Hello,
Inside of my light switch box, I see that conduit tubes is used with one red and one blue wire coming out of it. There is no white neutral or bare cooper wire inside either. I live in a post war apartment building.
I was told by an electrician that the junction box itself could act as a ground. But inside the wall cavity where the junction box lies, it is solid concrete as there's no soft spots such as a wood beam or drywall to attach a screw with the neutral and ground wires from the MS-OPS2 attached to it.
Any suggestions or tips on how to get around this?
Thanks.