Knowledge article
Emergency Lighting Monthly Testing
A monthly emergency lighting test briefly simulates mains failure to confirm every luminaire illuminates, with the result recorded in the logbook per BS 5266.
BS 5266 recommends a brief monthly functional test of emergency lighting. Its purpose is simple: to confirm that every luminaire illuminates when the normal supply is lost.
How the test works
The supply to the emergency luminaires is briefly interrupted — typically via a test key or switch (or a dedicated test facility in an automated system) — simulating mains failure. Each fitting should light immediately. The test is kept short so batteries are not deeply discharged (a full discharge is reserved for the annual test).
What to check
- Every luminaire and exit sign illuminates.
- No fitting shows signs of a failed lamp or battery.
- On restoration of supply, charging indicators return to normal.
Recording the result
Log the test in the emergency lighting logbook, noting the date and any faults. Rectify failures promptly. Consistent monthly testing is the simplest way to keep the system reliable and to demonstrate the responsible person is meeting their duty. The deeper check is the annual duration test.
Frequently asked questions
How is the monthly test carried out?
The supply to the emergency luminaires is briefly interrupted — using a test switch or key — to simulate mains failure, confirming each fitting illuminates. The test is kept short so batteries are not deeply discharged, and the result is logged.
Related service
Emergency Lighting Testing
Function and duration testing of emergency lighting to support BS 5266 good practice.
Learn moreMore in this topic
Knowledge article
Emergency Lighting Annual Duration Testing
The annual emergency lighting test discharges the batteries for their full rated duration (commonly 3 hours) to confirm the system lasts the required period.
Learn moreStandard explained
BS 5266 Overview: Emergency Lighting Standard
BS 5266 is the UK code of practice for emergency lighting — covering design, installation and maintenance so illumination is provided when the normal supply fails.
Learn moreKnowledge article
Common Emergency Lighting Defects
Common emergency lighting defects include failed batteries, faulty luminaires, missing coverage, no logbook and fittings that light up but fail the duration test.
Learn moreKnowledge article
Emergency Lighting Explained
Emergency lighting provides illumination automatically when the normal supply fails, helping people evacuate safely — governed by BS 5266.
Learn moreThis article provides general guidance and distinguishes legislation, British Standards and good practice. It is not legal advice. Always confirm the specific duties applying to your property and tenure.