Guarding of Live Parts

Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous ______ forbidding unqualified persons to enter.

a) warning signs
b) alarms
c) a or b
d) neither a or b

See answer and applicable Code reference

The correct answer is: a) warning signs

Article 110 covers general requirements for electrical installations. As noted in Sec. 110.27(C), "Entrance to rooms and other guarded locations that contain exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. The marking shall meet the requirements in 110.21(B)."

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