Thiết bị & Hệ thốngCâu 317 / 521
Transfer equipment used for an emergency system must be what?
a.Automatic and listed for emergency use
b.A manual knife switch
c.Any general-use switch rated for the load
d.A molded-case circuit breaker only
Giải thích
Section 700.5 requires transfer equipment for emergency systems to be automatic, identified for emergency use, and approved by the authority having jurisdiction. A manual knife switch or ordinary general-use switch cannot meet the automatic-transfer and listing requirements for life-safety loads.
Trích dẫn luật: 2023 NEC §700.5Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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