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my old fitting has x4 wires attached in total, to the little black box. x2 black wires in red casing and x2 red wires connected the new one way switch i brough has two connections "L2" and "Com". what way round do i put the wires in ??? there is nothing else connected to the light...

Good Morning, My mums just moved house and I'm helping her with some DIY, I'm really enjoying it have done loads of painting,replacing door handles, pluming in washing machine (for a office bod it's a huge step forward) As this is electrical I really want to double check the process...