Electrical Wiring Design and Protection Checklist

7/24/2019 Electrical Wiring Design and Protection Checklist

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Electrical Wiring Design andProtection

Self-Inspection Checklist

Guidelines: This checklist covers regulations issued by the U.S. Department of Labor, Occupational Safety and Health dministration

!OSH" under the general industry standards subpart S #$ %&' ($().*)+ and ($().*) and the construction standards subpart -%&' ($#.+)+ and ($#.+). /t applies to all electrical use systems. This checklist does not cover installations in ships, 0atercrafts,rail0ay rolling stock, aircrafts, or automotive vehicles other than mobile homes and recreational vehicles. The regulations cited applyonly to private employers and their employees, unless adopted by a State agency and applied to other groups such as publicemployees. Definitions of terms in bold type are provided at the end of the checklist to help you understand some of the 1uestions.

This checklist does not address regulations dealing with outside conductors, !! "olts, no#inal, or less$ ser"ices to%uildings$ o"ercurrent protection &fuses and circuit %reakers' for o"er !! "olts, no#inal$ and grounding for o"er (,!!!"olts) /f any of these conditions are encountered, consult the OSH regulations.

Please Circle

*se and Identification of Grounded and Grounding Conductors

*

(. re conductors used for grounding identified and distinguishable from allother conductors2 3#$ %&' ($().*)+!a"!(" and ($#.+)+!a"!("4

+ote: Grounding conductors should be colored 0hite according to the5ational 6lectric %ode.

+ +.

#. Have all grounded conductors maintained the designated polarity 0henattached to a terminal or lead2 3#$ %&' ($().*)+!a"!#" and ($#.+)+!a"

!#"4

+ote: 6lectrical outlets !receptacles", 0hen tested 0ith a circuit analy7er,

should not sho0 a reversed polarity, open neutral, or neutral reversed 0ithany other line.

+ +.

3. /s the use of a grounding terminal or grounding8type device prohibited on a

receptacle, cord connector, or plug attachment, e9cept for the purpose ofgrounding2 3#$ %&' ($().*)+!a"!*" and ($#.+)+!a"!*"4

+ +.

/"ercurrent Protection !! 0olts, +o#inal, or 1ess

4. re conductors and e1uipment protected from o"ercurrent in accordance

0ith their ability to conduct current safely2 3#$ %&' ($().*)+!e"!("!i" and($#.+)+!e"!("!i"4

+ +.

*5. re o"ercurrent devices !e9cept for the motor running overload

protection" designed so as to not interrupt the continuity of the grounded conductors

unless all conductors of the circuit are opened simultaneously2

3#$ %&' ($().*)+!e"!("!ii" and ($#.+)+!e"!("!ii"4

+ +.

6. re disconnecting #eans provided for !a" all cartridge fuses !e9cept for

service fuses" that are accessible to other than 1ualified persons and !b" allfuses and thermal cutouts on circuits over (:) volts to the ground2

3#$ %&' ($().*)+!e"!("!iii" and ($#.+)+!e"!("!iii"4

+ +.

7. /s this disconnecting #eans installed so that the fuse or thermal cutout + +.



can be disconnected from its supply 0ithout disrupting service to thee1uipment and circuits unrelated to those protected by the o"ercurrent

device2 3#$ %&' ($().*)+!e"!("!iii" and ($#.+)+!e"!("!iii"4

8. re o"ercurrent devices readily accessible to all authori7ed personnel2 3#$

%&' ($().*)+!e"!("!iv" and ($#.+)+!e"!("!iv"4

+ +.

9. re the o"ercurrent devices located so that they 0ill not be e9posed to

physical damage nor located near easily ignitable material2 3#$ %&'

($().*)+!e"!("!iv" and ($#.+)+!e"!("!iv"4

+ +.

10. re fuses and circuit breakers located or shielded so that

people 0ill not be burned or other0ise in;ured by

their operation2 3#$ %&' ($().*)+!e"!("!v" and

($#.+)+!e"!("!v"4

+ +.

11. re circuit breakers clearly indicated 0hether they are in the open !off" or

closed !on" position2 3#$ %&' ($().*)+!e"!("!vi"!" and ($#.+)+!e"!("!vi"!"4

+ +.

