Emergency lighting systems
These are used for lighting in the event of a power failure when it is essential to quickly locate fire
fighting equipment and identify exit routes from the premises. Is ususally required to operate automatically and give illumination of a sufficiently high level to enable persons of all ages to evacuate the premises safely.
A note on Terminology:
Non-maintained - The emergency light is only illuminated on interuption of the mains power supply.
Maintained - The emergency light uses the same source for both mains, which is usually switched, and in emergency mode.
Sustained -The emergency light has a seperate light source for both mains and emergency mode and is often switchable.