An toànCâu 471 / 521
Standard electrical arc-flash PPE also includes head and hearing protection because:
a.Electrical arcs are silent and harmless to the ears
b.Hard hats are always optional for electricians
c.An arc blast produces intense heat, pressure, and sound, so a non-conductive (Class E) hard hat and hearing protection are required
d.Only the gloves matter during an arc event
Giải thích
An arc blast releases extreme heat, a pressure wave, and very loud sound, so a Class E (electrical) hard hat and hearing protection are part of the PPE. Arcs are far from silent, hard hats are not optional in this work, and gloves alone do not address the head, hearing, and blast hazards.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- To protect other workers from an area where justified energized work is being performed, the qualified person should:
- Class 00 and Class 0 rubber insulating gloves are rated for maximum AC use voltages of approximately:
- When an arc-flash risk assessment requires it, in addition to arc-rated clothing a worker must protect the face and head with:
- For electrical work, a hard hat should be:
- Immediately after you open a disconnect switch, all the conductors on the load side should be treated as:
- On de-energized conductors or equipment where accidental re-energization or induced voltage is possible, workers protect themselves by applying:
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