Emergency Lighting — What Trade Businesses Need to Know About BS 5266 (2026)

What Emergency Lighting Is and Why It's a Legal Requirement

Emergency lighting is lighting that operates automatically when the normal mains supply fails. Its core purpose is life safety: it illuminates escape routes, exits and open areas so that occupants can evacuate without injury, and it lets people identify and use firefighting equipment and call points on the way out.

Two things govern it in England and Wales. The first is BS 5266-1, the code of practice for the emergency lighting of premises — this is the technical standard that tells you how systems should be designed, installed, tested and maintained. The second is the Regulatory Reform (Fire Safety) Order 2005, which is the law. The Fire Safety Order places a duty on the "Responsible Person" — usually the employer, building owner or occupier — to ensure that escape routes and exits are kept adequately illuminated, which in practice means providing and maintaining emergency lighting where a risk assessment identifies the need.

That split matters when you talk to clients. The standard (BS 5266) tells you what good looks like; the Fire Safety Order means a failure can become a criminal matter, with enforcement by the local fire and rescue authority. For the electrician, complying with BS 5266 is how you help the Responsible Person discharge their legal duty.

Maintained vs Non-Maintained Luminaires

The first distinction every electrician needs to be fluent in is how the luminaire behaves day to day.

• Non-maintained: the emergency lamp is off during normal operation and only illuminates when the mains supply to it fails. These are common in workplaces that are only occupied when the normal lighting is on — offices, workshops, retail back-of-house.
• Maintained: the emergency lamp is lit all the time, on both mains and battery. These are used where the normal lighting may be dimmed or switched off while people are present — cinemas, theatres, function rooms, places of assembly.

A common point of confusion: an illuminated exit sign in an office is typically a maintained luminaire (the legend stays lit), while the escape-route downlights along the corridor may be non-maintained. Get the type right at design stage — it affects energy use, lamp life and the client's expectations.

Self-Contained vs Central-Battery Systems

The second distinction is where the power comes from when the mains drops out.

Self-Contained Luminaires

Each fitting has its own battery, charger and control gear built in. They're cheaper to install, need no fire-rated wiring back to a central source, and a single failure only affects one fitting. The trade-off is that every battery is a maintenance item — on a large site you may have hundreds of individual batteries to test and eventually replace. Self-contained is by far the most common choice for small and medium commercial premises.

Central-Battery Systems

A single central battery (or generator) supplies all the emergency luminaires through fire-resistant cabling. Batteries are easier to monitor and maintain in one place, and individual fittings can be simpler. But the install is more expensive, the supply cabling must be fire-rated, and a central fault has a wider impact. Central-battery systems suit large or complex buildings — hospitals, large offices, shopping centres.

The Three Categories of Emergency Escape Lighting

BS 5266 splits emergency escape lighting into three functional types. A competent design will usually include more than one.

• Escape route lighting: illuminates the defined routes people use to leave the building — corridors, exit doors and the final exit to a place of safety.
• Open area (anti-panic) lighting: provided in larger undefined spaces (generally floor areas above 60m²) so that occupants can reach a point where an escape route is identifiable, reducing the risk of panic.
• High-risk task area lighting: provided where a sudden loss of light would create a danger — for example, near machinery that must be shut down safely, or above a deep tank or process. The required illuminance here is higher and tied to the task.

Minimum Illuminance Levels

BS 5266 (aligned with BS EN 1838) sets minimum light levels measured at floor level. These are the numbers you design to and the numbers an inspector can check with a lux meter.

• Escape routes: a minimum of 1 lux along the centre line of the defined escape route.
• Open area (anti-panic): a minimum of 0.5 lux across the core of the empty floor area (excluding a border around the perimeter).
• High-risk task areas: a minimum of 10% of the required maintained illuminance for the task, and not less than 15 lux.

These are minimums, not targets — design with margin. Uniformity also matters: BS 5266 limits the ratio of maximum to minimum illuminance so you don't get bright pools next to dark patches that the eye struggles to adapt to. Spacing tables from luminaire manufacturers are the practical tool for hitting these figures at the right mounting heights.

Duration — Why It's Usually 3 Hours

Emergency luminaires must maintain the required illuminance for a rated duration after the mains fails. For most premises the standard rated duration is 3 hours. This covers the time needed to evacuate, allow the fire service to work, and — importantly — let people safely re-enter or remain if the premises are of a type where evacuation may not be immediate, such as sleeping accommodation.

