Thiết bị & Hệ thốngCâu 293 / 521
For the 7.5 HP, 230 V motor (FLC 22 A), what is the maximum nontime-delay fuse per Table 430.52 (300%)?
a.66 A
b.55 A
c.38.5 A
d.176 A
Giải thích
Nontime-delay fuse: 300% of FLC = 22 x 3.00 = 66 A. 55 A is 250% (inverse-time breaker), 38.5 A is 175% (dual-element fuse), and 176 A is 800% (instantaneous trip).
Trích dẫn luật: 2023 NEC §430.52Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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