An toànCâu 466 / 521
Which equipment, when likely to require examination or servicing while energized, must be field- or factory-marked to warn of potential arc-flash hazards?
a.Residential 15-ampere receptacles
b.Only equipment operating above 1,000 volts
c.Household doorbell transformers
d.Switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers in other than dwelling units
Giải thích
The Code requires arc-flash hazard marking on switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers in other than dwellings likely to be worked on energized. Small residential receptacles and doorbell transformers are not the targeted equipment, and the requirement is not limited to over 1,000V.
Trích dẫn luật: 2023 NEC §110.16Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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