An toànCâu 422 / 521
On a construction site, which receptacles must have GFCI protection for personnel?
a.Only receptacles rated above 250 volts
b.Only receptacles inside finished rooms
c.None, as long as the power tools are double-insulated
d.All 125-volt, 15-, 20-, and 30-ampere receptacles that are not part of the permanent building wiring
Giải thích
Temporary construction power requires GFCI protection on all 125V, 15/20/30A receptacles that are not part of the permanent wiring (or an assured equipment grounding conductor program). Voltage rating and room finish do not exempt them, and double-insulated tools do not remove the receptacle requirement.
Trích dẫn luật: 2023 NEC §590.6Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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