Fire Detection

 Fire Detection

Fire detection systems fall into the category of Essential/Compulsory requirement for your business. It is therefore critical the most effective and relevant system is both designed and installed in accordance with your requirements and relevant regulations alike.

Custodian offer a complete Design, Install and support service for all you fire detection requirements. Our experienced consultants will assess your requirements and Design a system that fulfils not only your needs but also the Strict rules set out in accordance with BSEN54-2 , BSEN54-4 and BS5839.

Specification and Design

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 sell 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 fire detectors and alarm 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 very minor exceptions

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, 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 consider 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.

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Grade F

Levels of Protection – Categories of System

This relates to the level of protection afforded by the system.

Within the A – F grades defined earlier, the standard identifies three different categories of protection:

  • LD1 – A system installed throughout the dwelling, incorporating detectors in all circulation spaces that form part of the escape routes from the dwelling, and in all rooms and areas in which fire might start, other than toilets, bathrooms and shower rooms
  • LD2 – A system incorporating detectors in all circulation spaces that form part of the escape routes from the premises, and in all rooms or areas that present a high risk of fire to occupants
  • LD3 – A system incorporating detectors in all circulation spaces that form part of the escape routes from the premises

It is noted that an LD3 type system is intended to protect escape routes for those not directly involved in the fire and may not save the life of anyone in the immediate vicinity of the fire.

Only by quoting Grade and Category can a meaningful and effective alarm system be specified, e.g. Grade D, Category LD2.

With a range of technology available for use, although the actual design of device location is strict to the requirements of BS5839, we will endeavour to use the most appropriate equipment to achieve the required standards. By doing this we can be sensitive to your building architecture. At our disposal are fully wired conventional systems to wireless solutions within buildings where Fireproof red cable would simply not be appropriate.

Combined with our comprehensive support your fire safety is solved.