A Guide To Reducing The Number Of False Alarms From Fire-detection And .
A guide to reducing the numberof false alarms from fire-detectionand fire-alarm systems
Using this bookletIf an automatic fire-detection and fire-alarm system is used and maintainedproperly, its fast response to a fire that is just beginning can greatly reducethe risk to life and limit damage to property. However, features thatprovide this fast response can also cause false alarms.We have produced this booklet as part of an initiative we are taking withthe Chief and Assistant Chief Fire Officers’ Association (CACFOA) andthe British Fire Protection Systems Association (BFPSA) to reduce falsealarms from automatic fire-detection systems.The aim of this booklet is to reduce both the nuisance caused by falsealarms and the unnecessary costs which may be a direct or indirect resultof these alarms.The definition of a false alarm is:‘a fire signal resulting from a cause other than fire’.About 90% of automatic fire-detection and fire-alarm systems do notregularly cause false alarms. However, the remaining 10% are involved inmost false alarms. Every false alarm causes disruption. This may affectyour customer service, your productivity or the general routine of yourorganisation. The cost of false alarms in the UK is estimated to be about 1 billion a year. If you assessed the cost to your company you wouldprobably be surprised. One medium-sized company found that the averagefalse alarm at one of their sites cost them 1,200, and at another sitecosts amounted to around 126,000 in one year alone. However falsealarms affect you, they could be a risk to the lives of others.2
The guidance given in this booklet is designed to help you to keep yourfire-detection and fire-alarm systems in good working order.If you have been given this booklet, you will probably be: responsible for a building’s fire protection;an employer;a tenant in a building which has several different occupiers; orsomeone else working in a building.Make sure a copy of this booklet is available to the person responsiblefor the fire-detection and fire-alarm system. We give information aboutthe ‘responsible person’ on page 6.Please play your part in reducing false alarms.The effect of false alarms on the fire andrescue serviceThe fire and rescue service’s main aim is to reduce the number offire-related deaths and injuries by preventing fires from starting or spreading.We need the fire and rescue service to help us with emergencies such asfires and accidents on the road. Responding to false alarms diverts thefire and rescue service from their fire-prevention duties, or from dealingwith real emergencies. They also disrupt work patterns and valuabletraining programmes.Almost half of the calls to the fire and rescue service are false alarms, andmost of these are false alarms from fire-detection and fire-alarm systems.3
According to the ‘Fire Statistics, United Kingdom’, in 2002 there were nearly280,000 false alarms from systems, and these types of call continue toincrease. This places an unacceptable burden on the fire and rescue service,and attending large numbers of false alarms can affect the motivation offire service staff.False alarms not only waste the fire and rescue service’s valuable resources,they also cause increased dangers on the roads. Accidents involving fireengines responding to false alarms can and do happen. These incidents,however rare, are unacceptable and need to be reduced.If your fire-detection and fire-alarm system is well designed and maintained,it should produce no more than one false alarm a year for every 50 detectorsfitted, and no more than one false alarm in any four-week period. For largefire-detection systems, we aim to reduce the level of false alarms wellbelow that of one a year for every 50 detectors.If your fire-detection system produces more false alarms than should beexpected, the fire and rescue service would consider it to be unsatisfactory.The person you employ to design and install a new fire-detection system,or to maintain an existing system, must be competent (that is, they musthave the necessary knowledge, training, experience and abilities to do thework). That person should be able to makesure that your fire-detection and fire-alarmsystem is designed, installed and maintainedto the highest possible standard.The level of competence of many contractorshas been independently certificated underan approved scheme. Your local fire andrescue service or the BFPSA can give youdetails of approved schemes.4
Your local fire and rescue service is always happy to give advice on anyfire-safety matter including overcoming problems with false alarms. Pages7 to 12 of this booklet also give advice on common causes of falsealarms and the action to take.Fire safety and the lawUnder fire-safety law, employers and othersresponsible for buildings must provide effectivefire precautions to protect employees as wellas people who may be visiting or using theirproperty. Your fire-detection and fire-alarmsystem forms part of those fire precautions.A system that causes false alarms may not beefficient as people will gradually lose confidencein the fire alarm and start to ignore its warning.So it is important that you recognise theimportance of keeping the fire-detection andfire-alarm system in good working order and removing the causes of falsealarms. The advice in this booklet will help you.It is also worth remembering that if a genuine fire alarm is ignored (forexample, because people mistake it for yet another false alarm), this canlead to death, injury and extensive damage. It is well known that manycompanies that suffer a serious fire will never effectively recover and willstop trading.5
