System for Protecting Property (P)
A satisfactory fire alarm system for the protection of property will automatically
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 to escape.
As a guide, an escape route may be considered blocked once visibility drops
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 that form

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)