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Phillcbr400
This setup is used on railway in places for essential equipment. Delve into it further before disconnecting, if its only lights tho I can't see why it would need to be! Is this building domestic or commercial?
Yes very confusing, I still think it may be an essential / non essential system somehow, (looks that way to me) and due to the generator, seems like it may have something to do with that, but the schematic doesn't make sence and seems almost dangerous, sorry fella, I don't think I can help with this one and it mut be something we UK sparks don't get involved with, hence the confusion, maybe tony or E54 may have an idea when they see the drawing Fella.
Mike