Mạch nhánh & Đi dâyCâu 221 / 521
Per 330.30, Type MC cable must be supported and secured at intervals not exceeding what distance?
a.6 ft (1.8 m)
b.4-1/2 ft (1.4 m)
c.3 ft (900 mm)
d.10 ft (3.0 m)
Giải thích
Section 330.30 requires MC cable to be secured at intervals not exceeding 6 ft, and within 12 in of a box where practicable. 4-1/2 ft is the NM/AC interval; 3 ft and 10 ft are not MC support values.
Trích dẫn luật: 2023 NEC §330.30Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A 12-2 Type NM cable (two 12 AWG conductors plus ground) is used for a general branch circuit. Using the required NM temperature column, what is the ampacity of its 12 AWG conductors?
- Per 334.30, Type NM cable must be secured and supported at intervals not exceeding what distance along the run?
- Per 334.12, which of the following installations is NOT permitted for Type NM cable?
- 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?
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