Fire detection and fire alarm systems are usually installed in dwellings to protect life. However, the level of fire protection afforded to occupants needs to be related to the fire risk involved. The appropriate level of protection required can therefore vary considerably. For the purposes of this standard BS5839-6, fire systems are classified as follows, according to the level of fire protection that they afford.
Category LD: a fire detection and fire alarm system intended for the protection of life.
NOTE 1: The designation “LD” is used to distinguish these fire alarm systems, which are intended only for dwellings, from Category L systems as defined in BS 5839-1, which are intended for the protection of life in any type of building.
Category LD systems are subdivided into:
Category LD1: a fire system installed throughout the dwelling, incorporating smoke detectors in all circulation spaces that form part of the escape routes from the dwelling, and in all rooms and areas in which fire might start, other than toilets, bathrooms and
shower rooms;
Category LD2: a system incorporating smoke or heat detectors in all circulation spaces that form part of the escape routes from the dwelling, and in all rooms or areas that present a high fire
risk to occupants .
Category LD3: a system incorporating smoke detectors in all circulation spaces that form part of the escape routes from the dwelling.
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