning signs for unqualified persons
1910 303(h) O 600 lt
-
7/29/2019 Elec Standards
30/113
30 2006 TEEX
1910.303(h) Over 600 volts,
nominal
2. Enclosure / access control
3. Work space about equipment
4. Entrance and access to work space
5. Working space and guarding
-
7/29/2019 Elec Standards
31/113
Wiring Design and Protection
1903.304
1910 304( ) U d id ifi i
-
7/29/2019 Elec Standards
32/113
32 2006 TEEX
1910.304(a) Use and identification
of grounding conductors
1. Grounded & equipment groundingconductors identifiable &distinguishable
Grounded = white or gray
Equipment grounding = green, or greenwith yellow strips, or bare
2. Polarity may not be reversed3. Grounding devices not used for other
purposes
-
7/29/2019 Elec Standards
33/113
-
7/29/2019 Elec Standards
34/113
Subtitles & Transitions
FOR EXAMPLE
Example of properly labeled
electric service: motors,
disconnects and breakers
-
7/29/2019 Elec Standards
35/113
35 2006 TEEX
1910.304(b) Branch circuits
1. Identification of multiwire branch
circuits
For >1 voltage system in a building ID phase and system
Permanently posted at each panelboard
-
7/29/2019 Elec Standards
36/113
36 2006 TEEX
1910.304(b) Branch circuits
2. Receptacles and cord connectors
i. Grounding type for 15A & 20A circuits
Receptacles only on circuits matching voltageand current rating
ii. Grounding contacts grounded
Except portable / vehicle-mounted generators
Except replacement receptacles
iii. Grounding contact connected to
equipment grounding conductor
-
7/29/2019 Elec Standards
37/113
37 2006 TEEX
1910.304(b) Branch circuits
2. Receptacles and cord connectors
iv. Replacement of receptacles
Grounding-type where grounding meansexists
GFCI where required
Options for lack of grounding means
v. Plugs not interchangeable for differentvoltage, frequency, type of current
-
7/29/2019 Elec Standards
38/113
38 2006 TEEX
1910.304(b) Branch circuits
3. Ground-fault circuit interrupter (GFCI)
i. Bathroom or rooftops
ii. Temporary wiring: Including extension cords
If unavailable for less-usual type of
receptacle: assured equipment grounding
conductor program.
-
7/29/2019 Elec Standards
39/113
39 2006 TEEX
1910.304(b) Branch circuits
4. Outlet devices
i. Heavy-duty lampholders for >20A
ii. Receptacle outlets: Receptacle ampere rating branch circuit
For2 outlets on branch circuit: Table S-4
-
7/29/2019 Elec Standards
40/113
40 2006 TEEX
1910.304(b) Branch circuits
For2 outlets on branch circuit: Table S-5
50 A: receptacle branch-circuit rating
5. Cord connections: Outlet whereflexible cords with plugs used
1910 304(c) Outside conductors
-
7/29/2019 Elec Standards
41/113
41 2006 TEEX
1910.304(c) Outside conductors,
600 volts, nominal, or less
Clearance
1. Power conductors on poles
2. Clearance of open conductors fromground:
10 feet above sidewalk, grade, platform
12 feet vehicular traffic 15 feet truck traffic
18 feet public streets, alleys, driveways
1910 304(c) Outside conductors
-
7/29/2019 Elec Standards
42/113
42 2006 TEEX
1910.304(c) Outside conductors,
600 volts, nominal, or less
3. Clearance from building openings
No outer jacket: 3 foot clearance, except
above window Not beneath or obstructing openings
where materials may be moved
4. Above roofs: 8 ft above, 3 ft from edge
Pedestrians? Platform
Exceptions for slope, attachment
1910 304(d) Location of outdoor
-
7/29/2019 Elec Standards
43/113
43 2006 TEEX
1910.304(d) Location of outdoor
lamps
d. Location of outdoor lamps
Under energized equipment unless
Equipment can be locked out or
Clearance/other safeguards adequate
-
7/29/2019 Elec Standards
44/113
44 2006 TEEX
1910.304(e) Services
Disconnecting means
