How to Test Emergency Lighting in Your Building

A green charging indicator is not proof that an emergency light will work when the mains supply fails. The only reliable way to know is to test it properly, record the result and deal with any faults without delay. Knowing how to test emergency lighting helps protect people using your building and supports your wider fire-safety responsibilities.

Emergency lighting is designed to illuminate escape routes, exits, stairs and high-risk areas during a power cut. It gives people enough light to leave safely, especially when normal lighting has failed at the same time as an emergency. Whether you manage an office, shop, rental block or hospitality venue, testing needs to be planned rather than treated as a quick switch-off at the end of the day.

What emergency lighting tests are checking

Most emergency fittings contain a battery, charger and lamp or LED module. When the normal lighting circuit loses power, the fitting should switch to battery power automatically. A maintained fitting is normally illuminated all the time, while a non-maintained fitting comes on only when the regular lighting fails.

A test checks more than whether a light appears to work. You are looking for a fitting that changes over correctly, provides usable light along the escape route and stays on for its specified duration. In many commercial installations, this is one or three hours, but the required duration depends on the building, its fire strategy and the original design.

The frequency and detail of testing should reflect the building’s fire risk assessment, the type of system installed and applicable standards. Monthly functional checks and an annual full-duration test are widely used arrangements, but a competent electrician can confirm what is appropriate for your premises.

Before you test emergency lighting

Choose a time when the building is quiet and the test will not leave occupants at risk. Do not carry out a lengthy discharge test when staff, customers or residents may need the normal escape route lighting, and avoid testing immediately before a busy period. In larger or higher-risk premises, notify relevant staff and ensure an alternative safety arrangement is in place.

Check that the fittings have had enough time to recharge since the last test. A battery that has recently been discharged may need up to 24 hours to return to full capacity. Testing again too soon can create a misleading failure and leave the system less prepared for a genuine power loss.

You should also have an emergency lighting logbook or a clear digital record ready. This should identify the date, test type, person carrying it out, any defects found and when repairs were completed. Good records show that faults have been acted on, not simply noticed.

How to test emergency lighting: the monthly functional test

The monthly test is usually a short functional check. Its purpose is to confirm that each emergency fitting operates when the normal supply is interrupted, without significantly draining the batteries.

Where a dedicated emergency lighting test key switch is fitted, use the correct key to simulate a failure of the normal supply. Do not switch off circuits at the consumer unit or distribution board unless you are competent and know exactly what else is supplied by that circuit. Turning off the wrong circuit can affect alarms, security systems, refrigeration, IT equipment or other essential services.

Once the test key is operated, walk the relevant routes and check that emergency fittings illuminate. Look at corridors, staircases, final exits, changes in level, fire alarm call points and any externally lit escape route. Exit signs should be clearly visible and directional signs should still make sense from the route people will take.

The short test should only last long enough to verify correct operation. Restore the normal supply, then check that the charge indicators return to their normal condition. If a fitting does not illuminate, flickers, appears unusually dim or has a fault indicator showing, record it as a defect and arrange repair.

Automatic testing systems can make this process easier. They schedule functional and duration tests and may report failed fittings to a central panel or building management system. They still need reviewing by a responsible person, because a recorded fault is only useful when someone arranges corrective work.

Carrying out the annual duration test

The annual test is more demanding. It verifies that the emergency lights can operate for the full rated duration, often one or three hours. This test is best scheduled when the building can be safely vacant or when suitable temporary precautions have been agreed.

Start the test using the designated test facility, then allow the fittings to remain on battery power for their full required duration. At the end of the test, inspect every fitting and escape route. The aim is not merely to see points of light. You need enough illumination for people to identify hazards, follow the route and leave the building safely.

Pay particular attention to batteries that fail near the end of the test. A light that works for ten minutes but fades before its required duration is not compliant for its intended purpose. Discoloured lenses, damaged diffusers, loose fittings and obstructed exit signs should also be recorded and corrected.

After restoring the supply, allow sufficient recharge time before the building returns to normal use. If the test has exposed several failures, consider whether interim measures are needed while repairs are completed. This may include restricting the affected area or providing suitable temporary lighting, depending on the risk assessment.

Common faults to look for

Emergency lighting failures are often gradual, which is why routine checks matter. Battery deterioration is common, particularly in older fittings or in areas with extreme temperatures. A permanently lit charge indicator can still mask a battery that no longer holds enough power.

Other frequent issues include failed LED drivers, corroded connections, damaged test switches, missing signage and alterations to the layout that leave a new doorway, corridor or staircase without adequate coverage. Refurbishments can also create problems when partitions, shelving or displays obstruct an existing emergency fitting.

If a fitting fails, do not assume replacing the battery is always the right answer. Some fittings are sealed units, while others may have charger or circuit faults. A qualified electrician can identify the cause, replace components where appropriate and advise when upgrading to modern LED emergency lighting is more cost-effective.

Who should carry out the testing?

A responsible person may carry out straightforward routine visual and functional checks if they understand the system, have access to the correct test facilities and can keep accurate records. This is often suitable for a trained facilities manager, caretaker or appointed member of staff.

However, annual duration testing, fault diagnosis, repairs, changes to circuiting and assessments of emergency lighting coverage are better handled by a competent electrician. This is particularly true for larger premises, shared residential areas, licensed venues, care settings and sites with central battery systems or automatic test equipment.

Landlords should not overlook communal spaces. Escape routes in shared hallways, stairwells and car parks may require emergency lighting even where individual flats have their own domestic lighting arrangements. Requirements depend on the property layout and fire risk assessment, so a site-specific review is the sensible starting point.

Keep a clear emergency lighting logbook

A logbook turns testing into a manageable safety process rather than a memory test. For each check, record the date, the areas or fittings tested, the test duration, the result and any action taken. Where a defect is found, note when it was repaired and who completed the work.

For businesses and property managers, these records can be valuable evidence during fire-safety reviews, inspections or insurance queries. They also help identify repeat failures, such as a fitting in a cold external location that is repeatedly losing battery capacity.

If you are unsure whether your emergency lighting is adequately designed, tested or documented, arrange a professional inspection before a fault becomes an avoidable risk. Centralec Electrical can test, repair and upgrade emergency lighting across Bristol, Bath, Weston-super-Mare and the surrounding areas, with clear advice and no hidden costs.