Mạch nhánh & Đi dâyCâu 143 / 521
For 1/2-inch through 1-inch trade size rigid PVC conduit, what is the maximum support spacing per Table 352.30?
a.5 ft
b.4 ft
c.6 ft
d.3 ft
Giải thích
Table 352.30 requires support of rigid PVC conduit sized 1/2 in through 1 in at intervals not exceeding 3 ft because PVC is more flexible than metal raceway. Larger sizes allow wider spacing. 5, 4, and 6 ft all exceed the 3-ft maximum for these small sizes.
Trích dẫn luật: 2023 NEC §352.30(B)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Along its length, liquidtight flexible metal conduit (LFMC) must be supported at intervals not exceeding what distance?
- 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)?
- 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?
- Under Table 300.5, what is the minimum burial depth for a direct-buried rigid metal conduit (RMC) installed under a residential driveway of a one-family dwelling?
- Per Table 300.5, what is the minimum cover for direct-buried UF cable (without other protection) not under a driveway, in a residential branch circuit application?
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