Main switch disconnects all, indicates
on/off Services over 600 volts, nominal
Accessible only to qualified; warning
signs
1910 304(f) Overcurrent
-
7/29/2019 Elec Standards
45/113
45 2006 TEEX
1910.304(f) Overcurrent
protection
1. 600 volts, nominal, or less
i. Protect conductors and equipment
iv. Overcurrent devices readily accessible To employees & building management
Not exposed to damage or ignitable material
v. Located/shielded to avoid injury/burns
vi. On/off position clearly indicatedvii. Vertical: up = on
2. Special rules for over 600 volts
-
7/29/2019 Elec Standards
46/113
46 2006 TEEX
1910.304(g) Grounding
1. Systems to be grounded
i. 3-wire DC: neutral conductor
ii. 2-wire DC, >50V-300V, with exceptionsiii. AC
-
7/29/2019 Elec Standards
47/113
47 2006 TEEX
1910.304(g) Grounding
2. Conductor to be grounded
3. Portable and vehicle-mounted
generators: frame as groundingelectrode
4. Grounding connections
5. Grounding path: permanent,continuous, effective
-
7/29/2019 Elec Standards
48/113
48 2006 TEEX
Grounding
One conductor of the circuit
intentionally grounded to earth
Protects circuit from lightningor other high voltage contact
Stabilizes the voltage in the system so
expected voltage levels are notexceeded under normal conditions
-
7/29/2019 Elec Standards
49/113
49 2006 TEEX
Grounding
Metal frames / enclosures of equipmentgrounded by permanent connection orbond
Equipment grounding conductorprovides path for dangerous faultcurrent to return to ground
If damage, corrosion, loosening, etc.impairs continuity, shock and burnhazards will develop
-
7/29/2019 Elec Standards
50/113
50 2006 TEEX
Grounding Path
Shall have capacity to conduct safely
any likely fault current.
Fault currents may be many timesnormal currents; can melt points of poor
conductivity
High temperatures = hazard; candestroy ground-fault path
-
7/29/2019 Elec Standards
51/113
51 2006 TEEX
1910.304(g) Grounding
6. Supports, enclosures, equipment
vi. Exposed non-current-carrying metal
parts of cord- and plug-connectedequipment
7. Nonelectrical equipment
8. Methods of grounding fixed equipment9. Grounding of systems and circuits
1000 volts and over (high voltage)
Ground fault circuit interrupters
-
7/29/2019 Elec Standards
52/113
52 2006 TEEX
Ground fault circuit interrupters
(GFCIs)
GFCI overcurrent device like a fuse or
circuit breaker
Designed to sense an imbalance incurrent flow over the normal path
Opens circuit if current in hot and
grounded wires differ by 5mA 1mA Must be installed correctly and tested
-
7/29/2019 Elec Standards
53/113
Wiring Methods, Components, andEquipment for General Use
1903.305
-
7/29/2019 Elec Standards
54/113
54 2006 TEEX
1910.305(a) Wiring methods
Not applicable to factory-assembled
1. General requirements
i. Metal parts as grounding conductors:effectively bonded
ii. Internal insulated grounding conductor
for isolated enclosure
iii. No wiring systems in ventilation ducts
-
7/29/2019 Elec Standards
55/113
55 2006 TEEX
1910.305(a) Wiring methods
2. Temporary wiring
Restricted uses
Removed after project completion
Requirements for feeders and branch
circuits
Grounding receptacles
No bare conductors or earth returns
Disconnecting switches
-
7/29/2019 Elec Standards
56/113
56 2006 TEEX
1910.305(a) Wiring methods
2.Temporary wiring, continued
Lamps protected from contact or breakage
Flexible cords protected from damage
Cables supported
1910 305(b) Cabinets boxes
-
7/29/2019 Elec Standards
57/113
57 2006 TEEX
1910.305(b) Cabinets, boxes,
and fittings
1. Conductors entering boxes, cabinets,or fittings
Must be protected from abrasion
Openings must be closed, with or withoutwires running through
