What is the term for a fire alarm system that operates independently of the building's power supply?

The term for a fire alarm system that operates independently of the building's power supply is a stand-alone system. This type of system typically includes battery-operated devices that can detect smoke, heat, or other fire indicators without relying on external power sources. This feature ensures that the system remains functional even during power outages, providing continuous fire detection and alerting capabilities.

Stand-alone systems are particularly useful in small buildings or individual rooms, where the complexity of a larger networked system is not necessary. Unlike monitored or addressable systems, which are interconnected and may require external power to function effectively, the stand-alone system’s independence from the building's electrical supply is a key advantage for ensuring safety at all times.