Having decided on your basic system, consideration should now be given to the siting of the lighting units and signs within the particular premises involved. This will then form the basis on which your selection of equipment can be made.
Lighting units and signs should be sited so as to clearly show the exit routes leading to the final exits from the premises. Where the exit route or final exit is not readily identifiable a sign should be utilized rather than a lighting unit. Particular attention should be paid to individual stairways, changes in level, corridor intersections, changes in direction, the outside of each final exit, control/plant rooms, lifts, toilet areas over 8m2 (although in some peoples opinion all toilets of public access and especially those for the disabled should have emergency lighting). Access to fire alarm call points, fire fighting equipment, should be clearly illuminated.
In general, if common sense is used when siting the luminaires and signs to cover these areas, then the completed scheme will meet most requirements.
Note. Detailed computer point calculations or luminaire manufacturers spacing tables should be used.
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