A 1-hour duration is permitted only in limited circumstances — typically where the premises are evacuated immediately on supply failure and not re-occupied until the system has recharged. In practice, specify 3-hour systems unless a fire risk assessment positively justifies otherwise. It avoids arguments at handover and is what most clients and inspectors expect.

Siting — Where Luminaires Must Go

BS 5266 doesn't just set light levels; it tells you where luminaires must be located. Emergency lighting should be sited at or near each of the following points — "near" generally meaning within 2 metres measured horizontally:

• At every final exit and exit door intended for escape
• At each change of direction in a corridor or escape route
• At every change of floor level and on staircases, so each flight is directly lit
• At each fire alarm call point
• At firefighting equipment (extinguishers, hose reels) and safety signs
• At intersections of corridors and outside each final exit, to the place of safety
• Near first-aid points and any change in the floor that could cause a trip

Mounting emergency luminaires at least 2 metres above floor level is normal practice, and exit signs must be positioned so the legend is legible from the distances set out in the standard. Where a corridor turns, a luminaire at the turn lets people see the next leg of the route — this is one of the most common siting omissions on cheap installs.

Testing and Maintenance — The Recurring Work

This is where the ongoing revenue sits, and where most premises fail their compliance. BS 5266 requires a defined regime of routine testing, all of which must be recorded.

Monthly Short Functional Test (the "Flick Test")

Once a month, each luminaire is operated from its battery for a short period — long enough to confirm the lamp illuminates and the changeover works, but not so long as to drain the battery. This is done by simulating a mains failure (a test key switch, a designated test breaker, or an addressable system command). Every luminaire and exit sign must be checked to be functioning, and the result logged.

Annual Full-Rated-Duration Discharge Test

Once a year, the system is tested for its full rated duration — usually the full 3 hours. The luminaires run on battery for the whole period and are then checked to confirm they were still providing adequate light at the end. Any battery that fails to hold the full duration is replaced. After the test, the system must be restored to mains and the batteries left to recharge fully. Self-test and addressable systems can automate much of this and produce a report, but the records still need to be kept and acted on.

The Fire Safety Logbook

Every test, inspection and remedial action must be recorded in a fire safety logbook (paper or electronic). This is the evidence the Responsible Person relies on if challenged by a fire safety inspector. No logbook, or gaps in it, is treated as a failure to maintain the system — even if the hardware happens to be working on the day.

Certification

Two main certification points apply, and you should be clear with the client which you're providing.

• Commissioning (completion) certificate to BS 5266: issued when a new or modified system is installed, commissioned and verified against the design. It confirms the system has been installed correctly, tested and meets the standard.
• Periodic inspection and test certificate: issued following routine inspection and testing of an existing system — typically the annual full-duration test — confirming the system remains compliant or detailing any defects found.

Keep these alongside the design drawings and the logbook. Together they form the documentation pack a competent person, insurer or fire authority will want to see.

The Electrician's Role and What to Quote For

Emergency lighting can be a one-off install or — more valuably — a recurring maintenance contract. When you scope and quote, make sure you capture the full picture rather than just the fittings:

• Design and survey: reviewing the building against the fire risk assessment, plotting luminaire positions to hit illuminance and siting requirements, and producing drawings.
• Supply and install: luminaires, exit signs, wiring (fire-rated where central-battery), test facilities and final commissioning.
• Commissioning certificate to BS 5266 and handover of the logbook.
• Annual maintenance contract: the monthly test (or oversight of the client doing it), the annual full-duration discharge test, battery replacements and a periodic test certificate. Price this as a recurring line — it's predictable, sticky revenue.
• Battery and lamp replacement: batteries typically last around 4 years and lamps wear too — build replacement cycles into the long-term cost so the client isn't surprised.

Quote the install and the maintenance as separate lines. Clients who see the recurring obligation spelled out are far more likely to take the contract from you rather than forget about the system until an inspector turns up.

The Premises Owner's Legal Duty

It's worth being explicit with clients about where the legal liability sits, because it isn't with you. Under the Fire Safety Order, the Responsible Person for the premises must ensure emergency lighting is provided where needed and kept in working order. That duty cannot be contracted away to the electrician — but it can be discharged by appointing a competent person to maintain the system and keep the records.

Failure to comply is a criminal offence. Enforcement ranges from improvement notices through to prohibition notices and, in serious cases, unlimited fines and imprisonment. For most owners, the practical risk is a fire safety audit that finds an untested system with no logbook — at which point a maintenance contract that should have cost a few hundred pounds a year becomes an enforcement problem. Framing your quote around removing that risk is far more persuasive than selling on price alone.

Quick Reference: Emergency Lighting Requirements