What is the required duration of the secondary power supply for operation of the system's detection, signaling, control, and actuation?

What is the required duration of the secondary power supply for operation of the system's detection, signaling, control, and actuation?

• A. 8-hour
• B. 24-hour
• C. 48-hour
• D. 72-hour

Answer: (B)

The question focuses on how long the system must run on its secondary power during a power outage to keep detection, signaling, control, and actuation functioning. The required endurance is 24 hours. This ensures life-safety operations can continue for a full day if main power is lost, allowing time for power restoration or for a generator to take over while keeping alarms, indicators, and control devices active. An 8-hour duration would be insufficient for typical outage scenarios, while 48-hour or 72-hour durations exceed the minimum standard and add unnecessary cost.

The question focuses on how long the system must run on its secondary power during a power outage to keep detection, signaling, control, and actuation functioning. The required endurance is 24 hours. This ensures life-safety operations can continue for a full day if main power is lost, allowing time for power restoration or for a generator to take over while keeping alarms, indicators, and control devices active. An 8-hour duration would be insufficient for typical outage scenarios, while 48-hour or 72-hour durations exceed the minimum standard and add unnecessary cost.