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Back Box

The cabinet/box in which control panel equipment or devices are mounted. Back boxes may be installed on the wall surface, flush into the wall, or semi-flush to the wall.


A secondary energy source for the fire alarm system which ensures operability in the case of primary AC power failure.

Battery Charger

An integral power supply element which maintains the batteries at a constant charge level in normal operating mode under primary AC power.

Battery Time

The period of time for which the batteries must fully support the operation of the system equal to the specified Alarm Time plus the specified Supervisory Time, as determined by the local jurisdiction.

Beam Detector

In a projected beam detector, light is transmitted and monitored between a source and a photosensitive receiver. When smoke particles are introduced in the light path, some of the light is scattered and some absorbed, thereby reducing the intensity of the light reaching the receiver, causing the detector to activate.

Building Management System

An integrated computer system for monitoring and controlling various aspects of a building’s operation including heating, lighting, air conditioning, etc.


This is an electromechanical noise-making device. A clapper is moved electromechanically to strike the bell and produce a loud ringing sound.

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