From the types of emergency lighting power supply and the conversion time requirements, it is not difficult to see that the continuous working hours of emergency lighting are subject to certain conditions. It is usually stipulated that the continuous working time of evacuation lighting should not be less than 30min. According to different requirements, it can be divided into 6 grades such as 30, 60, 90, 120, 180min. The continuous working hours of the backup and safety lighting should be based on the specific requirements of the place of use.
For the emergency lighting system connected to the power grid or generator set, the continuous working time is easy to meet the requirements; for the battery-powered emergency lighting system, the working time is limited by the capacity, and it is not suitable for the place where the continuous working time is required. When using a battery pack, consider using it with a generator set. In this case, the battery pack is powered, only as a transition to emergency lighting, so its continuous working time can be appropriately reduced. When selecting emergency lighting power, the continuous working time should be determined according to the specific situation.
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