Thiết bị & Hệ thốngCâu 244 / 521
A motor's nameplate shows a full-load current of 40 A and a service factor of 1.15. Under NEC 430.32(A)(1), what is the maximum overload device rating at 125% of nameplate FLA?
a.40 A
b.44 A
c.46 A
d.50 A
Giải thích
For a motor with a marked service factor of 1.15 or greater, 430.32(A)(1) permits overload protection up to 125% of the nameplate FLA: 40 x 1.25 = 50 A. 44 A is 110%, 46 A is 115% (used only for other motors), and 40 A applies no multiplier.
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
- Using NEC Table 430.250, what is the full-load current (FLC) of a 10 HP, three-phase, 460-volt squirrel-cage motor?
- Per NEC Table 430.248, what is the full-load current of a 5 HP, single-phase, 230-volt motor?
- A single continuous-duty 25 HP, 460 V, three-phase motor has an FLC of 34 A (Table 430.250). What minimum conductor ampacity is required for its branch circuit?
- For a 20 HP, 460 V, three-phase motor (FLC 27 A), what is the maximum inverse-time circuit breaker rating for branch-circuit short-circuit and ground-fault protection, using the 250% value of Table 430.52?
- Using the same 20 HP, 460 V motor (FLC 27 A), what is the maximum dual-element (time-delay) fuse permitted by Table 430.52 for branch-circuit short-circuit and ground-fault protection?
- A 5 HP, 230 V, three-phase motor has an FLC of 15.2 A. What is the maximum nontime-delay fuse permitted by Table 430.52 for branch-circuit protection?
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