Thiết bị & Hệ thốngCâu 282 / 521
An HVAC nameplate lists MCA = 27.5 A and MOCP = 45 A. What is the minimum ampacity the branch-circuit conductors must have?
a.45 A
b.27.5 A
c.22 A
d.35 A
Giải thích
Conductors must have an ampacity at least equal to the MCA (27.5 A); the MOCP (45 A) is the maximum overcurrent device, not the conductor ampacity. Sizing conductors to 45 A would be oversized/incorrect, and 22 A is below the required MCA.
Trích dẫn luật: 2023 NEC §440.4Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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