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Non maintained emergency lights can be battery powered such that when mains is lost the inbuilt battery powers up the light for a period of time.
They are kept charged by the input mains voltage and are usually off when power is live
https://www.lampshoponline.com/led-emergency-maintained-bulkhead.html
freezing77
Electricians, what's the easiest way to integrate emergency lighting into a circuit?
Say I have 10 lights (a mix of normal bulkhead lights, interspersed with non-maintained combined emergency lights) that are all operated by a single switch, does this mean that the emergency lighting would turn on every time I switch the other lights off? Would I need to run a permanent live to the emergency lights?
Essentially I want to light a big room and operate the lot with one switch, but have half the lights function as emergency lights. Is this stupid? Should I just have some emergency lights on an entirely separate circuit?