Thiết bị & Hệ thốngCâu 304 / 521
An emergency system must make power available to the required loads within what maximum time after normal power is lost?
a.10 seconds
b.60 seconds
c.2 minutes
d.Immediately, with no delay permitted
Giải thích
Section 700.12 requires that current supply to emergency loads be available within 10 seconds of the failure of the normal supply. Sixty seconds is the limit for legally required standby systems under Article 701, and no time limit is given for optional standby (Article 702).
Trích dẫn luật: 2023 NEC §700.12Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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