General Guidelines to Fire Alarm Categories

There are 2 Different Types of Category;

LD ; Domestic Dwellings

This relates to a domestic mains powered, interlinked smoke detectors which have no central panel or control unit;

LD1 is a system which has detection in all areas including voids and attics

LD2 is a system which has detection in all circulation spaces that form part of the escape routes from the premises, and in all rooms or areas that present a high risk of fire to occupants

 

L; Non Domestic; Commercial, Child Care (above a certain size) Care Homes, Hotels, Healthcare, Multi – Occupancy Units

  • L1 Category – Detection provided throughout the entire premises including attics & voids. This is usually required for residential care homes, Hotels, Hospitals

 

  • L3 Category – Detection provided on all escape routes and adjoining areas

 

  • L2/L3 Category – Detection provided on all escape routes and adjoining areas, as well as additional detection in specified high risk areas and circulation routes. This is the most common Fire Alarm category and is used in most commercial premises.

 

  • L4 Category – Detection provided on all escape routes only. This would be used normally where a risk assessment has been carried out and this has been deemed adequate.

 

  • L4/L2 Category – Detection provided on all escape routes and additional detection in specified high risk areas such as circulation routes.

 

  • L3X Category– Used in multi – occupancy dwellings (flats, apartments, bedsits linked by an enclosed stairwell / corridor) This system comprises of a heat detector inside each apartment, smoke detectors on all escape routes. Usually there is a separate LD (Domestic) system in each apartment also.

 

These are general guidelines and do not deal with specifics such as positioning of Sounders or Manual Call Points. If you have specific queries, please call us and we would be happy to discuss your requirements

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