About the product
conventional manual call point
FIRE ALARMS
The system
Fire alarm systems are designed to respond to a condition of smoke/heat in a building. The system has two main functions (a) protect life within the building (Category L) and (b) protect the building and its contents by summoning the Fire Brigade at the earliest opportunity (Category P).
Control panel
The ‘brain’ of the system. The system will normally be either ‘conventional’ ie wired in zones or areas, or ‘addressable’ ie every device has an electronic ‘address’. Conventional systems tend to be cheaper but problems can be difficult to identify. The panel wil receive signals from the devices – callpoints, detectors etc and then either signal a ‘fault’ (beeping on the panel) or ‘fire condition’ (the bells/sounders all activate).
Callpoints (or Break Glass Units)
The familiar red box on the wall. In the event of a fire a person would break the glass in the unit which in turn activates the fire alarm. Most commonly found in the exits from a building.
Detectors – smoke
Many fire systems are ‘manual’ ie people are the detectors, if they discover a fire they should operate a callpoint. However for protection when people may not be around eg evenings and weekends, detectors are often used, mostly either smoke or heat. Smoke detectors are activated by smoke but can be prone to false alarms as they often cannot distinguish between smoke, hair spray, dust, insects or water.
Detectors – heat
Heat detectors are most commonly found in kitchens, boiler rooms or unclean environments where there is a risk of normal smoke, dirt etc triggering a false alarm.
Sounders or bells
The ‘warning’ device to alert occupants to a fire . Can be supplemented by visual alarms ( flashing beacons ) where areas can be noisy i.e. factories or DDA compliance. Normally the sound level is required to at least 65 decibels.
False alarms
The cause of most fire alarms is not fire. Causes can be accidental (bumping into a callpoint, someone spray painting, sawing/sanding wood, or welding too close to a detector), unintentional (dust/insects or a detector too close to a kitchen area), mechanical (malfunctioning system, an electrical storm, or a faulty wire), or malicious (intentionally setting off the alarm). These cause a huge drain on fire brigade resources and good design is essential.
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