System for Protecting Property (P)
A satisfactory fire alarm system for the protection of property
detect a fire at an early stage, indicate its location and
raise an effective alarm in
time to summon the fire-fighting forces (both resident staff
and the fire brigade).
Type P1 - A system covering all parts of the premises.
Type P2 - A system covering only those parts of a building
having a high fire risk.
Systems for Protecting Life (L, M)
A satisfactory fire alarm system for the protection of life
can be relied upon to
sound a fire alarm while sufficient time remains for the occupants
As a guide, an escape route may be considered blocked once
below 10 metres.
Type L1 - A system covering all parts of the premises
Type L2 - A system covering only those parts of a building
where there is a high risk to life if there is fire any where
in the building.
Type L3 - A system covering only areas critical to
free passage along escape routes.
Type M - A system that provides only for manual initiation
of an alarm and therefore depends on the presence of people.
LD1: Detectors installed in all circulation spaces
(e.g. hallways and staircases) and in all rooms and areas
in which fire might start.
kitchens etc, that are unsuitable for smoke alarms; should
have heat detectors installed.
LD2: Detectors installed in all circulation spaces
LD3: Single detector protection as the minimum standard
of protection for those
single-family dwellings in which smoke alarms are suitable,
it should be stressed that the Standard recommends the installation
of additional smoke alarms (so providing LD2, or in some cases
even LD1, protection)