14. Lighting Fittings / Layout

14.8 Lighting Fitting VI

Emergency Lighting

Description :

Eit sign plate, wall or ceilng-mounted, c/w 1x18W fluorescent tube, clear acrylic sheet, integral control gear and all necessary accessories.

Locations :

Stairs, Emergency Exit Doors, Lift Lobbies.

Uses :

All exits and escape routes in places of public assembly must be clearly identified by signs reading 'Exit' or 'Emergency'. They are used for the provision of safety around buildings.

BS 5266 defines three functions for escape lighting :

• To define escape routes in building ( in case of fire ) clearly and unmistakably, and to indicate the exit.
• To illuminate such routes, thus allowing safe movement towards the exits.
• To illuminate fier alarm call points and fire-fighting equipment

Effect :

Emergency ligthing for the above purposed may be of two kinds, a maintained systwm and a non-maintained type sysetm. In T.T.T. Building, maintained system is used with all emergency lamps in operation at all times. This has the advantage that failuer of either circuit or lamp will be immediately obvious, and can be rectified before an emergency arises.

For buildings like T.T.T. Building, the required illuminance of the exit sign is 0.2 lux; and where the general service illuminance in the room is more than 500 lux, this should be increased to 0.5 lux. There is no particular spacing laid down for illuminaires along the exit route; experience and an inspection of existing buildings, may provide the best guide.

Exit sign plate in the lobby

 14.9 Integration of Natural Lighting and Artifical Lighting

 Table of Content

 14.7 Lighting Fittings III