If you manage a building in the UK—whether it’s an office, school, shop, block of flats, or industrial site—BS 5266 is one of the key life-safety standards you need to understand. It sets the rules for emergency lighting, ensuring that occupants can escape safely during a power failure, fire, or other emergency.
This blog post breaks down the requirements into simple, practical language you can use straight away.
What Is BS 5266?
BS 5266 is the British Standard that provides guidance on the design, installation, commissioning, and maintenance of emergency lighting systems.
Its primary goal is to help buildings provide:
- Safe, illuminated escape routes
- Clearly visible exit signs
- Backup lighting for critical safety tasks
- Lighting that supports emergency services
BS 5266 is not a law itself, but compliance helps meet legal obligations under the Regulatory Reform (Fire Safety) Order 2005, Building Regulations, and HSE expectations.
Key Requirements of BS 5266
1. Emergency Lighting Must Operate for a Minimum Duration
Most buildings must provide 3 hours of emergency lighting duration after a power loss.
This ensures:
- Occupants can evacuate safely
- Firefighters have adequate visibility
- The building does not need to be evacuated again if power briefly returns
Some small or low-risk premises may be permitted to use 1-hour systems, but 3 hours is now widely regarded as the best practice.
2. Escape Routes Must Be Adequately Lit
Escape route lighting must:
- Illuminate corridors, stairs, ramps, and final exits
- Provide a minimum of 1 lux along the centre line of the escape path
- Avoid shadows, glare, or dark corners
Any change in level, direction, or hazard point must also be well illuminated.
3. Emergency Exit Signs Must Be Visible and Correctly Placed
BS 5266 specifies requirements for:
- Sign visibility distance (based on sign size)
- Uniformity of lighting so signs stand out
- Directional arrows so occupants know where to go
- Consistent sign style (ISO 7010-compliant “running man” format recommended)
If an exit is not visible from somewhere along a route, you must install additional signs.
4. High-Risk Task Areas Require Special Lighting
Where people work with machinery, chemicals, heat, or other hazards, emergency lighting must provide enough illumination for them to:
- Shut down equipment safely
- Prevent further danger
- Exit without injury
This lighting level is typically 10% of normal lighting or a minimum recommended level tailored to the task.
5. Open Areas (“Anti-Panic Zones”) Need General Emergency Lighting
Large open spaces—such as halls, atriums, canteens, or open-plan offices—require emergency lighting too.
Purpose: prevent panic and help people orient toward escape routes.
Minimum requirement:
- 0.5 lux across the floor area (excluding a small border zone)
6. Luminaires Must Be Fit for Purpose
BS 5266 outlines the types of emergency lighting units:
- Maintained: Always on, even in normal power
- Non-maintained: Only illuminate during power failure
- Combined units: Contain both maintained and non-maintained lamps
Choice depends on building use. Example:
- Cinemas or theatres typically require maintained signs
- Offices may use non-maintained luminaires in escape routes
7. System Testing and Maintenance Is Mandatory
The standard requires a structured testing regime:
- Daily: Check indicators on central battery systems
- Monthly: Short functional test of all emergency lights
- Annually: Full 3-hour duration test
All results must be:
- Recorded in an emergency lighting logbook
- Acted upon immediately if failures occur
Planned preventative maintenance is strongly recommended.
8. System Documentation Must Be Kept
BS 5266 mandates that the following must be available on-site:
- Design records
- Commissioning certificates
- Logbooks
- Maintenance schedules
- Test records
These documents support building safety audits and legal compliance.
Why BS 5266 Compliance Matters
Complying with the standard ensures:
✔ Safer evacuation during emergencies
✔ Reduced liability for building owners
✔ Compliance with fire safety law
✔ Confidence during fire inspections
✔ Clear guidance for installers and maintenance teams
Need more information? check out our E-SEL3 Selectable Emergency Range or Talk to our lighting design team.