3. Safety lighting

3.1 General design (EC 7)

Emergency lighting must be on standby during operation.

Emergency lighting is switched on or maintained in service in the event of failure of the "normal – replacement" lighting system.

If the "normal – replacement" power supply fails, the emergency lighting is supplied by a safety source with a rated operating time of at least 1 hour.

It includes either :

• a centralized source consisting of a battery of accumulators supplying luminaires (figures 1 and 2...