The owners, occupiers, or other person with control over a building witha fire-detection and fire-alarm system should agree which of them will beresponsible for the system. That person should then nominate a suitableperson who agrees to be responsible for supervising the system. The personnominated should have received appropriate training or have the skills,knowledge or experience needed to make sure that: the system remains in good working order and is properly maintained; false alarms are investigated and action taken to solve any problem; maintenance or other work is carried out on the system only by acompetent person.faults are dealt with quickly and efficiently;those who have to take specific action when a fire alarm goes offhave appropriate training (see ‘Action to take’ on page 9);activities which may affect the system (for example, processes whichmay produce heat or smoke, redecorating or a change in manufacturingprocesses) are controlled; andIf the person nominated needs training, you can get advice from: the company that installed the fire-detection and fire-alarm system;the company that maintains the system; andyour local fire and rescue service.If these organisations cannot providetraining, you can get further helpfrom the BFPSA. Their details aregiven on page 14 of this booklet.6
Causes of false alarmsFalse alarms from fire-detection and fire-alarm systems can arise frommany different causes, most of which can be dealt with by careful planning.Typical causes of false alarms are: pollutants in the air setting off smoke detectors;extremely high temperatures setting off heat detectors;vandalism or malicious acts;mistakes in using the system;the equipment being faulty or not being maintained properly;fire detectors or red ‘break glass’ boxes being in the wrong place; andthe fire-detection system not being appropriate for the building orhow it is used.False alarms can come from three main devices – smoke detectors, heatdetectors and ‘break glass’ boxes.Smoke detectorsSmoke detectors respond to smoke and any similar pollutants in the air.If you have smoke detectors in your building, you must make sure thepeople in the building know about them.False alarms triggered by smoke detectors are often caused by: cooking;making toast;insects, particularly in the summer months;7
welding, soldering or similaractivities; candles and open fires;steam;dust;aerosols; anda lack of effectivemaintenance and cleaning.Heat detectorsThese are generally used in kitchens, boiler rooms and similar areas wheresmoke detectors may be too sensitive and cause false alarms. They areset to allow for expected temperature levels in the protected area, andwill trigger an alarm if the temperature goes above the expected level.False alarms may be caused by high temperatures in the protected area,or sudden increases in temperature.Break glass boxes‘Break glass’ boxes do not usually cause false alarms as a result of faultyequipment. However, the glass can be broken deliberately or by accident.If you think there is a high risk of this because of vandalism or where thebox is, they can be fitted with a transparent flap or cover that has to belifted before the glass can be broken.The actual cause of a false alarm may be easily identified and corrected.For example, if the cause is something someone has done (such as dustcoming from maintenance work), you can take action to prevent thisfrom happening again. However, you may need to take a more formalapproach to analysing the cause of the false alarm.8
Action to takeWhen the fire alarm sounds, everyone in the building should immediatelyfollow the fire action plan (this plan must be well publicised within yourbuilding). A trained member of staff may then find out if there is a fire(you should have arrangements in place so that you will know quicklywhether an alarm is genuine or false). If it is a false alarm, tell the fireand rescue service why it is a false alarm and be prepared to show themthe cause. This will help them to deal with the situation in the shortestpossible time.If you cannot find the cause of the false alarm, follow the proceduredescribed below.1Silence the fire alarm but do not reset the control panel as this willget rid of the information you need to investigate the cause of thefalse alarm.2Check the message on the control panel and find out where in thebuilding the false alarm came from.3As soon as possible after the false alarm, visit that area and locate thebreak glass box, heat detector or smoke detector that set off the alarm.4Try to find out why the break glass box or detector was triggered.The information on pages 10 and 11 may help you, but you may needto investigate further to find out the real cause (for example, vandalismor accidental damage to a break glass box or insects in a smoke detector).5If you are having difficulty finding the detector that was triggered, itmay be in a duct or above a false ceiling. If a plan showing where alldetectors are is available, use it to find the detector. Break glass boxesshould be easier to find as they should be in clearly visible positions.9
6If you cannot find the detector that was triggered, call in themaintenance company as they should know where detectors arewithin the fire-detection system.7If the control panel does not show where the relevant detector is, orif no detector was triggered, call in the maintenance company as theproblem may be due to faulty equipment.8Accurately record all the information about the false alarm in the systemlog book. This is very important as you may need the information ata later date.9If false alarms continue, and you cannot find the cause or action youtake is unsuccessful, analyse when the false alarms happen and wherethey come from. This will help you to see if there is any pattern thatmay help you to identify the cause (for example, cooking before mealtimes or a boiler switching on early in the morning).10 Your investigations should show you that the false alarms are theresult of faulty equipment, malicious acts, human error, or activitiesnear detectors.Equipment faultsIf you can’t identify the cause of the false alarm, or if there seems to be afault in the system, turn the alarm off but do not reset the control panel.(If you have to reset the control panel, make special arrangements withthe company that installed or maintains your system to collect as muchinformation as possible before the control panel is reset.) The informationon the panel will help you to find the problem. If your equipment seemsto be faulty, call in the company that installed or maintains your system sothey can take appropriate action.10
