Mạch nhánh & Đi dâyCâu 191 / 521
Per Chapter 9, Table 1, what is the maximum permitted fill percentage when exactly two conductors are installed in a conduit?
a.40%
b.53%
c.31%
d.25%
Giải thích
Table 1 sets a 31% fill limit for exactly two conductors, reflecting the jamming ratio concern. 40% applies to three or more, 53% to a single conductor, and 25% is not used.
Trích dẫn luật: 2023 NEC Chapter 9, Table 1Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A single unbroken conductor passes straight through a box without being spliced or terminated. For box fill, it is counted as how many conductors?
- How are conductors that both originate and terminate within the box (such as short pigtails or jumpers) treated in a box-fill calculation?
- Per Chapter 9, Table 1, what is the maximum permitted conduit fill percentage when three or more conductors are installed in a raceway?
- Per Chapter 9, Table 1, what is the maximum permitted fill percentage when only one conductor is installed in a conduit?
- Per Annex C, Table C.1, what is the maximum number of 12 AWG THHN conductors permitted in 1/2" EMT?
- Per Annex C, Table C.1, what is the maximum number of 14 AWG THHN conductors permitted in 1/2" EMT?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra