An toànCâu 455 / 521
When an electrician may be working near energized electrical parts or overhead lines, which ladder should be used?
a.An aluminum ladder because it is lighter and stronger
b.Any metal ladder that is available
c.A non-conductive ladder such as fiberglass or dry wood, never a metal ladder near live electrical work
d.A steel ladder that is bonded to a ground rod
Giải thích
Electricians must use non-conductive ladders (fiberglass or dry wood) near energized parts and overhead lines so the ladder cannot become an electrical path. Aluminum, other metal, or a 'grounded' steel ladder can conduct fault current through the worker and is prohibited for this work.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A standard guardrail system's top rail must be approximately what height above the walking/working surface?
- A straight or extension ladder should be set at a safe angle by placing its base at what distance from the wall?
- A straight or extension ladder used to reach an upper landing must extend at least how far above the landing surface?
- The safe practice when climbing a portable ladder is to:
- A space is a 'permit-required confined space' when it is large enough to enter, has limited means of entry/exit, is not designed for continuous occupancy, AND:
- Before entering a permit-required confined space, the atmosphere should be tested in what order?
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