2. Covers and canopies
Metal covers must be grounded >600V: complete, secure, marked
enclosure
-
7/29/2019 Elec Standards
58/113
58 2006 TEEX
1910.305(c) Switches
Gravity must not close switches
Warning if power may still be available
while switch is closed Faceplates where appropriate
Grounding
Switchboards panelboards and
-
7/29/2019 Elec Standards
59/113
59 2006 TEEX
Switchboards, panelboards, and
enclosures for damp locations
Switchboards and panelboards
Switchboards with exposed live parts: indry places accessible only to qualified
persons
Panelboards: in enclosures with no liveparts on front
Switches dead when open Enclosures for wet locations
Airspace, weatherproof
1910 305(f) Conductors for
-
7/29/2019 Elec Standards
60/113
60 2006 TEEX
1910.305(f) Conductors for
general wiring
Insulated unless otherwise permitted
Approved type for use
Distinguishable by color or other means Grounded
Ungrounded
Equipment grounding
1910 305(g) Flexible cords and
-
7/29/2019 Elec Standards
61/113
61 2006 TEEX
1910.305(g) Flexible cords and
cables
In general much more easily damaged
Should not be used if recognized
options can be used instead Must be approved for conditions and
location
Allowable purposes listed
1910 305(g) Flexible cords and
-
7/29/2019 Elec Standards
62/113
62 2006 TEEX
1910.305(g) Flexible cords and
cables
May not be substituted for fixed wiring
May not be run through walls, ceilings, floors,
doors, windows
May not be attached to buildings
May not be concealed in walls, ceilings, floors
May not be spliced, except hard service #14
Strain relief needed on connections
-
7/29/2019 Elec Standards
63/113
63 2006 TEEX
Flexible cords: Acceptable?
Short cord as part of a tool? Yes.
Temporary use of extension cord for
tool/appliance? Yes. Obviously not temporary? No.
Extended over distance to avoid
installing fixed outlet? No.
1910.305(j) Equipment for
-
7/29/2019 Elec Standards
64/113
64 2006 TEEX
1910.305(j) Equipment for
general use
1. Lighting fixtures, lampholders, lamps,receptacles
2. Receptacles, cord connectors, and
attachment plugs (caps)3. Appliances
4. Motors
5. Transformers6. Capacitors
7. Storage batteries
-
7/29/2019 Elec Standards
65/113
Specific Purpose Equipment andInstallations
1903.306
1910.306 Specific purpose
-
7/29/2019 Elec Standards
66/113
66 2006 TEEX
1910.306 Specific purpose
equipment and installations
a. Electric signs and outline lighting
b. Cranes and hoists
d. Electric weldersdisconnectingmeans
g. Induction and dielectric
-
7/29/2019 Elec Standards
67/113
Hazardous (Classified) Locations1903.307
1910.307 Hazardous (classified)
-
7/29/2019 Elec Standards
68/113
68 2006 TEEX
1910.307 Hazardous (classified)
locations
Classification based on flammablevapors, liquids, gases, combustibledusts or fibers
Each area considered individually
Classified by classes and divisions orzones
Documentation available for users,designers, installers, maintainers ofelectric equipment
1910.307 Hazardous (classified)
-
7/29/2019 Elec Standards
69/113
69 2006 TEEX
1910.307 Hazardous (classified)
locations
Definitions of classes and divisions in
1910.399, Definitions
Class I: flammable gases/vapors; explosiveor ignitable mixtures
Class II: combustible dust
Class III: easily ignitable fibers or flyings;
not likely to be in suspension
Division 1 & 2 for each; Zones 0-2 for
Class I
-
7/29/2019 Elec Standards
70/113
C d it d i t
-
7/29/2019 Elec Standards
71/113
71 2006 TEEX
Conduits and equipment
d. Conduits: threaded, wrench-tight or
bonding jumper
e. Equipment in Division 2 locations: Division 1 approved equipment = OK
General-purpose equipment OK if
