WhatBS5266RequiresforEmergencyLighting
Emergency lighting is one of the most frequently neglected compliance obligations in commercial property — not because landlords and facilities managers are unaware of it, but because the testing and documentation requirements are poorly understood and inconsistently applied. BS 5266-1 (Emergency Lighting of Premises: Code of Practice) is the governing standard, and the October 2025 update — BS 5266-1:2025 — introduced changes that go beyond the existing testing regime. New circuit wiring requirements for high-risk areas now mandate that luminaires be supplied from at least two separate circuits, limiting the number of luminaires affected by any single circuit fault. A mandatory five-yearly photometric verification test was also introduced, requiring physical measurement of illuminance levels in escape routes against the original design — a test that goes well beyond the functional switching check that most testing programmes consist of.
The legal basis for emergency lighting maintenance is the Regulatory Reform (Fire Safety) Order 2005: the Responsible Person — the employer, owner, or managing agent — must ensure that emergency lighting is adequate for the premises, properly maintained, and that records of maintenance are kept. This obligation is not discharged by installing a system; it requires an ongoing programme of testing, recording, and remediation that continues for the life of the building occupancy.
A commercial building without a maintained, tested, and documented emergency lighting system is exposed on three distinct regulatory fronts: the Regulatory Reform (Fire Safety) Order 2005, under which the Responsible Person is legally required to ensure emergency lighting is adequate and maintained; insurance liability, where the absence of testing records can void cover in the event of an incident; and building control sign-off on change-of-use or refurbishment works, where the emergency lighting system must be demonstrated as compliant before practical completion is certified.
Mandatory Testing Schedule
BS 5266 requires monthly functional tests, annual full-duration tests, and — under the 2025 update — five-yearly photometric verification measuring actual illuminance in escape routes. All results must be recorded in a maintained logbook.
Two-Circuit Wiring Requirement
BS 5266-1:2025 mandates that luminaires in high-risk areas be supplied from at least two separate circuits, with no more than 20 luminaires per circuit, to prevent total loss of emergency lighting from a single fault.
Legal Accountability Under RRFSO
The Responsible Person — employer, owner, or managing agent — is legally required under the Regulatory Reform (Fire Safety) Order 2005 to ensure emergency lighting is adequate, maintained, and documented throughout the building's occupancy.
Logbook as Regulatory Evidence
The emergency lighting logbook is requested by insurers, fire risk assessors, and building control inspectors — its absence is treated as evidence of non-compliance regardless of the physical condition of the installed system.
What Changed in BS 5266-1:2025
The October 2025 update to BS 5266-1 introduced two changes that are relevant to both new installations and existing systems undergoing significant refurbishment. First, in high-risk areas — defined by the standard as areas where the consequences of lighting failure present a significant risk to occupants — luminaires must be wired from at least two separate circuits, with no more than 20 luminaires affected by the failure of any single circuit. This is a wiring topology change: it requires the emergency lighting design to route circuits through high-risk areas in a way that ensures residual illumination is maintained if any one circuit fails. Second, the five-yearly photometric verification test requires a qualified engineer to measure actual illuminance levels at floor level in escape routes using a calibrated lux meter, comparing the results against the illuminance values in the original emergency lighting design. This test can only be carried out when the ambient lighting in the building is at its minimum — typically requiring the test to be conducted in darkness — and it requires access to the original photometric design documentation.
