Emergencies such as fires or mains power failures necessitate emergency lighting which illuminates automatically, especially along escape routes enabling people to vacate a building quickly and safely.
There are three basic types of emergency lighting.
Non-maintained – Emergency lighting only illuminates in the event of a mains failure.
Maintained - Emergency lighting remains illuminated at all times using the same lamps for both normal and emergency operation.
Sustained – The emergency lighting is fitted with two lamps. One operates on mains AC supply, the other operates from a battery supply in the event of mains failure. This is essentially a non-maintained system with the addition of mains lamps that should be illuminated whenever a building is occupied.
EN 50171: Central Battery Systems
EN 50171European legislation specifies the general requirements for central power supply systems governing independent energy supply to essential safety equipment. This standard covers systems permanently connected to AC supply voltages and using batteries as the alternative power source.
Emergency lighting is prone to high inrushes and power surges. To cope with this demand, static inverters must be able to operate at continuous overload without affecting the load or their stability. Batteries are required to attain an 80% recharge rate within 12 hours and must provide three hours of run time after being fully discharged every 12 months.
Therefore it’s important to select the most suitable range of static inverters that meet standards above and beyond EN 50171 requirements.