Mạch nhánh & Đi dâyCâu 219 / 521
Per 334.30, Type NM cable must be secured and supported at intervals not exceeding what distance along the run?
a.3 ft (900 mm)
b.6 ft (1.8 m)
c.4-1/2 ft (1.4 m)
d.10 ft (3.0 m)
Giải thích
Section 334.30 requires NM 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, while 3 ft and 10 ft are not NM support values.
Trích dẫn luật: 2023 NEC §334.30Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Per 334.80, the ampacity of Type NM (nonmetallic-sheathed) cable is based on which temperature column of Table 310.16?
- For Type NM cable, the 90°C rating of its conductors may be used for what purpose?
- 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 334.12, which of the following installations is NOT permitted for Type NM cable?
- Per 330.30, Type MC cable must be supported and secured at intervals not exceeding what distance?
- Which statement about Type MC cable ampacity is correct?
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