Lập kế hoạch & Dự toánCâu 390 / 521
A continuous load (operating 3 hours or more) draws 16 A. What minimum overcurrent-device/conductor rating must serve it?
a.16 A
b.18 A
c.20 A
d.25 A
Giải thích
Continuous loads are multiplied by 125%: 16 A × 1.25 = 20 A. Sizing at the load itself (16 A) or by other factors does not satisfy the continuous-load rule, so 20 A is required.
Trích dẫn luật: 2023 NEC §210.20(A)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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