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Auxiliary supervising station fire alarm systems are either local energy or shunt-type, as mentioned previously. There will be specific design restrictions for shunt-type systems.
Coded radio boxes can’t be used on shunt-type systems, and connection of automatic detection devices is not allowed. Shunt-type auxiliary system transmitters are limited to 100,000 square feet of protected spaceA separate transmitter is always required for each building, or each separate group of buildings that do not exceed 100,000 sq. ft. total as long as the building is under single ownership or occupancy. per transmitter.
If the fire alarm box is located at the entrance to the facilityThe intent is to allow access to the box. Because there is the potential to have a fault that can impair the entire public reporting system, and the circuit runs into the protected premises where the fault could occur, mounting the box outside allows access to the box without having to enter the building., the shunt-type box can be used for the public fire alarm reporting system also. The system has to be arranged so that a single fault doesn’t jeopardize the public fire alarm system. Further, in the case of a single fault on the auxiliary system, the system can’t transmit a false alarm.
© Hughes Associates,Inc. 2012