12. <hen circuit breaker handles on s0itchboards are operated vertically rather

than hori7ontally or rotationally, is the up position the closed !on" position2

3#$ %&' ($().*)+!e"!("!vi"!=" and ($#.+)+!e"!("!vi"!="4

+ +.

13. On s0itches in (#)8volt fluorescent lighting circuits, is the circuit breaker

approved for this purpose and marked >S<D>2

3#$ %&' ($().*)+!e"!("!vi"!%" and ($#.+)+!e"!("!vi"!%"4

+ +.

14. <hen installed 0ithin a si9 foot radius of sinks, are (#:8volt, single8phase,

(:8 and #)8amp receptacles e1uipped 0ith a ground-fault circuit

interrupter2 3recommended4

+ +.

15. <hen installed outdoors, are (#:8volt, single8phase, (:8 and #)8amp

receptacles e1uipped 0ith a ground-fault circuit interrupter2

3recommended4

+ +.

16. re all o"ercurrent devices legibly marked to indicate its purpose2 3#$ %&'

($().*)*!f"4

+ +.

Grounding

*

17. re all neutral conductors grounded in all three80ire D%

systems2 3#$ %&' ($().*)+!f"!("!i" and ($#.+)+!f"!("!i"4

+ +.

*

(?. re all t0o80ire D% systems operating at :) volts through *)) voltsbet0een conductors grounded2 3#$ %&' ($().*)+!f"!("!ii" and

($#.+)+!f"!("!ii"4

+ote: 69ceptions to this re1uirement are permitted 0hen !a" they supplyonly industrial e1uipment in limited areas and are e1uipped 0ith a grounddetector@ or !b" they are fire8protective signaling circuits having a

ma9imum current of ).)*) amperes.

+ +.

*

19. re all % circuits of less than :) volts grounded 0hen !a" they are

installed as overhead conductors outside a building, or !b" they are suppliedby transformers, and the transformerAs primary supply system is ngrounded

or e9ceeds (:) volts to ground2 3#$ %&' ($().*)+!f"!("!iii" and

($#.+)+!f"!("!iii"4

+ +.

re all % systems of :) volts to (,))) volts grounded2 3#$ %&' + +.



($().*)+!f"!("!iv" and ($#.+)+!f"!("!iv"4

+ote: See OSH regulations for possible e9emptions to this re1uirement.

6lectrical outlet receptacles should not indicate an open ground 0hen tested0ith a circuit analy7er.

*

21. &or % premises 0iring systems, is the identified conductor grounded2 3#$

%&' ($().*)+!f"!#" and ($#.+)+!f"!+"4

+ +.

*

##. <hen systems are grounded, is a grounding electrode conductor used toconnect both the e1uipment grounding conductor and the grounded circuitconductor to the grounding electrode2 3#$ %&' ($().*)+!f"!*"!i" and

($#.+)+!f"!:"!i"4

+ote: This is only determined at the main service or vault.

+ +.

*

23. re both the e1uipment grounding conductor and the grounding electrode

conductor connected to the grounded circuit conductor !a" on the supply

side of the service disconnecting #eans, or !b" on the supply side of the

system disconnecting #eans or o"ercurrent device if the system is

separately derived2

3#$ %&' ($().*)+!f"!*"!i" and ($#.+)+!f"!:"!i"4

+ +.

*

24. On ungrounded service8supplied systems, is the e1uipment grounding

conductor connected to the grounding electrode conductor at the servicee1uipment2 3#$ %&' ($().*)+!f"!*"!ii" and ($#.+)+!f"!:"!ii"4

+ +.

25. /s the path to the ground from circuits, e1uipment, and enclosures

permanent and continuous2 3#$ %&' ($().*)+!f"!+" and ($#.+)+!f"!"4

+ +.

*

#. re metal cable trays, metal racewa2s, and metal enclosures forconductors grounded2 3#$ %&' ($().*)+!f"!:"!i" and ($#.+)+!f"!"!i"4

+ote: See OSH regulations for possible e9emptions to this re1uirement.

+ +.

*

27. re metal enclosures for ser"ice e1uipment grounded2

3#$ %&' ($().*)+!f"!:"!ii" and ($#.+)+!f"!"!ii"4

+ +.

