In the event of power failure, how many hours of backup power should public emergency alarm reporting system boxes provide?

In the event of power failure, how many hours of backup power should public emergency alarm reporting system boxes provide?

• A. 12 hours
• B. 60 hours
• C. 24 hours
• D. 120 hours

Answer: (B)

Public safety signaling equipment must keep functioning during power outages long enough to ensure alarms reach occupants and the monitoring system can report to responders. For public emergency alarm reporting system boxes, the required standby power duration is 60 hours. This length of backup power guards against short outages and typical delays in restoring electric service, so the reporting path remains active and life-safety alerts continue to operate until power returns or maintenance can be performed. The backup is provided by a dedicated battery power supply sized to deliver the necessary current for a full 60 hours, ensuring reliability even during extended outages. Shorter durations like 12 or 24 hours may not cover longer outages, while 120 hours would demand a much larger, more costly battery setup, which goes beyond the standard requirement.

Public safety signaling equipment must keep functioning during power outages long enough to ensure alarms reach occupants and the monitoring system can report to responders. For public emergency alarm reporting system boxes, the required standby power duration is 60 hours. This length of backup power guards against short outages and typical delays in restoring electric service, so the reporting path remains active and life-safety alerts continue to operate until power returns or maintenance can be performed. The backup is provided by a dedicated battery power supply sized to deliver the necessary current for a full 60 hours, ensuring reliability even during extended outages. Shorter durations like 12 or 24 hours may not cover longer outages, while 120 hours would demand a much larger, more costly battery setup, which goes beyond the standard requirement.