An toànCâu 427 / 521
Crossing the restricted approach boundary toward an exposed energized part requires:
a.No special precautions because it is close to the equipment
b.Only safety glasses
c.A hard hat and nothing else
d.A qualified person, a documented plan/energized work permit, and appropriate shock PPE such as voltage-rated gloves
Giải thích
The restricted approach boundary is close to the live part, where an increased risk of shock from inadvertent movement exists. Only a qualified person may cross it, and only with a plan/permit and shock PPE (e.g., rated gloves). Glasses or a hard hat alone are inadequate for the shock hazard at that distance.
Trích dẫn luật: NFPA 70ELuyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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