Thiết bị & Hệ thốngCâu 291 / 521
Per NEC Table 430.250, what is the full-load current of a 7.5 HP, 230 V, three-phase motor?
a.15.2 A
b.28 A
c.22 A
d.11 A
Giải thích
Table 430.250 lists 22 A for a 7.5 HP, 230 V three-phase motor. 15.2 A is 5 HP, 28 A is 10 HP at 230 V, and 11 A is 7.5 HP at 460 V.
Trích dẫn luật: 2023 NEC Table 430.250Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A feeder supplies three 460 V, three-phase motors: 25 HP (34 A), 15 HP (21 A), and 10 HP (14 A). Per NEC 430.24, what minimum feeder ampacity is required?
- Per NEC 430.62, the maximum feeder overcurrent device for several motors equals the largest branch-circuit protective device rating plus the sum of the other motors' FLCs. If the largest motor's branch device is 90 A and the other motors' FLCs total 35 A, what is the maximum feeder device?
- The equipment grounding conductor for a motor branch circuit is sized based on what, per NEC 250.122?
- For the 7.5 HP, 230 V motor (FLC 22 A), what minimum branch-circuit conductor ampacity is required by NEC 430.22?
- For the 7.5 HP, 230 V motor (FLC 22 A), what is the maximum nontime-delay fuse per Table 430.52 (300%)?
- When the Table 430.52 percentage produces a value that does not correspond to a standard fuse or breaker size, NEC 430.52(C)(1) Exception No. 1 permits you to:
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