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

Auxiliary Fire Alarm Systems

When a Type A system is required, automatic electronic re-transmission of incoming alarm signals is permitted but not required. If automatic re-transmission is permitted, there has to be automatic receipt, storage, retrieval, and re-transmission of the alarms received in the order received.  Also, the operator at the facility has to have the ability to immediately override the automatic re-transmission and revert to manual re-transmission of the alarm signals.

Type A systems are meant to be used with manual transmission of the alarm signals, in a fashion that sends the alarm signals to selected fire stations in the city. In a Type B system, this is not the case, and Type B systems automatically re-transmit the alarm signal to all fire stations in the community. 

In a larger city like New York or Chicago, the intent of the Type A system requirement is to limit the alarm assignments coming from the receiving station to only those fire stations that need to respond or know that the alarm has been transmitted. It would be ludicrous to send every fire alarm signal to all of the fire stations in New York City every time a fire alarm was transmitted from a protected premises. In a smaller community, however, it is likely that all fire stations need to be notified simultaneously.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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