An toànCâu 470 / 521
When an arc-flash risk assessment requires it, in addition to arc-rated clothing a worker must protect the face and head with:
a.An arc-rated face shield with balaclava, or an arc-rated flash-suit hood
b.A pair of tinted sunglasses
c.A simple disposable dust mask
d.Nothing extra beyond the shirt
Giải thích
Face and head protection for arc flash means an arc-rated face shield with a balaclava (sock hood) or a full arc-rated flash-suit hood, selected to the incident energy. Sunglasses, a dust mask, or no additional protection do not shield the face from the intense heat and light of an arc.
Trích dẫn luật: NFPA 70ELuyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- When working within the restricted approach boundary of exposed energized parts, hand tools should be:
- 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:
- Standard electrical arc-flash PPE also includes head and hearing protection because:
- 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:
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