Thiết bị & Hệ thốngCâu 305 / 521
A legally required standby system must restore power to its loads within what maximum time after normal supply is lost?
a.10 seconds
b.30 seconds
c.60 seconds
d.120 seconds
Giải thích
Section 701.12 requires that a legally required standby system supply its loads within 60 seconds of a normal-supply failure. The 10-second figure applies to true emergency systems (Article 700), which serve life-safety loads that need faster restoration.
Trích dẫn luật: 2023 NEC §701.12Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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