Mạch nhánh & Đi dâyCâu 147 / 521
Where cables or raceways are run parallel to framing members, the wiring must be kept at least what distance from the nearest edge of a wood stud where nails or screws are likely, unless protected by a steel plate?
a.3/4 in
b.1 in
c.1-1/8 in
d.1-1/4 in
Giải thích
Section 300.4(D) requires cables and raceways run parallel to framing to be at least 1-1/4 in from the nearest edge where nails or screws are likely; otherwise a 1/16-in steel plate is required. The smaller distances of 3/4, 1, and 1-1/8 in do not provide the required setback.
Trích dẫn luật: 2023 NEC §300.4(D)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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