Emergency Light Testing
Emergency lighting is for an emergency situation when the main power supply is cut and any normal illumination fails. Emergency lighting is normally required to operate fully automatically and give illumination of a sufficiently high level to enable all occupants to evacuate the premises safely.
The legal requirement is that non-domestic buildings must be safe at all times, even if mains power failure occurs. Therefore, nearly all such buildings must have emergency lighting fitted.
It is common to test the emergency lighting during the fire alarm maintenance visit.