Emergency voice/alarm communication systems must continue functioning after a loss of primary power for aminimum of 24 hours in standby, followed by15 minutes of alarmoperation.
NFPA 72 (2022), Section 10.6.7.2.1.1 (Exception):
“…followed by 15 minutes of alarm for emergency voice/alarm communication systems.”
This ensures that occupants can still hear evacuation messages even during a power outage.
Correct answer: D. Minimum of 15 minutes
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