Question

what is the principle of fire alarm

Answer 1

These outputs are typically for the purpose of warning occupants on a fire alarm signal, notify the fire brigade, control the spread of heat, smoke or fire; or used for a wide variety of other purposes. ... In fire alarm terms this generally means the wiring connecting one or more detectors to the fire panel.

Answer 2

The Automatic Fire Alarm works on the Principle of Thermal Expansion ( of solids ) of the Bimetallic Strip.

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