Mạch nhánh & Đi dâyCâu 137 / 521
After the required fastening near boxes, EMT must be supported at intervals not exceeding what distance?
a.8 ft
b.10 ft
c.12 ft
d.6 ft
Giải thích
Section 358.30(A) requires EMT to be supported at least every 10 ft along the run. Combined with fastening within 3 ft of boxes, this keeps the raceway secure. 8 and 6 ft are stricter than required, and 12 ft exceeds the maximum support spacing.
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
- 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?
- Electrical metallic tubing (EMT) must be securely fastened within what distance of each outlet box, junction box, or fitting?
- 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?
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- Along its length, liquidtight flexible metal conduit (LFMC) must be supported at intervals not exceeding what distance?
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