If your alarm system automatically alerts an alarm receiving centre (an ARC),contact the ARC straight away. Tell them you are having problems with yoursystem and agree how they should handle any further alarms (to avoidneedlessly calling out the fire and rescue service) until the problem hasbeen fixed.Effective, regular maintenance, including cleaning the inside and outside ofsmoke detectors, will help to prevent equipment faults from happening inthe first place.Malicious actsThis cause can be the most difficult to identify and often needs to beinvestigated carefully. Examples of malicious acts include: unnecessarily breaking the glass in break glass boxes; deliberately directing smoke (for example, from a cigarette) into asmoke detector.unauthorised people having and using test keys for break glassboxes; andHuman errorsExamples of human errors include the following. Building contractors carrying out hot or dusty work close to smokedetectors or heat detectors. The fire-alarm system not being switched off while its wiring is being altered.Note: If you are planning on making changes to your fire-detection andfire-alarm system, consult your local fire and rescue service to find outif the changes would affect any fire-safety arrangements in the building.Also consider how the changes could affect the other fire precautionsin your building.11
Unsecured control panels being activated, usually as a result of thepanel’s key or a similar device being left in the panel.These incidents can usually be tackled by changing working practices (forexample, issuing permits to work) or giving information and training tostaff and contractors responsible for buildings.Activities near detectorsMany false alarms result from activities carried out near fire detectors,particularly smoke detectors. A common example is burning toast in atoaster. More examples are given on pages 7 and 8. This type of alarmcan be tackled by carrying out the activity elsewhere, fitting a temporarycover on a detector while the activity is being carried out, changing thetype of detector or moving it, or changing the way the fire-alarm systemresponds when a detector is triggered. If you use temporary covers ondetectors, these should be fitted only by approved staff and removedcarefully as soon as possible after the activity has ended. You can getmore advice from the company that installed or maintains the system.You should consider all the activities thatgo on in your building and develop aplan to avoid false alarms. Make sureyou have proper arrangements in placefor training staff on work processes andpractices, the fire precautions you have,and how work processes and practicesmay affect the fire-alarm system if theyare not carried out properly.12
MaintenanceLike all electrical systems, your fire-detection and fire-alarm system willbe effective only if it is maintained and regularly checked by a competentperson. Poor maintenance will not only lead to false alarms, it may alsolead to a genuine fire alarm being ignored or missed. It can also reduce thelife of the system. All these problems lead to extra costs for you. Guidanceon maintaining your system, together with guidance on reducing false alarms,can be found in BS 5839 Part 1 – Code of Practice for design, installation,commissioning and maintenance of fire-detection and fire-alarm systems.You can get a summary of the guidance given in BS 5839 Part 1, and adviceabout schemes that can help you assess the competence of contractors,from the website at www.bfpsa.org.uk or by phoning 020 8549 5855.Where do I go for more help?If you have followed the guidance in thisbooklet and false alarms are still causing aproblem, your local fire and rescue servicecan give you advice. You should also ask thecompany that supplied, installed or maintainsyour system to investigate the matter and takeappropriate action. The relevant company’scontact details should be on or next to thefire-detection and fire-alarm system control panel or printed in thesystem log book. If you cannot find their contact details, BFPSA canrecommend suitable organisations.If your fire-detection and fire-alarm system has been provided as acondition of any fire-safety law, you may have to consult your local fireand rescue service before you make any changes to your system.13
Useful contactsLocal fire and rescue service:Fire-alarm maintenance company:BFPSA – British Fire Protection Systems AssociationPhone: 020 8549 5855Website: www.bfpsa.org.ukReducing false alarms will save you and the fire and rescueservice money, will reduce wasted efforts and may save lives.14
NotesUse the space below to make any notes you need.AcknowledgementsThis guide has been produced by a forum made up of the British FireProtection Systems Association, the Chief and Assistant Chief Fire Officers’Association and the Office of the Deputy Prime Minister. The forum wouldlike to thank all those involved.We have been able to use the photographs in this booklet with the kindpermission of: West Midlands Fire and Rescue Service;‘Fire’ Magazine; andBritish Approvals for Fire Equipment.15
Office of the Deputy Prime MinisterEland HouseBressenden PlaceLondon SW1E 5DUPhone: 020 7944 4400Website: www.odpm.gov.uk Crown copyright 2004This booklet (except the Royal Arms and logos) may be reproduced free ofcharge in any format as long as the reproduction is accurate and not used in amisleading way.The reproduction must be acknowledged as Crown copyrightwith the title and source of the publication shown.Published by the Office of the Deputy Prime Minister: Printed in the UK,February 2004 on material containing 75% recycled waste and 25% ECF pulp.Product code 04FPD01976
If your fire-detection and fire-alarm system is well designed and maintained, it should produce no more than one false alarm a year for every 50 detectors fitted, and no more than one false alarm in any four-week period. For large fire-detection systems, we aim to reduce the level of false alarms well below that of one a year for every 50 .
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Le genou de Lucy. Odile Jacob. 1999. Coppens Y. Pré-textes. L’homme préhistorique en morceaux. Eds Odile Jacob. 2011. Costentin J., Delaveau P. Café, thé, chocolat, les bons effets sur le cerveau et pour le corps. Editions Odile Jacob. 2010. 3 Crawford M., Marsh D. The driving force : food in human evolution and the future.
