Thiết bị & Hệ thốngCâu 284 / 521
An HVAC nameplate specifies 'Maximum Fuse or HACR Breaker.' What does HACR indicate?
a.The breaker must be a GFCI type
b.The breaker must be rated for 100% continuous duty
c.Only fuses may be used, not breakers
d.The circuit breaker is rated/listed for heating, air-conditioning, and refrigeration group-motor applications
Giải thích
HACR-rated breakers are listed for heating, air-conditioning, and refrigeration equipment with group motor-compressor loads. The nameplate permits either a fuse or an HACR breaker up to the marked value; it does not mandate GFCI or fuses-only.
Trích dẫn luật: 2023 NEC §440.22Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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