Testing Schedule and Circuit Requirements
Testing Schedule — BS 5266:2025
- Monthly functional test
- Simulate power failure, verify all luminaires illuminate correctly, record result per luminaire in the logbook — duration: typically 25% of rated battery duration
- Annual full-duration test
- Luminaires must remain illuminated for the full rated duration — typically 3 hours for maintained systems; pass/fail recorded per luminaire
- Five-yearly photometric verification (BS 5266-1:2025)
- Physical measurement of illuminance levels in escape routes against original design — requires calibrated lux meter, minimum ambient lighting conditions, and access to photometric design documentation
- Logbook requirements
- Must record: test dates, results, failures, remedial actions, luminaire locations and identifiers — requested by insurers, fire risk assessors, and building control
Circuit Wiring Requirements (BS 5266-1:2025)
- High-risk area wiring
- Luminaires in high-risk areas must be supplied from at least two separate circuits
- Maximum luminaires per circuit
- No more than 20 luminaires in high-risk areas on any single circuit — limits the scope of any single circuit fault
- Design intent
- Ensures that partial emergency lighting remains available following any single circuit fault — eliminates total blackout scenarios in high-risk areas
- Application scope
- Applies to new installations and refurbishments where the emergency lighting design is reviewed — not retrospective to unchanged existing systems
What a Compliant Programme Covers
- 01Emergency lighting system design — luminaire placement and circuit topology to BS 5266-1:2025, including two-circuit requirement for high-risk areas
- 02Monthly functional testing programme — documented, recorded, and actioned against individual luminaire performance
- 03Annual full-duration testing — luminaire-by-luminaire pass/fail record against rated duration
- 04Five-yearly photometric verification — illuminance measurement in escape routes against original design documentation
- 05Circuit wiring review — high-risk areas assessed and rewired where required to meet two-circuit requirement
- 06Logbook establishment and maintenance — structured records meeting insurer, fire risk assessor, and building control requirements
- 07Defect rectification and replacement luminaire specification to current standards
Common Compliance Failures and How to Resolve Them
No Testing Records
Challenge
Buildings without emergency lighting logbooks cannot demonstrate compliance with either BS 5266 or the RRFSO — the absence of records is treated by insurers, fire risk assessors, and building control as equivalent to no testing programme having been in place, regardless of whether testing actually occurred.
Solution
Establish a testing regime and logbook immediately; record from the current date with complete and honest results. Commission a full-duration test as the first documented event to establish a performance baseline for every luminaire, then build the monthly and annual schedule around it.
Self-Maintained vs Non-Maintained Luminaire Misspecification
Challenge
Self-maintained luminaires (always illuminated) and non-maintained luminaires (only illuminate on power failure) serve different functions in an emergency lighting design — misspecification leads to inadequate coverage in areas where the maintained function is required, such as cinemas, theatres, or entertainment venues where ambient lighting is routinely dimmed or extinguished.
Solution
Luminaire type selection must follow the fire risk assessment and premises type — the standard provides guidance on maintained, non-maintained, and combined luminaires by application. In any premises where normal lighting is regularly switched off or dimmed below emergency illuminance levels, maintained or combined luminaires are required.
Five-Year Photometric Test Not Yet Programmed Under New 2025 Requirements
Challenge
Facilities managers whose testing programmes were established before October 2025 will not have the five-yearly photometric verification scheduled — the new requirement is not retrospectively communicated to existing compliance programmes, meaning many buildings are already behind on this obligation.
Solution
Commission a photometric survey from a competent engineer as a baseline — the survey confirms whether actual illuminance levels in escape routes match the original design intent and identifies any areas where luminaire deterioration or repositioning has reduced coverage below the required minimum.
Key Takeaways
- 01BS 5266-1:2025 came into effect in October 2025 and introduced two new requirements: mandatory two-circuit wiring for luminaires in high-risk areas, and a five-yearly photometric verification test measuring actual illuminance in escape routes.
- 02The testing schedule is a legal obligation under the RRFSO: monthly functional tests, annual full-duration tests, and now five-yearly photometric verification — all must be recorded in a logbook that can be produced on request.
- 03Luminaires in high-risk areas must be supplied from at least two separate circuits, with no more than 20 luminaires on any single circuit — this is a wiring design requirement, not simply a testing standard.
- 04The emergency lighting logbook is a regulatory asset: insurers, fire risk assessors, and building control inspectors request it as evidence of compliance — its absence is treated as non-compliance regardless of the physical installation condition.
- 05The five-yearly photometric verification test is new under BS 5266-1:2025 and requires physical measurement of illuminance levels in escape routes with a calibrated lux meter — it cannot be satisfied by a functional switching test alone.
- 06The legal Responsible Person under the RRFSO — employer, owner, or managing agent — is personally accountable for ensuring emergency lighting is adequate, maintained, and documented; the obligation does not transfer to the electrical contractor.
Building a Defensible Compliance Record
Emergency lighting compliance is not a one-time installation task — it is a continuous programme of testing, recording, and remediation that runs for the life of the building occupancy. The 2025 update to BS 5266-1 has added photometric verification and circuit topology requirements that go beyond what most existing programmes cover. A facilities manager who acts on this now — establishing a compliant testing schedule, building a defensible logbook, and commissioning a photometric baseline — is significantly better positioned than one who addresses it when an insurer or fire risk assessor raises it as a finding.
