Qualified and experienced
What we do
Specialists in Fire Alarm Servicing, Maintenance and Repairs.
Servicing and Maintenance
A fire alarm system is there for your safety and wellbeing. One of the first stages in fire alarm system design is to divide the property into precise areas, or detection zones. These zones should be marked on or close to your fire alarm panel. If not please ask our engineer who will be more than happy to prepare a zone chart for you.
This is a fairly straight forward process so long as the following criteria is adhered to.
- A zone should not extend beyond a single fire compartment.
- The floor area of a zone should not exceed 2000m2 or (10000m2 for analogue/addressable systems using short circuit loop isolators on a single closed loop).
- A zone should not extend beyond a single floor area, therefore each floor level in a building will constitute at least one zone.
- As an exception to the above, stairwells, lift shafts and other vertical shafts should be designated as an individual zone.
- Small premises with multipul floor levels not exceeding an area of 300m2 in total may be considered as a single zone.
- The search distance in a zone should not exceed 30m from point of entry, i.e. that distance which needs to be travelled for a searcher to visually establish the position of the fire. This can be made less complex with the use of remote indicators removing the necessity to open every door and inspect each room in a zoned area.
AUTOMATIC FIRE DETECTION
The various types of heat and smoke detectors are summerised as follows.
- OPTICAL (photoelectric) type smoke detectors normally provide the best method of smoke detection in stairwells, corridors and sleeping areas. This is because they are designed to detect large smoke particles that can be expected in such areas from smouldering and developing fires.
- HEAT detectors are best suited to areas where clean burning or flaming fires might be expected. In addition they are also suitable for storerooms, plant rooms and where the presence of smoke or steam is usually encountered under normal conditions. (e.g. kitchens and hallways next to shower units, garages etc). Heat detectors are also used if there is a high level of airborne contamination from dust or pollen.
- RATE-OF-RISE heat detectors will detect an abnormally rapid heat build up that might be expected to occur under fire conditions in factories and shops etc.
- FIXED TEMPERATURE heat detectors will operate only when their rated temperature is exceeded so kitchen areas, boiler rooms and hot industrial environments will utilise this type of detection.
- It is important to take all of the points into account so that the optimum detector choice is made to ensure that adequate detection is provided with the minimum risk of false alarms.
What is important to understand is where heat detectors are sometimes prefered to prevent a false alarm, they are not as sensitive as smoke detectors (because you need a developed fire to activate it) and the risk to property value and human safety should be considered very carefully.
In addition to these notes smoke detectors should not be sited near air conditioning outlets, bathrooms and dead air areas and areas prone to insect infestation and chemical storage areas where abnormally high airflow rates and gas discharge may occur.
It is most manufactures recommendations that detectors are replaced at 10 years old, any detectors that have been contaminated with dust, dirt, smoke or water must be replaced.
East Sussex Fire Ltd Install, replace and perform regular testing of emergency lighting to comply with BS 5266, the Code of Practice for the emergency lighting of premises.
Emergency lighting is primarily intended to provide sufficient illumination to enable people to see their way safely out of a building in cases of emergency.
It is vital that emergency lighting comes on if the normal lighting fails, especially during a fire. The light needs to be sufficiently bright, illuminated for enough time, and be positioned so that the occupants of a building can be evacuated safely in an emergency.
Smoke Vents (AOV)
Automatic opening vents are often integrated into the fire alarm system.
As soon as the fire alarm smoke detector is activated the AOV will automatically
open fully to create a chimney effect, drawing the smoke away from your escape
route. This makes it possible for people to find the emergency exit more easily
should they need it.
East Sussex Fire will service you AOV and check it is functioning correctly
leaving it ready for use in an emergency.