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Fire Protection – Fire Alarm Systems

Category M – Manual Systems e.g. Hand bells, gongs etc. These maybe purely manual or manual electric, the latter may have call points and sounders. This system relies on the occupants of the building discovering the fire and acting to warn others by manually operating the system.

Category P1 – This system has detection installed throughout the building, the objective of this system is to alert the Fire Brigade as early as possible to ensure minimal fire damage. Small low risk areas can be excluded, such as toilets and cupboards less than 1m².

Category P2 – Detection is installed in parts of the building which where the risk of ignition to high and/or the contents are particularly valuable.

Category L1 – An L1 system is designed for the protection of life and which has automatic detection installed throughout all areas of the building including roof spaces and voids with call points at all exits, the aim of this system is to provide the earliest possible warning.

Category L2 – L2 systems have automatic detection installed in all escape routes, rooms adjoining escape routes and high hazard rooms as well as call points at all exits. This system is designed to give early enough warning for escape before escape routes become blocked.

Category L3 – L3 systems have automatic detection installed in all escape routes, rooms that open into escape routes as well as call points at all exits. This system is designed to give early enough warning for escape before escape routes become blocked.

Category L4 – L4 systems have automatic detection in escape routes and circulation areas only as well as call points at all exits. This system is designed with the objective of protecting the escape route.

Category L5 – This is the ‘all other situations‘category, e.g. computer rooms which may be protected with an extinguishing system triggered by automatic detection. These systems are custom systems that relate to a special requirement that cannot be covered by any other category.

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