Domestic Fire Alarms Categories

It is a recommendation by BS 5839: Pt.6: 2013 that a new build property with no more than 3 floors (less than 200sqm per floor) needs to be fitted in with a LD2 System , Grade D.

In Scotland, England and Wales. Building Regulation has recommended that BS 5839: PT6.should only be followed as a minimum. LD1 System, Grade D should be installed.

In Northern Island Building Regulations have stated that a LD2 system, Grade D should be installed. Escape routes, the kitchen and then main living room should be installed with Smoke Alarms.

The BS 5839: Pt.6. gives out grades to different alarm types to help define which alarm type is needed for a situation.

LD2 refers to the number of alarms to be fitted in the property. There are three categories to domestic type protection, LD2 being one of the three. Below are Diagrams and an explanation of the three categories and how and where you would use them in a single and multi storey dwelling. LD3 is the system with the least protection and LD1 being the highest.

Grades

A system of detectors and sounders with control and indicating equipment - CIE (E.g. A Panel or Call points) is categorised as Grade A

This grade is nearly the same as Grade A but with some minor changes. This is categorised as Grade B

Smoke Alarms, Detectors or sounders with some control features is categorised as Grade C

Smoke and/or Heat Alarms, mains powered with suitable battery back up is categorised as Grade D

Smoke and Heat Alarms (Mains Only) is categorised as Grade E

Smoke and Heat Alarms (Battery only) is categorised as Grade F

The minimum grade is a grade D for domestic fire alarm systems this will mean that all new builds will need a heat or smoke alarm with battery back up to meet the current requirements..

Key:
Heat Alarm Ionisation or Optical Alarm Optical Smoke Alarm Ionisation, Optical or Heat Alarm
Do not fit alarm
Single Storey
Multi Storey

LD3 Fire Alarm System – Minimum Protection

Hallways, Stairways and circulation areas that form areas of the escape routes from the house should be protected by smoke alarms. Smoke alarms should be located on each storey every 7.5m of hallways and escape routes and within 3m of all bedroom doors (apart from toilets and bathrooms)
Single Storey
Multi Storey

LD2 Fire Alarm System – Additional Protection:

Hallways, stairways and circulation areas that form part of the escape routes from the house should be protected by smoke alarms. In addition, Smoke or heat alarms should be fitted in all rooms or areas that present a high risk to occupants. Smoke alarms are on each storey within every 7.5m of hallways and escape routes and within every 3m of all bedroom doors (apart from toilets and bathrooms). Heat Alarms located in each kitchen (Heat Alarms must be within 5.3 metres of potential fire sources). Smoke or Heat alarms located in each living room (I.e. most frequently used daytime room)
Single Storey

Multi Storey

LD1 Fire Alarm System – Maximum Protection

Smoke alarms are located in all hallways, stairways and circulation areas that form part of the escape routes from the house. Smoke or heat alarms are in all rooms or areas that present a high risk to occupants and also should be place in all other rooms. Smoke alarms are on each storey within every 7.5m of hallways and escape routes and within every 3m of all bedroom doors (apart from toilets and bathrooms). In all other rooms and areas other than what is listed next. Heat Alarms are located in each kitchen and garages (Heat Alarms must be within 5.3 metres of potential fire sources). Smoke or Heat alarms are located in each living room (I.e. most frequently used daytime room).
: Empty