The following recommendations are applicable when designing fire alarm systems in accordance with BS5839-1.
If a fire alarm manual call points are located on the landings of an enclosed stairway the fire alarm manual call point on each level, other than a final exit level from the stairway, should be incorporated within the zone that serves the adjacent accommodation on that level.
A fire alarm manual call point located within the stairwell at a final exit to open air may be incorporated within the fire detection zone serving the stairwell.
When designing a fire alarm system, If the total floor area of the building is greater than 300 m2, each fire detection zone should be restricted to a single storey.
If the total floor area of the building is less than 300 m2 a fire detection zone may cover more than a single storey.
For voids above or below the floor area of a room, these may be included within the same fire zone of the room, provided that the voids and the room constitute a single fire compartment.
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