Fire-Alarm System

a system of devices for detecting a fire and reporting its location. A fire-alarm system includes fire detectors, receiving equipment, communication lines, and power packs. Fire detectors are devices that transmit an electric fire-alarm signal to a fire station. They can be switched on manually and can automatically react to the heat, smoke, or light of a fire. The fire-alarm system receives signals from fire detectors and indicates the source of the signal according to a numerical code. It acoustically signals that it has received an alarm signal, switches on automated fire protection equipment by remote control, and alerts the fire station. Fire detectors may be part of a protective system, in which case the system is called a protective fire-alarm system.