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BS 5839 · Design, Install, Service

Fire Alarm
Systems

Commercial fire alarm installation across Mid Somerset. Conventional, addressable and wireless BS 5839-1 systems. Design, certification, and scheduled service — one contractor for the entire life of the system.

07889 334849
Commercial fire alarm control panel with manual call point and fire safety signage installed by DS Electrical Somerset
Fire Alarm Systems

Fire Alarms
Done Properly

Fire alarm systems save lives -- when they are designed, installed and serviced properly. We design and install BS 5839-1 compliant commercial fire alarm systems across Mid Somerset, from simple single-zone Grade F domestic systems through to multi-loop addressable panels for large commercial premises. Every system certified, every panel commissioned, every service visit logged.

01 BS 5839-1 Commercial Fire Alarms

The standard for fire detection and alarm systems in non-domestic premises. Covers everything from the initial fire risk assessment and system category (M, L1-L5, P1-P2) through to design, installation, commissioning, certification and ongoing service. We design to BS 5839-1:2017+A2:2023 and issue the correct G1 Design, G2 Install and G3 Commission certificates at each stage.

02 Conventional vs Addressable

Conventional systems split the premises into zones and a triggered device activates the whole zone. Ideal for smaller sites up to around 1,500m² -- shops, small offices, single-storey premises. Typically 2-8 zones, lower cost, simpler commissioning.

Addressable systems report the exact device that has activated. Essential for larger buildings, multi-storey premises, and anywhere fast fault finding matters. Panels from Advanced MxPro, Kentec Syncro, C-Tec, Morley-IAS and Apollo. Scalable from 1 to multiple loops with hundreds of devices per loop.

03 Wireless & Hybrid Systems

Hochiki EKHO, Apollo MultiPoint Pro and Hyfire Taurus wireless systems let us install addressable fire detection in listed buildings, period properties, and operating premises where cable runs are impossible or prohibitively disruptive. Full BS 5839-1 compliance, 10-year sealed battery life, and signal redundancy with mesh repeaters. We also deploy hybrid systems -- wireless expansion onto existing wired loops for phased upgrades.

04 Domestic Fire Alarm (BS 5839-6)

The domestic standard, covering everything from single-dwelling smoke alarms (Grade F) through to Grade A interconnected systems in HMOs and student housing. Interlinked mains-powered smoke and heat detectors with 10-year sealed battery backup from Aico, FireAngel and Kidde. HMO landlords: we issue the annual certificate required under HMO licensing and the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022.

05 Manual Call Points, Sounders, Beacons

Resettable manual call points (MCPs) with protective covers to prevent accidental activation. Conventional and addressable sounders and sounder/beacons to BS EN 54-3 and 54-23 respectively -- with output levels calculated to reach at least 65 dB(A) in every part of the premises (or 75 dB(A) at the bedhead in sleeping accommodation). Voice-sounder (VAD) systems available for high-occupancy premises and premises where standard tone sounders are inadequate.

06 Smoke, Heat & Multi-Sensor Detection

Optical smoke detectors for general fire detection, ionisation detectors for fast-flaming fires, heat detectors for kitchens and dirty environments, beam detectors for large open spaces, aspirating smoke detection (Wagner, Vesda) for server rooms and archives, and multi-sensor detectors that combine optical and heat for lower false-alarm rates. Every detector sited per BS 5839-1 Annex B.

07 Annual Service & Quarterly Inspection

BS 5839-1 Section 6 requires a competent person to carry out quarterly inspections (Section 45) and a full annual service (Section 44). We deliver both as a contracted service: every device tested, every sounder level verified, every call point operated, batteries tested under load, logbook updated, and a certificate issued for your fire risk assessment and insurance file. If anything fails we fix it the same day where practical.

08 False Alarm Reduction

Somerset Fire & Rescue now charge for repeated false alarm call-outs, and persistent false alarms can invalidate your insurance. We reduce false alarms by: reviewing detector siting (removing smoke detectors from steam-prone kitchens and replacing with rate-of-rise heat detectors), fitting multi-sensor detectors in marginal environments, adding delay-to-confirm on panels, and implementing staff verification procedures compliant with BS 5839-1 Section 37.

09 Fire Alarm Cable & Containment

Fire-rated FP200 Gold, Firetuff, or Prysmian FP PLUS cable for all fire alarm wiring -- BS EN 50200 PH30/PH60/PH120 survivability to match the category of system. Containment in galvanised steel conduit or tray where required, fire-rated intumescent seals at all compartment wall and floor penetrations, and proper segregation from other services per BS 5839-1 Section 26. We do not use standard twin-and-earth for fire alarm cabling. Ever.

10 Certification & Compliance

Every installation comes with the full set of certificates required by BS 5839-1:

  • G1 -- Design certificate: issued by the designer confirming the system meets the design objectives and category
  • G2 -- Installation certificate: issued by the installer confirming the system was installed to the design
  • G3 -- Commissioning certificate: issued after final testing confirming all devices operate correctly
  • G4 -- Acceptance certificate: signed by the user
  • G5 -- Verification certificate (where required by a third party)
  • Service and test certificates after every planned visit

All documentation logged and available to your insurer and local fire authority on request.

Commercial fire alarm system installed by DS Electrical with control panel, manual call point, sounder beacon and fire action signage

Wired, commissioned,
and certified.

Commercial fire alarm install: panel, manual call point, red beacon, and compliant signage. BS 5839-1 commissioning certificate issued on handover.

NAPIT approved electrical contractorNAPIT
CHAS accredited contractorCHAS
City and Guilds qualified electricianCity & Guilds
TrustMark government endorsedTrustMark
Part P registered electricianPart P
BS 7671 18th Edition compliantBS 7671
£2M
Public Liability Insurance
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Get Started

Fire Alarm Quote
or Service Visit?

Free survey, fixed-price quote, annual service contracts. Call Dan directly.

Direct Dan Stevens, Director: 07889 334849 Dan Street, Director: 07983 106928
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Request a Fire Alarm
Survey or Service

Tell us about your premises. We will come back within 24 hours to arrange a free site survey or add you to the service schedule.

From enquiry to
certified install.

Every project follows the same five-step process. No surprises, no scope creep.

01

Fire risk assessment review

We review your existing FRA (or commission one with our partner assessor) and map it to the BS 5839-1 category needed: M, L1-L5 or P1-P2.

02

Design + G1 certificate

System designed on paper: panel type, device count, cable routes, sounder coverage, power supply sizing. G1 Design certificate issued.

03

Install + G2 certificate

FP200 Gold or equivalent cable, proper segregation, devices sited per BS 5839-1 Annex B. G2 Installation certificate issued on completion.

04

Commission + G3 certificate

Every device activated and tested. Sounder output levels measured. Panel programmed. G3 Commissioning certificate signed off.

05

Service contract

Quarterly inspections and annual service scheduled immediately. Logbook supplied. Certificates lodged for your fire risk assessment file.

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Call Dan — 07889 334849