System Sensor BS5839 manual - page 9

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Note: This document is based on the recommendatio ns of BS5839 Part 1: 2002. I t is intended only as a guide to the ap plication of fire detection systems.
Reference must be made to relevant national and local stan dards.
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Category L2: Objective s are similar to category L3, however
additional protection is provided f or rooms at higher risk.
Protection should be as for categor y L3 plus smoke detectors
in specified rooms at high risk
Category L1: The highest category for t he protection of life.
Intended to give the earliest possible no tification of a fire in
order to allow maximum time for evacuation. Au tomatic and
manual fire detection installed thro ughout all areas of the
building. Smoke detectors should be employed w herever
possible to protect rooms in which peopl e can be expected to
be present.
Similarly to class M systems, all alarm signal s given in
a category L system must be suffic ient to warn all those
people for whom the alarm is intended to allow fo r a timely
evacuation.
2.1.3. Category P Systems
Category P systems are automatic fi re detection systems
whose primary objective is to protec t property. The categor y
is subdivided as follows:
Category P2: Intended to pr ovide early warning of fire
in areas of high hazard, or to protect hig h-risk property.
Automatic fire detection should be ins talled in defined areas
of a building.
Category P1: The objective of a catego ry P1 system is to
reduce to a minimum the time from the ignition of a fir e to
the arrival of the fire brigade. In a P1 syste m, fire detectors
should be installed throughout a building .
In a category P system, unless combined wi th category M, it
may be adequate for alarm signals simply to allow fire fi ghting
action to be taken, for example a signal to aler t a responsible
person to call the fire brigade.
Application Guide
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