Thiết bị & Hệ thốngCâu 275 / 521
A continuous-duty motor has a nameplate FLA of 62 A and a service factor of 1.15. What is the maximum overload device rating at 125% under NEC 430.32(A)(1)?
a.62 A
b.71.3 A
c.77.5 A
d.86.8 A
Giải thích
125% of nameplate FLA for an SF >=1.15 motor: 62 x 1.25 = 77.5 A. 62 A omits the factor, 71.3 A is 115%, and 86.8 A is 140% (the higher trip ceiling of 430.32(C), used only when the 125% device won't allow starting).
Trích dẫn luật: 2023 NEC §430.32Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- For the 50 HP, 460 V motor (FLC 65 A), what minimum branch-circuit conductor ampacity is required by NEC 430.22?
- For the 50 HP, 460 V motor (FLC 65 A), what is the maximum inverse-time circuit breaker per the 250% column of Table 430.52?
- For a continuous-duty three-phase motor rated more than 1 HP without integral overload protection, how many overload units are generally required?
- If the 125% overload device will not allow a 62 A (SF 1.15) motor to start, NEC 430.32(C) permits increasing the overload trip setting to a maximum of what value?
- Per NEC Table 430.248, what is the full-load current of a 2 HP, single-phase, 230 V motor?
- Using NEC Table 430.250, what is the full-load current of a 100 HP, 460 V, three-phase motor?
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