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I have a little UPS for my building stairs due to Electric Load shading also complete wiring snapshot attached. Now the problem is I need attached timer switch in my exiting wiring because I need battery backup or UPS output using only in night and don’t need in day. I don’t know how to possible I attached timer switch in my wiring please guide me but one things remember UPS start only then Electricity down and timer switch required (hot line wire / face wire / positive wire) and neutral and forward the same hot wire and neutral and my UPS start output then electricity is down and provide own hotline and neutral.
 

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