Advanced WiringCâu 77 / 110
A motor feeder supplies motors whose largest branch device is 90 A, plus other motors with 50 A total full-load current. What is the maximum feeder short-circuit/ground-fault device (not to exceed the sum, next standard down)?
a.125 A
b.150 A
c.175 A
d.110 A
Giải thích
The feeder device may not exceed the largest branch-circuit device (90 A) plus the other FLCs (50 A) = 140 A; the largest standard rating not exceeding 140 A is 125 A.
Trích dẫn luật: 2023 NEC 430.62Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
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