Emergency lighting is a self-descriptive term and is lighting for an emergency situation when the main power supply fails. The loss of mains electricity could be the result of a fire or a power cut and the normal lighting supplies fail. This may lead to sudden darkness and a possible danger to the occupants, either through physical danger or panic.
Emergency lighting is normally required to operate fully automatically and give illumination of a sufficiently high level to enable persons of all ages to evacuate the premises safely. Most new buildings now have emergency lighting installed during construction, the design and type of equipment is normally specified by the relevant local authority, architect or consultant.
Non-maintained – The emergency light is only illuminated upon interruption of the mains 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 separate light source for both mains and emergency mode, for Emergency Lighting.
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