Fire Alarms

From the simplest two zone conventional control panel to the most complex interactive digitally addressable fire detection systems. We install into a variety of commercial environments.


JLM Electrical can provide an interactive, fully addressable fire detection system which is designed to reduce false alarms, whilst providing the most reliable fire detection systems to suit your needs and protect your property and life.


We can even maintain closed protocol fire alarms although it is limited as to what repairs we can conduct.


Fire alarm maintenance requires site visits either quarterly or every six months depending on the system and your property. In addition weekly tests must also be conducted by you and we will show you how. All fire alarm testing including the weekly tests must be recorded in the fire log book.


No obligation quote


JLM Electrical offer a no obligation quotation service involving a site survey of your fire extinguishers and a quotation service. We endeavour to be on site within 24-48 hours after the initial request or at a convenient time for you. Written quotations are then normally submitted within 3-5 days from the site survey.


Once our quote is accepted we also supply an equipment type and location list to be held in the fire log book so you know what you have and where it is as well as when the next discharge test is due.


Fire risk assessment


All businesses with 5 or more employees require a written fire risk assessment. JLM Electrical has partner companies that offer these services. We do not receive commission for these referrals but simply believe in recommending the best companies for the job.


We are firm believers that risk assessments must be carried out by independent, reliable and qualified assessors. The companies we recommend meet this criteria.


Once we have agreed on the correct plan for you we will install the fire alarm and/or the fire extinguishers you require and remove any old ones, leaving you with the service certificate.


Standards and Warranties


All fire extinguishers and fire alarm equipment supplied by JLM Electrical carry manufacturers’ warranties. These range from one year to five years depending on equipment and manufacturer. Monarch Fire (UK) Ltd is fully insured as per the legal requirements for our industry.


Our service plans meet the requirements of the relevant British Standards. Our database will flag up when your fire extinguisher or fire alarm service is due and with your agreement we will automatically complete a site service visit or if requested we will phone and book an appointment with you to carry out the work.




The categories of fire alarm systems are L if they are designed to protect life, P to protect buildings and M if they are manual systems.


M Fire Alarm System


Manual systems – hand bells, gongs etc. These may be purely manual or manual electric which may have call points and sounders. The occupants will have to discover the fire and act to warn others by operating the manual call point . Such systems form the basic requirement for places of employment with no sleeping risk. These systems are generally not used anymore


P1 Fire Alarm System


The system is installed throughout the building – the objective being to call the fire brigade as early as possible to ensure that any damage caused by fire is minimised. Small low risk areas can be excepted, such as toilets and cupboards less than 1m².


P2 Fire Alarm System


Detection should be provided in parts of the building where the risk of ignition in high and/or the contents are particularly valuable. Category 2 systems provide fire detection in specified parts of the building where there is either high risk or where business disruption must be minimised.


L1 Fire Alarm System


A category L1 system is designed for the protection of life and which has automatic detectors installed throughout all areas of the building (including roof spaces and voids)with the aim of providing the earliest possible warning. A Category L1 system is likely to be appropriate for the majority of residential care premises. In practice detectors should be placed in nearly all spaces and voids. With category 1 systems, the whole of a building is covered apart from minor exceptions.


L2 Fire Alarm System


A category L2 system designed for the protection of life and which has automatic detectors installed in escape routes, rooms adjoining escape routes and high hazard rooms. In a medium sized premises (sleeping no more than ten residents) a category L2 system is ideal. These fire alarm systems are identical to an L3 system but with additional detection in an area where there is a high chance of ignition e.g. kitchen) or where the risk to people is particularly increased (e.g. sleeping risk).


L3 Fire Alarm System


This category is designed to give early warning to everyone. Detectors should be placed in all escape routes and all rooms that open onto escape routes. Category 3 systems provide more extensive cover than category 4. The objective is to warn the occupants of the building early enough to ensure that all are able to exit the building before escape routes become impassable.


L4 Fire Alarm System


Category 4 systems cover escape routes and circulation areas only. Therefore, detectors will be placed in escape routes, although this may not be suitable depending on the risk assessment or if the size and complexity of a building is increased. Detectors might be sited in other areas of the building, but the objective is to protect the escape route.


L5 Fire Alarm System


This is the ‘all other situations’ category e.g. computer rooms which may be protected with an extinguishing system triggered by automatic detection. Category 5 systems are the ‘custom’ category and relate to some special requirement that cannot be covered by any other category.


The Grade System


Relates to system engineering, not level of protection.


BS 5839: Pt.6 grades fire detection systems from Grade F up to Grade A. Generally speaking, the greater the fire risk and the more demanding the application, the more comprehensive the system needs to be.


  • Grade F – System of one or more battery powered smoke alarms (and heat alarms if required)
  • Grade E – System of interlinked mains powered smoke alarms (and heat alarms if required) with NO stand-by supply. The interlink can be hardwired or radio-interlinked. Please note that Safelincs Ltd will not distribute Grade E alarms, as we only recommend alarms with backup batteries.
  • Grade D – System incorporating one or more interlinked mains powered smoke alarms (and heat alarms if required), each with an integral stand-by supply. The interlink can be hardwired or radio-interlinked.
  • Grade C – System consisting of smoke detectors and sounders (which may be smoke alarms) connected to a common power supply, comprising normal mains and stand-by supply, with central control equipment
  • Grade B – Fire detection and alarm system comprising fire detectors (other than smoke alarms), fire alarm sounders and control and indicating equipment to either BS EN 54-2 (and power supply to BS EN 54-4), or to Annex C of BS 5839: Pt.6
  • Grade A – Fire detection system incorporating control and indicating equipment to BS EN 54-2, and power supply to BS EN 54-4, installed to BS 5839: Pt.1 with some minor exceptions

The changes from the previous edition are relatively small: Grade A & B now refer to the latest European Standards and there are minor changes in requirements. Grade C now requires central control of the system. Grades E, D & F now have reference to heat alarms in addition to smoke alarms.


Concerned by problems with battery powered units in Grade F, the prescriptive advice in the Code now recommends a minimum five year battery life and batteries that are secured so that a special tool is required to remove them for use in tenanted single storey properties.


As the overwhelming number of residential applications in the UK will fall into the D to F categories, this is the area on which this guide will naturally focus. If you are particularly interested in unusual grades of protection, you are invited to look further at the relevant clauses of the Code.


Of course, installers and specifiers may install a system with greater safety features than laid down in the letter of the Code. For example, rather than a Grade E system landlords might think it prudent to install a Grade D system instead. This is especially true considering the many restrictions that apply to the use of Grade E systems.


To find out more, please call us on 0113 4180143 or click here to email us.



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