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

Auxiliary Fire Alarm Systems

Coded Wire Systems

Type B Systems

In a Type BA Type B system is one with less than 2,500 alarm signals retransmitted through the system per year. system, non-interference and succession featuresA Type B system repeats signals from one box or alarm circuit onto the other box or alarm circuits in the system. The repetition of these signals causes other connected boxes to see a busy signal and wait for a clear circuit path before they can transmit. This provides for the proper non-interference and successful signal transmission once a signal is initiated through the box. between circuits can be no less than between boxes in any circuit.

If a metallic circuit is disabled, a warning signal is transmitted through all of the other connected circuits. The unaffected circuits must keep their transmission capability and continue to operate normally.

If the wired circuits are above ground, box circuits have to be arranged Geography, population, and building density are important factors considered when laying out a box system using metallic conductors. It is wise to limit the exposure to densely inhabited areas, so that there is not a large geographic area left without protection. so that only 20 boxes on a circuit can be out of service at any one time. If the system uses buried conductors, the number is increased to 30.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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