demonstrably not a source of ignition
1910.307(f) Protection
-
7/29/2019 Elec Standards
72/113
72 2006 TEEX
1910.307(f) Protection
techniques
Explosionproof
apparatus
Dust ignitionproof
Dust-tight
Purged and
pressurized
Nonincendive circuit
Nonincendive
equipment
Nonincendive
component
Oil immersion
Hermetically sealed
Other protectiontechniques
1910.307(g) Class I, Zone 0, 1,
-
7/29/2019 Elec Standards
73/113
73 2006 TEEX
(g) , , ,
and 2 locations
Zone = alternative to divisions for Class
1
Classified by chemical properties andlikelihood of combustible atmosphere
Proper installation of conduit &
equipment to avoid sparks inflammable/combustible atmosphere
Protection techniques for certain zones
1910.307(g) Class I, Zone 0, 1,
-
7/29/2019 Elec Standards
74/113
74 2006 TEEX
(g) , , ,
and 2 locations
Special precaution: PE must classify
areas and specify equipment
Listing and marking: Listed for Zone 0 = OK for Zone 1-2
Listed for Zone 1 = OK for Zone 2
(For same gas or vapor) Marking requirements & exemption
More information in NFPA 70
1910 307( ) Cl I Z 0
-
7/29/2019 Elec Standards
75/113
75 2006 TEEX
1910.307(g) Class I, Zone 0
-
7/29/2019 Elec Standards
76/113
Special Systems1910.308
1910 308 Special s stems
-
7/29/2019 Elec Standards
77/113
77 2006 TEEX
1910.308 Special systems
a. Systems over 600 volts, nominal
b. Emergency power systems
c. Remote control, signaling, and power-limited circuits
d. Fire alarm systems
e. Communications systems
f. Solar photovoltaic systems
g. Integrated electrical systems
-
7/29/2019 Elec Standards
78/113
Definitions1910.399
1904 399 Definitions
-
7/29/2019 Elec Standards
79/113
79 2006 TEEX
1904.399 Definitions
New version supersedes older version
in CFR book
-
7/29/2019 Elec Standards
80/113
References for Further Information1910 SUBPART S APPENDIX A
1910 Subpart S Appendix A
-
7/29/2019 Elec Standards
81/113
81 2006 TEEX
1910 Subpart S Appendix A
Nonmandatory references aid in
understanding
Not a substitute for compliance with CFR
Appendices B and C removed
-
7/29/2019 Elec Standards
82/113
Safety-Related Work Practices1910.331-1910.335
1910 331 Scope
-
7/29/2019 Elec Standards
83/113
83 2006 TEEX
1910.331 Scope
Qualified persons (who have training inavoiding the electrical hazards)
Unqualified persons (with little or nosuch training)
Working on or near:
Premises wiring
Wiring for connection to supply
Other wiring
Vehicles excluded
1910 332 Training
-
7/29/2019 Elec Standards
84/113
84 2006 TEEX
1910.332 Training
a. Scope: employees with electric shock
risk not reduced to safe level by
installation requirementsb. Training content:
Work practices for job assignments
1910.331-335 and others necessary Qualified vs. unqualified
c. Classroom or on-the-job; risk based
Employees to be Trained
-
7/29/2019 Elec Standards
85/113
85 2006 TEEX
Employees to be Trained
Electricians and welders
Any others if:
work they do or supervise
comes close enough to exposed parts of
electric circuits 50V
for hazard to exist
-
7/29/2019 Elec Standards
86/113
Selection and Use of WorkPractices
1910.333
1910.333 (a)(1) Deenergized
-
7/29/2019 Elec Standards
87/113
87 2006 TEEX
parts
Live parts deenergized before employee
works on or near them:
Unless infeasible or causes greater hazard
-
7/29/2019 Elec Standards
88/113
88 2006 TEEX
exposed deenergized parts
If not locked out or tagged out, treated
as energized
Lockout/tagout rules followed in order
1910.147 provisions may also be OK
Written copy of procedures available
1910.333(b) Working on or near
-
7/29/2019 Elec Standards
89/113
89 2006 TEEX
exposed deenergized parts
Lockout/tagout steps in section (2):
