A power cut, fire alarm activation or damaged electrical circuit can turn a familiar corridor into a hazard within seconds. When you test emergency lighting properly, you are checking that people can find a safe route out when the normal lighting supply fails. For landlords, facilities managers and commercial operators, this is a practical safety task that needs planned attention, not a box-ticking exercise.

Emergency lighting is designed to operate automatically if mains power is lost. However, batteries degrade, chargers fail, fittings become damaged and alterations to a building can leave escape routes poorly covered. Regular testing identifies these issues while there is time to put them right.

Why emergency lighting testing matters

Emergency lights support safe evacuation by illuminating escape routes, final exits, stairways, changes of direction, fire-fighting equipment and open areas where occupants may need to move towards an exit. In many properties, illuminated fire exit signs are also part of the emergency lighting system.

The responsible person for fire safety has duties under the Regulatory Reform (Fire Safety) Order 2005 to ensure fire safety measures are maintained. Emergency lighting testing forms part of that responsibility. The exact arrangements should reflect the building’s fire risk assessment, the type of system installed and relevant British Standards guidance, including BS 5266-1.

This matters particularly in offices, shops, communal areas, warehouses, dental practices and other premises that welcome staff, visitors or patients. A failed fitting might appear minor during daylight, but it can create real risk during an evacuation, especially in windowless corridors or stairwells.

There is also an operational benefit. Finding one weak battery during a scheduled inspection is far less disruptive than discovering a complete lighting failure during an incident or a fire safety inspection.

How to test emergency lighting safely

Most self-contained emergency lights have an internal battery, a charging circuit and a lamp or LED unit. They are commonly tested by temporarily interrupting the normal lighting supply using a dedicated test key switch. This simulates a mains failure and should cause the emergency fittings to operate.

Before testing, make people in the building aware. A short functional test can make corridors, toilets, stairs or work areas dimmer than usual, which may affect staff, visitors and customers. Avoid testing while people are using a poorly lit escape route, and consider the needs of anyone who may be less mobile or unfamiliar with the premises.

Never switch off electrical circuits casually to carry out a test. The test facility should be clearly identified and suitable for the system. If there is no suitable key switch, if circuits are unclear, or if emergency lighting has been altered, use a competent electrical contractor.

During the test, check that each relevant fitting illuminates and that exit signs remain visible. Walk the full escape route rather than only looking at lights from a central point. A fitting may be working but obscured, positioned poorly after a layout change, or too dim to provide useful illumination.

Look for cracked diffusers, loose fittings, water damage, discolouration, missing directional legends and signs of poor charging. Ensure escape routes remain clear too. Emergency lighting cannot compensate for stored items in corridors, locked final exits or a staircase blocked by equipment.

Monthly functional tests

A monthly test is normally a short simulated mains failure. Its purpose is to confirm that emergency lighting switches on and appears to operate correctly. The test period should be long enough to prove the fitting works but not so long that the batteries are significantly discharged.

The required duration and method can vary by system and site requirements. Follow the manufacturer’s instructions, your fire risk assessment and the testing regime established for the premises. After any test, restore the normal supply and check that the charging indicators return to their expected status.

Monthly checks are an opportunity to spot visible faults before they become a failure. If a light does not operate, stays unusually dim, flickers or fails to recharge, record the issue and arrange repair without delay.

Annual full-duration tests

The annual test is more demanding. It checks whether emergency lighting can operate for its required rated duration, which is commonly three hours in many commercial settings. Some properties may have a different specified duration, so the system design and fire risk assessment should always take priority.

A full-duration test should be planned carefully. At the end of the test, batteries may need time to recharge before the system can provide its full emergency duration again. This can be an issue in occupied premises, buildings with evening activity or sites that operate around the clock.

Schedule the test when disruption is lowest and when appropriate arrangements can be made for fire safety. Once the test is complete, inspect the escape routes while the fittings are running. A light that initially comes on but fades before the required duration has expired needs attention.

For larger, central battery or addressable systems, testing may be automated or require specialist knowledge. These systems can provide useful fault information, but the results still need reviewing and acted on. Automated testing reduces manual effort; it does not remove the need for accountable maintenance.

What to record in the emergency lighting logbook

A clear logbook demonstrates that checks have been completed and makes recurring faults easier to identify. Whether it is kept on paper or digitally, the record should be accessible to the person responsible for the premises.

For each test, record the date, the test type, the areas or fittings checked, the result, any faults found and the action taken. Include the tester’s name and the date a repair was completed. If a defect cannot be fixed immediately, document the temporary safety measures put in place and the planned repair date.

Good records are useful during fire risk assessments, audits, inspections and handovers between managing agents or site teams. They also stop faults being lost between shifts or repeatedly reported without resolution.

Common faults found during emergency lighting checks

Battery failure is one of the most common problems. Older batteries may no longer hold sufficient charge, even if the fitting appears normal when mains power is available. LED emergency fittings use less energy than older lamp types, but their batteries and electronic components still have a service life.

Other frequent faults include failed charging indicators, damaged bulkhead fittings, faded exit signage, incorrect directional arrows and fittings isolated after electrical works. Refurbishments can create further issues. Partition walls, new shelving, changed room layouts or relocated doors may alter the escape route and leave the original lighting layout unsuitable.

A fault does not always mean the whole system must be replaced. Sometimes a battery, LED module, charger or damaged diffuser can be replaced efficiently. If multiple fittings are ageing or the building layout has changed substantially, a wider upgrade may offer better reliability and coverage. The right option depends on the condition of the installation, access requirements, downtime and the findings of the fire risk assessment.

When to call a professional

Routine visual checks can often be managed on site by a trained, nominated person. Electrical faults, repeated battery failures, missing test facilities and annual discharge testing are better handled by a competent professional, particularly where a building has multiple floors, complex escape routes or central battery equipment.

Professional support is also sensible after a power surge, water ingress, fire, refurbishment or a change in how the premises are used. In a dental practice or healthcare-adjacent environment, testing needs to be coordinated around patients, clinical activity and continuity of service. Planned maintenance helps avoid unnecessary interruption while keeping essential safety systems under control.

MSM Site Solutions can support property managers and commercial operators with practical electrical maintenance, fault repairs and planned checks across Slough and surrounding areas. Where an emergency lighting issue is identified, prompt action protects both occupants and the day-to-day operation of the property.

A failed emergency fitting is easy to overlook until normal lights go out. Put testing dates in the maintenance calendar, keep the logbook current and deal with defects while they are still straightforward repairs. That is how a safety system remains ready when it is genuinely needed.