In electrical manual release, what does the control monitor?

• A. Battery level of standby battery supply.
• B. Low battery signal.
• C. Control equipment monitors the battery voltage level of the standby battery supply and provides a low-battery signal.
• D. No battery monitoring.

Answer: (C)

In an electrical manual release system, the control is responsible for supervising the standby (backup) power that keeps the release circuitry operable if main power is lost. It continuously checks the voltage of the standby battery and, when that voltage drops below a set level, it issues a low-battery signal to warn that the battery may be unable to support a release if needed. This dual function—monitoring the actual battery voltage and providing a low-battery alert—ensures the system can be relied upon during a fire event and that maintenance is notified when the standby power is weakening. The other options miss part of this function or incorrectly state there’s no monitoring.