Mạch nhánh & Đi dâyCâu 141 / 521
Rigid metal conduit (RMC) must be securely fastened within what distance of each outlet box, junction box, or termination?
a.2 ft
b.3 ft
c.5 ft
d.6 ft
Giải thích
Section 344.30(A) requires RMC to be securely fastened within 3 ft of each box, cabinet, or fitting. Support intervals along the run then follow Table 344.30(B). 2 ft is stricter than the code minimum, while 5 and 6 ft exceed the required fastening distance.
Trích dẫn luật: 2023 NEC §344.30(A)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- Along its length, liquidtight flexible metal conduit (LFMC) must be supported at intervals not exceeding what distance?
- 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?
- Expansion fittings for rigid PVC conduit must be provided to compensate for thermal expansion and contraction where the length change is expected to be at least how much?
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