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NOTE: This is an unformatted excerpt from our online fire protection training library.

Auxiliary Fire Alarm Systems

Auxiliary Systems

Coded Boxes

The fire alarm box that transmits signals to the auxiliary station alarm receiving point will be a coded box.  Master and auxiliaryDo not get these confused with telephone boxes. Telephone boxes have replaced publicly accessible “street” boxes in many communities. However, telephone boxes are not connected to a protected premises, and are never part of an auxiliary station system. They are simply manual street fire alarm boxes. fire alarm boxes used today are either going to be wireless boxes (using radio), or boxes connected to a wired system.

Coded wire boxes initiateThey operate by using a spring-wound mechanical clock-like movement that turns a code wheel. Teeth cut into the code wheel open the circuit on a predetermined pattern. Typically, the code is transmitted four (4) times, each time being a revolution of the code wheel. a coded signal from the box by interrupting the current flow through the wired circuit.  

A coded radio box operates on a designated radio frequency, assigned by the Federal Communications Commission (FCC). When actuated, the radio box transmits a radio signal that identifies the location of the box and may pass multiple signalsSome of the transmissions may not be fire related. at the same time.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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