<P> An important consideration when designing fire alarms is that of individual zones . The following recommendations are found in BS 5839 Part 1: </P> <Ul> <Li> A single zone should not exceed 2,000 m2 in floor space . </Li> <Li> Where addressable systems are in place, two faults should not remove protection from an area greater than 10,000 m2 . </Li> <Li> A building may be viewed as a single zone if the floor space is less than 300m2 . </Li> <Li> Where the floor space exceeds 300m2 then all zones should be restricted to a single floor level . </Li> <Li> Stairwells, lift shafts or other vertical shafts (nonstop risers) within a single fire compartment should be considered as one or more separate zones . </Li> <Li> The maximum distance traveled within a zone to locate the fire should not exceed 60m . </Li> </Ul> <Li> A single zone should not exceed 2,000 m2 in floor space . </Li> <Li> Where addressable systems are in place, two faults should not remove protection from an area greater than 10,000 m2 . </Li>

A power plant fire alarm horn is which form of fire protection design