Type LD 1

System installed throughout the property, incorporating alarms in all circulation spaces that form part of the Escape Routes,
& all rooms excluding Bathrooms, Shower rooms & toilets, where a fire may start.

LD 2

System incorporating alarms in all circulation spaces that form part of the Escape Routes, & all rooms/areas excluding Bathrooms, Shower rooms & toilets, where a high risk of fire exists to occupants.

LD 3

System installed  incorporating alarms in all circulation spaces that form part of the Escape Routes.

• "L" Systems are for non domestic dwellings and involve Fire Panels not interconnected smoke + heat alarms
  Coverage L1 Systems
  On L1 Systems, all areas of the building should be covered. It is normal not to cover the following areas:
  WC's/Bathrooms unless they contain electric hand dryers
  Voids under 800mm in height
• Coverage L2 Systems
  Coverage of L2 systems depends on the vulnerability of the likely occupants and the probability of fires, ie:
  Bedrooms without supervision
  Areas having a high probability of ignition ie: day accommodation, store rooms, kitchens and plant rooms
  
• Where occupants are especially vulnerable due to illness, age or are unfamiliar with the building. It should be noted that L2 systems always include L3 coverage.
• Coverage L3 Systems
  In L3 systems, coverage should be provided for escape routes and any areas in which the occurrence of a fire would directly threaten escape routes. The following areas should therefore be covered:
  Corridors, passages and circulation areas
  Stairwells
  The top of vertical risers
  At each level within 1.5m of an access point to a lift shaft or other vertical riser
  In all rooms opening onto an escape route