Equipment & SystemsQuestion 304 of 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
Explanation
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).
Law Reference: 2023 NEC §700.12Practice all 521 questions free — no signup required.
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