Thiết bị & Hệ thốngCâu 242 / 521
Per NEC Table 430.248, what is the full-load current of a 5 HP, single-phase, 230-volt motor?
a.56 A
b.28 A
c.17 A
d.40 A
Giải thích
Table 430.248 gives 28 A for a 5 HP single-phase 230 V motor. 56 A is the 115 V value for the same HP, 17 A is a 3 HP 230 V single-phase motor, and 40 A is a 7.5 HP 230 V motor.
Trích dẫn luật: 2023 NEC Table 430.248Luyện 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?
- 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?
- 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?
- 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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