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fire alarm categories
December 3, 2019

It is a legal requirement that the fire alarm system at your business premises or site is fit for purpose and in working order. The legal requirement is under The Regulatory Reform (Fire Safety) Order 2005 and ensures almost all buildings, places and structures, other than individual private homes, have a fire alarm system in place. If you own the business site, then it is your responsibility to ensure that your premises reach the required standards of fire safety. As part of this responsibility, you must ensure your system falls into the correct fire alarm category. By adhering to the Fire Safety Order, you can help keep everyone in your building safer.

There are eight individual fire categories, as defined in the BS 5839 code. This is the British standard for fire alarm installation, set out in a governmental code of practice.

Each category falls under three different types of systems – manual, life protection and property protection. The category of fire alarm system your business requires will depend on various factors, such as:

  • Your type of premises
  • The contents within your business
  • The nature of your business
  • The level of risk

The best way to find out which fire alarm system is required by your business is to book in for a professional Fire Risk Assessment, carried out by fire safety experts. They will be able to grade your fire alarm system and establish which alarm needs to be fitted.

Fire alarm system categories

There are eight fire alarm categories that your system can fall within. They vary depending on the nature of your business and the other factors stated above. The fire alarm categories include:

fire alarm categories - manual system

Want to know more information on the different fire alarm categories? Keep reading for a detailed explanation of each category.

Manual fire alarm systems

These are the least sophisticated of systems, which rely on the building’s occupants to detect a fire and provide a warning to others. When a fire is discovered, employees must activate the alarm manually, in order to alert everybody else in the building to the danger.

A typical example of a manual fire alarm system is a series of break glass units, which are installed at each point of exit in a building. This allows those escaping a fire to raise the alarm as they leave the danger zone.

Manual fire alarm systems can be effective but due to reliance on individuals, it means that there can be an increased risk of employee and visitor safety, especially if the site is not highly populated with few people to raise an alarm. 

Automatic fire alarm systems for the protection of life

Fire alarm systems that fall into the L category are those deemed most suitable for protecting life within a building. Systems designed for this purpose are divided into five sub-categories, depending on their level of effectiveness.

L1 is a type of fire alarm category

Category L1 – Maximum life protection

This is the most comprehensive fire alarm system, which features detectors in all areas of a building where a fire could feasibly start. Detectors are linked up to a centralised alarm system which alerts the whole building should a fire break out.

The objective of this setup is to ensure that inhabitants are given the earliest possible warning, should an emergency occur. It is therefore the ideal standard for premises such as large hotels and care homes, where early detection of a fire is crucial to the chances of escape.

Category L2 – Additional life protection

L2 is one of 8 fire alarm system categoriesFire alarm systems that fall into this category feature smoke detectors in all rooms that form part of an escape route, including corridors. Detectors also need to be installed in all high-risk rooms, such as kitchens, boiler rooms and areas with heavy plant machinery.

L2 systems are effective at providing an early warning to occupants beyond the source of the fire and those working in high risk areas. Examples of properties that typically employ this system include factories or medium sized residential premises.

Category L3 – Standard life protection

L3 is a fire alarm categoryStandard life protection systems feature detectors in all escape routes and rooms that open onto an escape route. The objective of this system is to ensure that all inhabitants of the building are given enough warning to escape a fire, before their exit is impeded by the presence of flames, smoke or toxic fumes.

This category of fire alarm system is typically adopted in regular sized office blocks and commercial buildings that have flights of stairs.

Category L4 – Modest life protectionFire alarm system types - L4 system

An L4 category fire alarm system consists of detectors within escape route areas only, such as in corridors and stairways. Any circulation areas that make up part of the escape passage should also be fitted with a detector when the site is classed within this fire alarm category.

Commercial properties that generally adopt this category of system are those that have a lower level of risk. For example, an office that consists of ground floor rooms only would require less warning time to evacuate all personnel.

Category L5 – Localised life protectionFire alarm categories - L5 system

L5 fire alarm category systems are those that are installed to tackle a specific fire risk in a certain area of a building. For example, if there is a room in a building that poses an exceptional hazard because of the items stored there or business activities carried out there.

An L4 category system may be appropriate for the building in general but an L5 system is also required, in order to recognise the level of risk this particular room presents.

Automatic fire alarm systems for the protection of property

P category fire alarm systems are those that are designed to protect property. It is appropriate to label a system under this category, when considering how a business and its operations will be protected from the risk of fire.

Category P1Property protection fire alarm category - P1

A P1 fire alarm system involves installing detectors in all areas of the building. The objective of a system like this is to protect buildings that are critical to the operations of a business.

By implementing maximum protection across a whole site, those in charge of fire safety can ensure that any fire that breaks out is detected and neutralised as quickly as possible. This lowers the risk of damage and disruption and in turn, the financial impact that a fire could inflict on a company.                            

Category P2Property protection fire alarm categories - P2

In a category P2 fire alarm system, fire detectors are installed in high risk areas only. Whilst a system like this does not provide the same level of cover as a P1 solution, it does provide early detection for the most likely sources of a fire.

This early detection will decrease the time it takes for the fire services to arrive on the scene and will help to minimise any damage to the property and losses to the business.

About BS 5839 and the Regulatory Reform (Fire Safety) Order 2005

The British Standard of fire alarms (BS 5839) is part of the overarching RRO Fire Safety Order, which is legislation created to provide a fire safety standard for commercial properties. You can find out more about the Regulatory Reform (Fire Safety) Order 2005 with our handy guide.

Types of fire alarms

There are a wide range of alarms and detectors available for your business, which you can browse on our fire alarm page. In order to establish the category of system required and devices most suitable to your premises, our expert fire safety team recommend a full fire risk assessment is carried out on your site.

Find out more

To learn more about getting a fire alarm installed for your business, you can download our Essential Guide to Fire Alarm Systems or find out more about our services here. BusinessWatch are a BAFE accredited fire safety company. We are trusted by hundreds of companies around the UK to install, maintain and monitor fire alarm systems. Get in touch for a free quote today.

fire alarm system escape route

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