Dịch vụ & Phân phốiCâu 26 / 521
Which of the following is NOT a standard ampere rating for a fuse or inverse-time breaker per 240.6(A)?
a.45 A
b.70 A
c.110 A
d.130 A
Giải thích
The standard ratings in 240.6(A) include 45, 70, and 110 A, but 130 A is not listed (the next standard sizes are 125 A and 150 A). Knowing the standard list is essential for applying the next-size-up rule.
Trích dẫn luật: 2023 NEC §240.6(A)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Six 3 AWG THHN copper conductors (90 C ampacity 110 A) are in one raceway at 30 C ambient. After the fill adjustment, what is the derated ampacity?
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