An toànCâu 474 / 521
On de-energized conductors or equipment where accidental re-energization or induced voltage is possible, workers protect themselves by applying:
a.Nothing extra, since the switch is open
b.Temporary protective grounds (a grounding cluster) to keep the conductors at or near zero potential
c.Only rubber insulating blankets over the parts
d.A warning sign at the panel and nothing more
Giải thích
Temporary protective grounds bond de-energized conductors together and to ground, so any accidental re-energization or induced voltage is shunted safely instead of flowing through a worker. An open switch, blankets, or a sign alone do not protect against an unexpected re-energization the way applied grounds do.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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