L4 – an L4 System should have fire detectors installed in the corridors and stairways on the escape route.L5 should not be used as means of a variation to BS 5839. Manual Call Points do not need to be installed however, sounders are recommended throughout the building. For example, a single detector in a high-risk area – a boiler room – where, if a fire occurred, it could threaten the safety of occupants. L5 – an L5 System should have fire detectors installed based on a specific fire safety objective.This is the lowest permitted system for life protection. If a fire occurred, it would be identified by someone quickly and everyone would be evacuated before the escape routes were compromised. This would be used in buildings where people are not sleeping. M – an M System does not use automatic fire detection, instead relying on human intervention.
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