Smoke Alarm User Manual

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Note: This document is based on the recommendations of BS5839 Part 1: 2002. It is intended only as a guide to the application of fire detection systems.
Reference must be made to relevant national and local standards.
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Category L2: Objectives are similar to category L3, however
additional protection is provided for rooms at higher risk.
Protection should be as for category L3 plus smoke detectors
in specified rooms at high risk
Category L1: The highest category for the protection of life.
Intended to give the earliest possible notification of a fire in
order to allow maximum time for evacuation. Automatic and
manual fire detection installed throughout all areas of the
building. Smoke detectors should be employed wherever
possible to protect rooms in which people can be expected to
be present.
Similarly to class M systems, all alarm signals given in
a category L system must be sufficient to warn all those
people for whom the alarm is intended to allow for a timely
evacuation.
2.1.3. Category P Systems
Category P systems are automatic fire detection systems
whose primary objective is to protect property. The category
is subdivided as follows:
Category P2: Intended to provide early warning of fire
in areas of high hazard, or to protect high-risk property.
Automatic fire detection should be installed in defined areas
of a building.
Category P1: The objective of a category P1 system is to
reduce to a minimum the time from the ignition of a fire to
the arrival of the fire brigade. In a P1 system, fire detectors
should be installed throughout a building.
In a category P system, unless combined with category M, it
may be adequate for alarm signals simply to allow fire fighting
action to be taken, for example a signal to alert a responsible
person to call the fire brigade.
Application Guide
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