ii. Deenergizing equipment
iii. Application of locks and tagsiv. Verification of deenergized condition
v. Reenergizing equipment after work
1910.333(c) Working on or near
-
7/29/2019 Elec Standards
90/113
90 2006 TEEX
exposed energized parts
Only qualified persons may work on
energized electric circuit parts
For work near overhead lines: Lines deenergized and grounded, or
Other protective measures provided
Working near overhead power
-
7/29/2019 Elec Standards
91/113
91 2006 TEEX
lines
Unqualified person near energized lines
Person and longest conductive object notcloser than 10 ft, + 4 in/10kV above 50kV
For elevated or ground work
Qualified person:
Closer approach only with insulation
Table S-5: distance varies by voltage Equipment: same distance as
unqualified
Working near overhead power
-
7/29/2019 Elec Standards
92/113
92 2006 TEEX
lines
Equipment: same distance asunqualified, with exceptions:
In transit, structure lowered: 4 ft +4 in/10kV
Insulating barriers, not part of vehicle
Aerial lift, insulated, with qualified person
Ground employees may not contact
equipment without protection or distance Employees may not stand at grounding
location when line contact possible
1910.333(c) Working on or near
-
7/29/2019 Elec Standards
93/113
93 2006 TEEX
exposed energized parts
4. Illumination must allow safe work
may not reach blindly in
5. Confined space work requiresprotective insulation & secured doors
6. Conductive materials: prevent contact
with energized parts7. Portable ladders: nonconductive
siderails
1910.333(c) Working on or near
-
7/29/2019 Elec Standards
94/113
94 2006 TEEX
exposed energized parts
8. Conductive apparel not worn, or
insulated
9. Housekeeping near live parts: Requires safeguards
No conductive cleaning materials,
including liquid solutions
10. Interlocks may only be defeated
temporarily by qualified person
-
7/29/2019 Elec Standards
95/113
Use of Equipment1910.334
1910.334(a) Portable electric
-
7/29/2019 Elec Standards
96/113
96 2006 TEEX
equipment
Handled in a manner to not cause
damage
Cords not used to raise/lowerequipment
Cords not stapled or hung in ways that
damage insulation
1910.334(a) Portable electric
-
7/29/2019 Elec Standards
97/113
97 2006 TEEX
equipment
Visual inspection required before use:
Portable cord / plug connected equipment
Extension cords
For external defects and evidence of internal
damage
If not exposed to damage, only when relocated
Defect or damage: remove, do not use until
repaired and tested
Plug and receptacle checked for compatibility
1910.334(a) Portable electric
-
7/29/2019 Elec Standards
98/113
98 2006 TEEX
equipment
Grounding type equipment: groundmust be maintained
Conductive work locations (e.g. wet)require approved equipment and cords
Connecting plugs:
Never plug or unplug live equipment with
wet hands Protect hands from conductive path (water)
Locking connectors: properly secured
1910.334(b) Electric power and
-
7/29/2019 Elec Standards
99/113
99 2006 TEEX
lighting circuits
Never reenergize a blown fuse
Never reenergize a circuit breaker until
it is safe (Overload or fault?) Never modify overcurrent protection
beyond 304 requirements
1910 334(c) and (d)
-
7/29/2019 Elec Standards
100/113
100 2006 TEEX
1910.334(c) and (d)
c. Test instruments and equipment
Only qualified persons may test electriccircuits or equipment
Test instruments must be visuallyinspected
Must be rated for circuits & environment
d. Occasional use of flammable andignitable materials: Do not useequipment that could ignite them
-
7/29/2019 Elec Standards
101/113
Safeguards for PersonnelProtection
1910.335
1910.335(a) Use of protective
-
