Fire Alarm Systems
We are fire alarm engineers whose aim is to provide you with the most appropriate fire alarm systems to meet your particular needs.
Our aim is to protect your people and property with the system most relevant to your needs.
Fire alarm systems need to be designed for your specific needs depending upon your premises, type of business and fire risk.
We provide a full range of fire alarm systems from simple conventional panel to highly sophisticated addressable systems. We can also provide radio controlled systems where surface cabling is not acceptable; for example, historic buildings.
We have a comprehensive understanding of British Standards and can offer advice to our clients as to what is required to make the system compliant.
Different categories of protection BS5839
Category M: Manual – No automatic fire protections system.
Category L1 – L5: Automatic fire protection system intended for the protection of life.
Category P1 & P2: Automatic fire protection systems intended for the protection of property.
The objective is to summon the fire brigade in the early stages of fire.
-P1 is property detection where automatic detector is installed throughout the building.
-P2 is property detection where automatic detection is in designated areas only.
The objective is to protect people from loss of life and injury.
Control equipment should be generally accessible on the ground floor, next to the entrance of the building to enable the occupier and the fire brigade to identify the zones in fire.
A plan of the building should be displayed close to the panel, showing entrances, escape routes and zones.
Callpoints should be fitted in conspicuous and easily accessible points on escape routes, mounted at 1.4 metres above floor level.
Callpoints should be located at the exits to the open air and to exits on each floor.
The distance between callpoints should not be more than 30 metres or 16 metres where people have limited mobility.
There are different types of detectors:
- Optical Smoke Detectors
Optical smoke detectors operate on the principle of infra-red light refracting off small particles entering the chamber. This type of detector is more sensitive to smouldering fires.
- Ionisation Detectors
Ionisation detectors work on the principle of charred smoke particles passing between two electrodes, causing a small current flow. This detector is more suitable for detecting fast flaming fires. Due to the European Directives for the storage and transport of radio-active resources, ionisation detectors are becoming less favourable and are being replaced by multi-sensors.
- Heat Detectors
Heat detectors can be:
- Rate of rise: This responds to a sudden increase in temperature but also has a fixed element in case of small smouldering fire (fixed temperature up to 90 degrees).
- Fixed temperature: This has a sensing element, fixed at a particular temperature. When this is reached, the detector operates. This is ideal for kitchen and boiler rooms.
If there is a void greater than 800mm, then fire detection should be provided in the void. Void detectors are also required if fire/smoke can spread between rooms before detection.
Placing of detectors
Smoke detector has a radius of 7.5m
Heat detector has a radius of 5.3m.
Each detector should have a clear space below and around the detector of 500mm.
The detector should be 1m away from air conditioning units.
All sounders should emit similar sound to avoid confusion. (Bells and sounders should not be mixed).
A minimum of 65dB is required in general areas. Where high noise levels exist, visual indication such as strobes should be installed.
Disabled person toilets are required to be fitted with visual alarm devices.