If your building has a fire alarm system and/or a water-based fire protection system such as a sprinkler system, you may be required by the National Fire Protection Association (NFPA) 101 Life Safety Code (LSC) to implement a fire watch should that system become impaired.
ACCORDING TO THE NFPA
•A fire watch is required if the system is impaired for more than four hours in a 24-hour period. The fire department must be notified.
•Fire watches require the continuous patrol of all areas of the building affected by the impairment to look for evidence of smoke, fire, or any abnormal conditions.
•They must also know the location of all manual fire alarm stations and fire protection equipment available to them should they discover a fire.
•The fire watch must remain in effect until the entire system is restored to proper working order and only after any necessary inspections and tests have been conducted to verify that affected systems are operational, and the fire department has been notified.