Mạch nhánh & Đi dâyCâu 238 / 521
Which set of colors is NOT permitted for ungrounded (hot) conductors, because these colors are reserved for other uses?
a.Black and red
b.White, gray, and green
c.Blue and brown
d.Orange and yellow
Giải thích
White and gray are reserved for grounded (neutral) conductors and green (or green/yellow) for grounding, so none may be used for ungrounded conductors. Black, red, blue, brown, orange, and yellow are all acceptable ungrounded colors.
Trích dẫn luật: 2023 NEC §200.6Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- If the one-way length of a circuit run is doubled while current and conductor size stay the same, what happens to the voltage drop?
- Per 200.6(A), a grounded (neutral) conductor 6 AWG or smaller must be identified by which of the following?
- Per 250.119, an equipment grounding conductor may be identified by which of the following?
- Per 110.15, on a 4-wire delta-connected 120/240 V system, the high-leg (the conductor with the higher voltage to ground) must be identified by what color?
- Per 210.5(C), where a building is supplied by more than one nominal voltage system, how must the ungrounded branch-circuit conductors be treated?
- Per 200.6(B), how may a grounded (neutral) conductor larger than 6 AWG be identified?
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