*

28. re the follo0ing appliances groundedB frames of electric

ranges, 0all8mounted ovens, counter8mounted cooking units,

clothes dryers, and metal outlets or con;unction bo9es that

are part of the circuit for these appliances2

3#$ %&' ($().*)+!f"!:"!iii"4

+ +.

29. re e9posed noncurrent8carrying metal parts of fi9ed e1uipment that may

be energi7ed grounded2 3#$ %&' ($().*)+!f"!:"!iv" and ($#.+)+!f"!"!iii"4

+ +.

*). re all e9posed noncurrent8carrying metal parts of cord and plug connectede1uipment grounded2 3#$ %&' ($().*)+!f"!:"!v" and ($#.+)+!f"!"!iv"4

+ote: This applies to metal cases of tools and e1uipment e9cept those thatare double insulated.

+ +.

*

<hen re1uired, are the noncurrent8carrying metal parts of fi9ed e1uipmentgrounded by an e1uipment grounding conductor contained in the same

race0ay, cable, or cord, or runs 0ith or encloses the circuit conductors2

3#$ %&' ($().*)+!f"!"!i" and ($#.+)+!f"!?"!i"4

+ +.



5oteB &or D% circuits only, the e1uipment grounding

conductor may be run separately from the circuit conductors.

3a4ardous 1ocations

32. re all e1uipment, 0iring methods, and installations of e1uipment in

ha4ardous &classified' locations intrinsically safe, approved for theha7ardous location, or safe for the ha7ardous location2 3#$ %&'

($().*)!b" and ($#.+)!b"4

+ +.

33. /s e1uipment approved not only for the class of location but also for the

ignitable or combustible properties of the gas, vapor, dust, or fiber that 0ill

be present2 3#$ %&' ($().*)!b"!#"!i" and ($#.+)!b"!#"!i"4

+ +.

34. /s e1uipment in a ha7ardous location marked to sho0 the class, group, and

operating temperature2 3#$ %&' ($().*)!b"!#"!ii" and ($#.+)!b"!#"!ii"4

+ +.

35. re all conduits threaded and made 0rench8tight2 3#$ %&' ($().*)!c" and

($#.+)!c"4

+ +.

Definitions:

Disconnecting #eans: a device, group of devices, or other means by 0hich the conductors of a circuit can be disconnected from

their source of supply.

Ground-fault circuit interrupter: interrupterBa fast8acting circuit breaker that senses small imbalances in the circuit caused bycurrent leakage to ground and, in a fraction of a second, shuts off the electricity.Grounded: connected to the earth or to a conducting body.Grounded conductor: a system or circuit conductor that is intentionally grounded.Grounding conductor: a conductor used to connect e1uipment or the grounded circuit of a 0iring system to a grounding electrode

or electrodes.3a4ardous &classified' locations: areas that have volatile flammable li1uids or e9cessive dust that represent a significant fire ore9plosion ha7ard. Such locations are assigned si9 designations as follo0sB %lass /, Division (@ %lass /, Division #@ %lass //, Division (@%lass //, Division #@ %lass ///, Division (@ and %lass ///, Division #./"ercurrent: any current in e9cess of the rated current of e1uipment or the ampacity of a conductor. /t may result from overload,short circuit, or ground fault. current in e9cess of rating may be accommodated by certain e1uipment and conductors for a givenset of conditions. Hence the rules for overcurrent protection are specific for particular situations./"ercurrent protection: a device such as a fuse or circuit breaker used to prevent an overcurrent.5acewa2: a channel designed for holding 0ires, cables, or busbars, 0ith additional functions as permitted. 'ace0ays may be ofmetal or insulating materials, and the term includes rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, li1uid8

tight fle9ible metal conduit, fle9ible metallic tubing, fle9ible metal conduit, electrical metallic tubing, underfloor race0ays, cellularconcrete floor race0ays, cellular metal floor race0ays, surface race0ays, 0ire0ays, and bus0ays.Ser"ice: the conductors and e1uipment for delivering energy from the electricity supply system to the 0iring system of the premisesserved.

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Electrical Wiring Design and Protection Checklist