When a required fire alarm system is out of service for more than 4 hours within a 24-hour period, the facility must notify the authority having jurisdiction and either evacuate the building or implement an approved fire watch for all unprotected occupants until the system is restored. This is a life-safety/fire protection requirement applicable to any facility subject to fire alarm system requirements.
View official sourceK346 Fire Alarm – Out of Service Where required fire alarm system is out of services for more than 4 hours in a 24 hour period, the authority having jurisdiction shall be notified, and the building shall be evacuated or an approved fire watch shall be provided for all parties left unprotected by the shutdown until the fire alarm system has been returned to service. 9.6.1.6