System Design

When deciding on a new fire alarm system or an extension to an existing system, it is important to examine the risks and carefully consider the system design requirements. The question of detection quality and location are all factors of the design as is the design categories for protection of life laid down in the British Standard document: BS5839-1:2002.

An outline of the standards are broadly as follows:

M – Manual call points only.

L4 – Protection of escape routes.
The object of L4 is to enhance the safety of occupants by providing a warning of smoke when within the escape routes.

L3 As L4 but with added protection.
This applies to areas considered higher risk, such as electrical switch rooms, boiler rooms, kitchens, and other potentially hazardous areas.

L2 as L3 but with added detection.
Increased detection systems for areas considered higher risk, such as electrical switch rooms, boiler rooms, kitchens, and other potentially hazardous areas.

L1 The highest level of protection.
All rooms and areas to be covered to provide the highest possible level of cover to the occupants of the building.

Fire Alarm Warning Devises
Fire alarm sounders should be designed and positioned in such a way as to provide coverage to a level of sound of 65dba to all areas of the building. In general, 5dba above background noise (background noise of 60dba).

Note: sleeping areas need to achieve 75dba at the bedhead. It is also important to note that exceptionally loud devices can be harmful. Therefore there is a maximum level of 120dba.

Please feel free to contact us on: 0118 979 3534, by email at: info@phoenixdetection.co.uk or via the enquiry form on the contact us page if you have any questions or would like a no-obligation quotation.