Emergency lights - maintained vs non-maintained

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The non-maintained lights will only come on in the event of a power failure.
The maintained lights you can also use as normal. :)
 
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Sustained lights have two lamps, basically a normal lamp and a non-maintained emergency light.
The normal lamp can be switched, very similar concept to a maintained unit but the maintained unit only having the single lamp for both duties.
 
what about the exit signs in our shop then, which are permenantly lit? what are they called?
 
How many lamps in them?
Probably maintained, with a wire loop between L and Ls.
That is assuming they are self contained (have their own battery pack in them).
 

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