Mạch nhánh & Đi dâyCâu 179 / 521
Couplings and connectors used with electrical metallic tubing (EMT) in a wet location must be what?
a.Threaded
b.Set-screw type
c.Painted
d.Listed for use in wet locations
Giải thích
Section 358.42 requires EMT couplings and connectors used in wet locations to be listed for wet locations, commonly the raintight compression type. Plain set-screw fittings are not raintight, threading does not apply to EMT couplings, and paint does not make a fitting suitable for wet locations.
Trích dẫn luật: 2023 NEC §358.42Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Under 240.4(D), what is the maximum overcurrent protection permitted for a 12 AWG copper branch-circuit conductor, absent a specific exception?
- The rating of a branch circuit supplying two or more outlets is determined by what?
- The working space required in front of electrical equipment must be kept clear and, in general, may be used for what purpose?
- An outlet box used as the sole support for a ceiling-suspended (paddle) fan must be what?
- A 4" x 1-1/2" square box has a volume of 21.0 in³. With no clamps, devices, or other allowances, what is the maximum number of 14 AWG conductors permitted in the box?
- Using the same 21.0 in³ box with no other fill allowances, what is the maximum number of 12 AWG conductors permitted?
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