Mạch nhánh & Đi dâyCâu 236 / 521
Per 250.119, an equipment grounding conductor may be identified by which of the following?
a.White insulation
b.Gray insulation
c.Blue insulation
d.Green, green with yellow stripe, or bare
Giải thích
Section 250.119 permits equipment grounding conductors to be green, green with one or more yellow stripes, or bare. White and gray are reserved for grounded (neutral) conductors, and blue is used as an ungrounded conductor color.
Trích dẫn luật: 2023 NEC §250.119Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- To reduce voltage drop on a long branch-circuit run without changing the load, what is the most effective method?
- 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 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?
- Which set of colors is NOT permitted for ungrounded (hot) conductors, because these colors are reserved for other uses?
- 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?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra