Emergency Lighting and Exit Signage
A clear, engineer-written guide to emergency lighting and exit signage — how lighting keeps escape routes visible when mains power fails, the main luminaire types, and how exit signs guide people out safely.
When a fire or power failure plunges a building into darkness, people must still be able to find and follow the way out safely. Emergency lighting and exit signage are the systems that make this possible: they automatically illuminate escape routes and point clearly to the exits the moment normal lighting fails.
These systems are a life-safety requirement, not a convenience. They must operate without warning, run on their own power for a defined period, and provide enough light along the whole escape route. This guide explains how emergency lighting and exit signage work and how they are arranged.
How it works
Why emergency lighting exists. Normal lighting depends on the mains supply, which can fail in a fire or power outage exactly when people need to evacuate. Emergency lighting is a separate, automatically powered system that comes on when the normal supply is lost, providing enough illumination for occupants to see the escape route, avoid hazards, and reach an exit. It is designed to operate even when the building is otherwise dark.
Backup power. Each emergency luminaire is backed by a power source that takes over instantly on mains failure. In a self-contained (single-point) system, every fitting has its own rechargeable battery kept charged from the mains; on failure it runs on its own battery. In a central battery system, a single battery bank or generator supplies many fittings over dedicated wiring. Either way, the system is sized to run for a required duration so people have time to evacuate.
Maintained versus non-maintained. Emergency luminaires operate in two modes. A maintained luminaire is lit during normal operation and stays lit on mains failure — used for exit signs and places that must always show, like assembly areas. A non-maintained luminaire is off during normal operation and only illuminates when the mains fails — common for escape-route lighting that is not needed while normal lighting works.
Lighting the escape route. Emergency lighting is positioned to cover the things people must see to escape: along corridors and the line of the escape route, at every change of direction and level, at stairs and steps, at exit doors, and at fire alarm call points and firefighting equipment. The aim is a continuous, adequate level of light from anywhere in the building all the way to a final exit and a safe place outside.
Exit signage. Exit signs mark the route and the exits themselves so people know which way to go without hesitation. They use a recognisable running-figure-and-arrow pictogram, are illuminated (usually maintained) so they remain visible when the lights fail, and are placed so that from any point an occupant can see a sign directing them toward the nearest exit. Together with the lighting, the signage turns a dark, unfamiliar route into a clear path out.
Main types
In the UAE
- Emergency lighting and exit signage design in the UAE follows the UAE Fire & Life Safety Code of Practice (referencing relevant international standards), enforced by Civil Defence — in Abu Dhabi, Abu Dhabi Civil Defence (ADCD).
- These systems require Civil Defence design approval, inspection and commissioning, must use approved/listed equipment, and must be periodically tested and maintained to confirm the rated duration is met.
- Coverage of escape routes, exits, stairs and the required backup duration are set by the code, and exit signage uses the standard illuminated running-man pictogram for clear, language-independent direction.
How GPR applies this
As an Abu Dhabi electrical and fire contractor, GPR designs and installs emergency lighting and exit signage — selecting self-contained or central battery systems, positioning maintained and non-maintained luminaires along escape routes, stairs and exits, and placing illuminated exit signs for clear direction from anywhere in the building. GPR sizes the backup duration, prepares the layout for ADCD review, and commissions and tests the system to UAE Fire & Life Safety Code requirements.
Frequently asked questions
What is the difference between maintained and non-maintained emergency lighting?
A maintained luminaire is lit during normal operation and stays lit if the mains fails (used for exit signs), while a non-maintained luminaire is off normally and only lights up when the mains supply fails (common for escape-route lighting).
How long must emergency lighting stay on after a power failure?
It must run on its backup power for a duration defined by the fire code so occupants have enough time to evacuate; the system’s batteries or central supply are sized to meet that rated duration and are tested to confirm it.
What is the difference between a self-contained and a central battery system?
In a self-contained system each fitting has its own battery, while a central battery system uses one battery bank or generator to supply many fittings over dedicated wiring, which can make central testing and maintenance easier.
Where must emergency lighting be provided?
Along escape routes and corridors, at every change of direction and level, at stairs, at exit doors, and at fire alarm call points and firefighting equipment, so there is adequate light all the way to a final exit.
Why do exit signs use a running-man pictogram?
The illuminated running-figure-and-arrow symbol is internationally recognised and language-independent, so anyone can immediately understand the direction to the nearest exit even in an emergency.