Thiết bị & Hệ thốngCâu 296 / 521
A small single-phase motor has a nameplate FLA of 14 A, service factor 1.0, no marked temperature rise. What is the maximum overload device rating under NEC 430.32(A)(1)?
a.14 A
b.17.5 A
c.15.4 A
d.16.1 A
Giải thích
Without a 1.15+ SF or <=40C rise marking, overload is limited to 115% of nameplate: 14 x 1.15 = 16.1 A. 125% (17.5 A) applies only to qualifying motors, 15.4 A is 110%, and 14 A applies no factor.
Trích dẫn luật: 2023 NEC §430.32Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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