I am trying to wireup a UPS (old one bought for my PC once) to power one of my ceiling lamps so it works as an emergency light. (Stupid idea? Yeah? :P)
But since the ceiling lamp wiring is already done and in place, I have only access to its switch where you only have the live wire. The neutral runs as common for all other lights on that circuit.
Since I want to power this specific light from the UPS, how am I going to get its neutral sorted? I read somewhere that you should never connect the output of the UPS to its input (may be on its user's manual).
If I connect the UPS and mains neutrals together, will it end up in chaos? Please advice. Thank you.