When normal lighting fails, people still need to find escape routes, fire exits, stairwells and safety equipment without hesitation. This commercial emergency lighting testing guide sets out what responsible duty holders and facilities managers should check, how often to test, and what to do when a fitting does not perform as it should.
Emergency lighting is not something to leave until an inspection is due or a power cut exposes a problem. Batteries deteriorate, indicator lamps fail, fittings become obstructed and changes to a building layout can leave an escape route poorly lit. Regular testing gives you time to put faults right before an emergency does.
What emergency lighting testing is for
Emergency lighting is designed to operate automatically when the normal lighting supply fails. In a commercial property, it supports safe evacuation and can help staff, customers, residents and visitors move through the premises in low-light conditions.
The system may include maintained fittings, which stay illuminated during normal use, and non-maintained fittings, which come on only when the mains supply fails. Illuminated exit signs are often maintained, while fittings on corridors, staircases, open areas and external escape routes may be either type depending on the design.
Testing checks more than whether a green indicator light is showing. It confirms that the fitting changes to battery supply, continues operating for the required duration and recharges correctly afterwards. It also provides a record that the premises are being properly managed.
The exact arrangements should reflect the building, its fire risk assessment, the lighting design and the system installed. British Standards commonly used for emergency lighting include BS 5266 and BS EN 50172. A competent electrical contractor can advise where older installations, extensions or changes of use make the existing system unsuitable.
Commercial emergency lighting testing guide: the core routine
For most self-contained emergency lighting systems, testing follows a straightforward pattern: regular visual checks, a monthly functional test and an annual full-duration test. A building with central battery systems, automatic testing equipment or specialist risks may need a different routine, so the manufacturer’s instructions and site records should always be considered.
Regular visual checks
A responsible person should keep an eye on the system between formal tests. This can be part of routine building checks, particularly in busy premises such as care homes, warehouses, offices, shops and communal residential areas.
Look for damaged or missing fittings, discoloured diffusers, blocked exit signs, failed status indicators and changes to the building that affect escape routes. New partitions, stored stock, signage, racking or furniture can all reduce the usefulness of an otherwise working fitting.
Where a central power supply is used, visual inspection of indicators and controls may be needed more frequently. Any warning light or fault message should be investigated rather than simply reset.
Monthly functional test
A monthly test normally involves simulating a mains failure long enough to confirm that each emergency fitting switches to its battery supply and illuminates. This is often carried out using a test key switch, test device or the system’s built-in controls.
The test does not usually need to run for the full emergency duration. The purpose is to prove that the lamp, battery and changeover function operate. Walk the relevant areas while the normal lights are off or isolated for the test. Check that escape routes, changes of direction, fire alarm call points, fire-fighting equipment and exit doors remain clearly visible.
After the test, restore the normal supply and check that charge indicators return to their normal condition. Record the date, areas tested, result and any faults found in the emergency lighting logbook.
Monthly tests should be planned sensibly. Carrying one out during trading hours or while a care setting is busy can cause confusion and create avoidable risk. It may be better to test in sections or arrange testing outside peak activity, provided the premises remain safely managed.
Annual full-duration test
The annual test is the more demanding check. It simulates a full mains failure for the system’s rated duration, commonly three hours, although the required duration depends on the installation and risk assessment.
All relevant emergency lighting should remain illuminated for the full period. The test should then include a check near the end of the duration, when battery performance is most likely to show a weakness. A fitting that works for a few minutes but fades before the required period is not providing the protection it was installed for.
Because batteries need time to recharge afterwards, avoid scheduling a full-duration test immediately before the building will be occupied during a period of higher risk. This matters for premises open late, sites with night staff, nursing and care environments, and buildings with limited daylight. If the building cannot be left without fully charged emergency lighting, testing may need to be phased or alternative precautions agreed.
How to carry out a useful test
Testing should be systematic. Start with an up-to-date list or plan showing every emergency fitting, exit sign and test point. Without one, it is easy to miss lights in plant rooms, toilets, external routes, stairwells or less frequently used corridors.
Before isolating the supply, let people on site know what is happening. Staff may assume there is a real power failure if lights change unexpectedly. In premises with security systems, access controls, machinery or vulnerable occupants, check whether the test could affect other equipment or normal operations.
During the test, inspect the actual lighting coverage rather than only the fittings. A lit unit does not automatically mean the route is safe. Look for dark patches at stairs, level changes, intersections and exit doors. Confirm that signs can be seen from the direction people will approach them and that the final exit route remains clear.
Once normal power is restored, check for fittings that have not returned to charge, alarms showing faults or lamps that remain dim. Record every result, including satisfactory tests. A complete record is more useful than a logbook containing only failures because it demonstrates the maintenance routine has been followed.
Keep an emergency lighting logbook
Your logbook can be paper-based or electronic, but it should be accessible to the people responsible for the building. It should identify the system, test locations, test dates, results, defects, remedial work and the person who carried out the check.
For larger sites, a numbered lighting plan makes fault reporting far quicker. “Emergency light failed near loading bay” can become “Fitting EL-24, rear loading-bay exit route”, allowing the electrician to attend with the right information and reduce time on site.
Keep records of alterations too. If an office becomes a storage area, a unit is subdivided, or a caravan park facility is refurbished, the emergency lighting arrangement may need reviewing. More fittings are not always the answer, but the lighting must still suit the revised layout and occupancy.
Common faults and what they usually mean
A failed indicator light may point to a charging issue, failed battery, lamp fault or a problem with the fitting itself. Older units using fluorescent lamps may suffer from worn lamps or components, while LED emergency fittings still rely on batteries and control gear that have a limited service life.
Short run times are a common issue. Batteries can appear acceptable during a brief monthly test but fail during an annual duration test. Replacing the battery may solve the problem, but on older fittings it is often worth considering whether replacement with a modern LED unit is the better long-term option. The decision depends on the age of the system, access requirements, the condition of the fittings and the cost of repeated repairs.
Physical damage also matters. A cracked diffuser, loose fitting, painted-over test indicator or obstructed exit sign can compromise the system even if it illuminates. In industrial and warehouse settings, impact damage from handling equipment is a particular risk. In public-facing premises, fittings can be affected by redecorating, ceiling works or unauthorised alterations.
Do not ignore repeat faults. If several fittings lose charge early, the cause may be unsuitable battery types, high ambient temperatures, a supply issue or an installation reaching the end of its serviceable life. Replacing one failed unit at a time may be false economy if the wider system needs attention.
When to bring in a qualified electrician
Routine monthly checks can often be completed by a trained, responsible member of staff, provided they understand the system and the premises. Repairs, replacement fittings, wiring faults, changes to coverage and annual testing are best handled by a competent electrician, particularly where the site is complex or occupied.
Professional support is particularly useful after a failed full-duration test, building alteration, fire risk assessment review, change of tenancy or repeated battery faults. It is also sensible when no drawings or logbook exist, as the first task may be establishing exactly what has been installed and whether all required areas are covered.
For commercial properties across Lancaster, Morecambe, Heysham, Carnforth, Caton and Forton, NS Elec Ltd can help with emergency lighting testing, fault finding, replacements and planned electrical maintenance. Clear records and properly working fittings make compliance easier, but more importantly, they give people a safer route out when normal lighting is no longer there.
A test is only worthwhile if faults are acted on. Treat a failed fitting, poor light level or missing record as a job to resolve promptly, not a note to carry forward to next month.