7/29/2019 Elec Standards
102/113
102 2006 TEEX
equipment
Personal protective equipment
Must be provided with & use equipment
Maintained, inspected, and tested
Insulating material protected
Nonconductive head protection
Eye or face protection for arcs, flashes,
flying objects from explosions Insulated tools or handling equipment
Shields, insulation for heating/arcing
1910.335(b) Alerting techniques
-
7/29/2019 Elec Standards
103/113
103 2006 TEEX
1910.335(b) Alerting techniques
Techniques to warn and protect
employees:
Safety signs and tags Barricades
Attendants
Relevant Standards Outside 29
CFR 1910
-
7/29/2019 Elec Standards
104/113
104 2006 TEEX
CFR 1910
29 CFR 1926 Subpart K: construction
API RP 54
Section 9.14 Generators, Motors, andLighting
Section 10: Drilling and Well Servicing Rig
Electrical Systems
API RP 14F for offshore wiring
API RP 500 and 505: area classification
Clues that Electrical Hazards
E i t
-
7/29/2019 Elec Standards
105/113
105 2006 TEEX
Exist
Tripped circuit breakers or blown fuses
Warm tools, wires, cords, connections,
or junction boxes GFCI that shuts off a circuit
Worn or frayed insulation around wire or
connection
Example of properly labeled
electric service: motors
-
7/29/2019 Elec Standards
106/113
Subtitles & TransitionsFOR EXAMPLE
electric service: motors,
disconnects and breakers
Example of properly labeled
electric service: motors
-
7/29/2019 Elec Standards
107/113
Subtitles & TransitionsFOR EXAMPLE
electric service: motors,
disconnects and breakers
Example of properly labeled
electric service: motors
-
7/29/2019 Elec Standards
108/113
Subtitles & TransitionsFOR EXAMPLE
electric service: motors,
disconnects and breakers
Example of properly labeled
electric service: motors,
-
7/29/2019 Elec Standards
109/113
Subtitles & TransitionsFOR EXAMPLE
electric service: motors,
disconnects and breakers
Example of properly labeled
electric service: motors,
-
7/29/2019 Elec Standards
110/113
Subtitles & TransitionsFOR EXAMPLE
electric service: motors,
disconnects and breakers
Example of properly labeled
electric service: motors,
-
7/29/2019 Elec Standards
111/113
Subtitles & TransitionsFOR EXAMPLE
electric service: motors,
disconnects and breakers
OSHA Resources
-
7/29/2019 Elec Standards
112/113
112 2006 TEEX
Pub 3075 Controlling Electrical Hazards
Small Business Handbook section
Inspection Procedures Electrical Safety-Related Work Practices --
Inspection Procedures and Interpretation
Guidelines
Interpretations
http://www.osha.gov/Publications/osha3075.pdfhttp://www.osha.gov/dcsp/smallbusiness/small-business.htmlhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=DIRECTIVES&p_id=1750http://www.osha.gov/dcsp/smallbusiness/small-business.htmlhttp://www.osha.gov/Publications/osha3075.pdf -
7/29/2019 Elec Standards
113/113
p
Training requirements for employeeswho perform non-electrical work onelectrical equipment
Qualifications for resetting circuits orreplacing fuses; electrical enclosuresmust be approved
Use of compressed air above 30 p.s.i.for cleaning purposes; nonmetallic-sheathed cable for temporary wiring
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24009&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24009&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24009&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24112&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24009&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24009&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24009&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSEhttp://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24120&p_text_version=FALSE