According to NFPA 72, a separate storage battery and automatic charger should be provided for which purpose?

According to NFPA 72, a separate storage battery and automatic charger should be provided for which purpose?

• A. Starting the engine-driven generator
• B. Powering the building lighting
• C. Powering the door control system
• D. Charging the battery in the smoke detector

Answer: (A)

The main idea is that NFPA 72 requires an independent power source dedicated to starting the emergency standby power for the fire alarm system. To guarantee the generator can start automatically when normal power is lost, there is a separate storage battery with its own automatic charger just for cranking the engine-driven generator. This setup keeps the starting function isolated from other loads, so a failure to start won’t be caused by depletion from lights, door controls, or detector battery charging. The other options aren’t the focus of this requirement. Building emergency lighting is powered from emergency power, but its start isn’t the reason for a separate battery specifically for the engine starter. Door control circuits may be powered by the system’s standby power after a loss of power, but they don’t necessitate a dedicated starting battery. The battery inside the smoke detector is typically charged by the detector’s own power path and doesn’t require a separate charger for starting an engine.

The main idea is that NFPA 72 requires an independent power source dedicated to starting the emergency standby power for the fire alarm system. To guarantee the generator can start automatically when normal power is lost, there is a separate storage battery with its own automatic charger just for cranking the engine-driven generator. This setup keeps the starting function isolated from other loads, so a failure to start won’t be caused by depletion from lights, door controls, or detector battery charging.

The other options aren’t the focus of this requirement. Building emergency lighting is powered from emergency power, but its start isn’t the reason for a separate battery specifically for the engine starter. Door control circuits may be powered by the system’s standby power after a loss of power, but they don’t necessitate a dedicated starting battery. The battery inside the smoke detector is typically charged by the detector’s own power path and doesn’t require a separate charger for starting an engine.