Mạch nhánh & Đi dâyCâu 225 / 521
Per 320.30, Type AC cable must be secured and supported at intervals not exceeding what distance?
a.4-1/2 ft (1.4 m)
b.6 ft (1.8 m)
c.3 ft (900 mm)
d.10 ft (3.0 m)
Giải thích
Section 320.30 requires AC cable to be secured at intervals not exceeding 4-1/2 ft, and within 12 in of every box or fitting. 6 ft is the MC interval; 3 ft and 10 ft are not AC support values.
Trích dẫn luật: 2023 NEC §320.30Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Which statement about Type MC cable ampacity is correct?
- Under what condition may Type MC cable be installed in a wet location?
- Per 320.40, what must be installed at each termination of Type AC (armored) cable to protect the conductors from the cut edge of the metal armor?
- Which cable relies on its metal armor together with an internal aluminum bonding strip to serve as the equipment grounding path?
- The NEC informational note recommends that voltage drop on a branch circuit not exceed what percentage of the circuit voltage?
- For the combined feeder plus branch circuit, the NEC informational note recommends total voltage drop not exceed what percentage?
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