Mạch nhánh & Đi dâyCâu 140 / 521
Along its length, liquidtight flexible metal conduit (LFMC) must be supported at intervals not exceeding what distance?
a.4.5 ft
b.6 ft
c.8 ft
d.10 ft
Giải thích
Section 350.30(A) requires LFMC to be supported at intervals not exceeding 4.5 ft (1.4 m) along the run, in addition to fastening within 12 in of boxes. 6, 8, and 10 ft all exceed the maximum support spacing for this flexible raceway.
Trích dẫn luật: 2023 NEC §350.30(B)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- Rigid metal conduit (RMC) must be securely fastened within what distance of each outlet box, junction box, or termination?
- For 1/2-inch through 3/4-inch trade size rigid metal conduit (RMC), what is the maximum spacing between supports on a straight horizontal run per Table 344.30(B)?
- For 1/2-inch through 1-inch trade size rigid PVC conduit, what is the maximum support spacing per Table 352.30?
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