5 Dollar Traffic School Practice Exam

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According to NFPA 72, how long must the secondary power supply (batteries) operate a fire alarm system in standby mode before providing at least 5 minutes of alarm power?

12 hours 24 hours 48 hours 72 hours

Correct Answer:

24 hours

Explanation:

NFPA 72 requires secondary power supplies to operate the system for 24 hours under quiescent load, followed by 5 minutes of alarm operation.

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