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

Auxiliary Fire Alarm Systems

Signal Receiving

Visual Recording

Box alarms have to be automatically received and recorded at the public communications center. Permanent graphic recordingReserve recording equipment has to be provided based on the number of recording devices and circuits used. If there is an individual dedicated recording device for each circuit, reserve devices have to be kept so that there are at least 5% spares in the station. But there can never be less than one spare regardless of how small the receiving station. In receiving stations that have common recorders connected to multiple circuits, a reserve device is provided on-site for each circuit connected to a common recorder. For example, let's assume that a large-city system has over 120 circuits serving 2,500 boxes. The circuits connect to seven circuit recorders, and each can handle up to 20 circuits. The city has to maintain 20 individual circuit recorders. If the multiple-circuit recorder fails, the switching equipment allows the 20 circuits connected to the failed multiple circuit recorder to be transferred to the reserve recorders. of all signals received and/or re-transmitted has to be provided for all alarm and tie circuits.

A permanent visible record and an audible signal are required to indicate alarm receipt from the alarm box transmitting the signal. The audible signal can be common to multiple box circuits, and it has to be arranged for silencing.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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