Mạch nhánh & Đi dâyCâu 136 / 521
Electrical metallic tubing (EMT) must be securely fastened within what distance of each outlet box, junction box, or fitting?
a.3 ft
b.4 ft
c.5 ft
d.6 ft
Giải thích
Section 358.30(A) requires EMT to be securely fastened in place within 3 ft of each box, cabinet, or termination. It must also be supported at intervals not exceeding 10 ft. 4, 5, and 6 ft all exceed the 3-ft fastening distance from boxes.
Trích dẫn luật: 2023 NEC §358.30(A)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the minimum depth of working space in front of electrical equipment operating at 0 to 150 volts to ground, where there are exposed live parts on one side and no live or grounded parts on the other (Condition 1)?
- The width of the working space in front of electrical equipment must be at least the width of the equipment or what minimum, whichever is greater?
- What is the minimum height (headroom) of the working space about electrical equipment such as panelboards, generally required by 110.26?
- After the required fastening near boxes, EMT must be supported at intervals not exceeding what distance?
- Between pull points (for example, from box to box), the total number of bends in one run of EMT must not exceed the equivalent of how many degrees?
- Liquidtight flexible metal conduit (LFMC) must be securely fastened within what distance of each box, cabinet, or fitting where the conduit is not fished?
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