What minimum backup battery capacity must a fire alarm system have to monitor the premises?

What minimum backup battery capacity must a fire alarm system have to monitor the premises?

• A. 12 hours
• B. 18 hours
• C. 36 hours
• D. 24 hours

Answer: (D)

The essential idea is that fire alarm systems must stay operating on backup power for a full day while mains power is out. The requirement is to have standby capability for 24 hours so the system can continue monitoring the premises and communicating with the monitoring station without relying on AC power. Shorter durations wouldn’t meet this minimum standard, while longer durations are allowed but unnecessary for the question asking for the minimum.

The essential idea is that fire alarm systems must stay operating on backup power for a full day while mains power is out. The requirement is to have standby capability for 24 hours so the system can continue monitoring the premises and communicating with the monitoring station without relying on AC power. Shorter durations wouldn’t meet this minimum standard, while longer durations are allowed but unnecessary for the question asking for the minimum.