Fire Alarms and Detection
Fire Action Ltd supply, install and maintain a wide range of fire detection and fire alarm systems to meet all fire safety ...more
Fire Extinguishers
Tackling a small fire with a fire extinguisher may make the difference between a small incident and a full scale disaster ...more
Fire Risk Assessment
In May 2004 the Regulatory Reform (Fire Safety) Order was laid before Parliament for review and process ...more
Fire Safety Training
The best way to prevent a fire is by training your staff to be fire aware and you are legally required to provide adequate training ...more
Addressable Systems
Several changes to circuit design have been introduced into the code of practice brought about mainly by the inclusion of addressable systems. The code puts a limit on the size of the circuit which can be used, to limit the amount of protection which would be lost if a fault or faults occur. A single fault should not remove protection from an area greater than that allowed for a single zone and must not prevent the operation of other zones.
In a conventionally zoned system this should not happen as the zones are wired on separate circuits. However, in an addressable system several zones may be connected to the control panel by a single looped circuit.
To achieve this in an addressable system, short circuit isolators are used to protect suitable areas of the circuit.
Maximum area covered by one loop is 10,000 sq m.
The code retains the use of zones to indicate the origin of a fire. In addressable systems, the detector or manual call point in alarm can be shown by the use of an alpha numeric display. This on its own will not be acceptable and the zone in which the detector/manual call point has operated must be displayed.
The zonal indication may be mounted adjacent to the control panel and as the code also requires a plan of the building to be displayed, the use of a mimic diagram would seem to be the most suitable means for zone identification.
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