I purchased a new dimmer switch (metal plate) and wanted to install it replacing my existing standard white plastic switch. I noticed that I only have two wires coming out of the wall a red and black but no bare "earth" wire ??
When investigating other boxes I noticed that all have a bare copper wire connected to the metal box in the wall, this box didn't for some reason. I believe it is hidden somewhere under the plaster.
My new dimmer switch has an earth wire. Should I simply connect this to the metal box in the wall or do I need the bare "earth" copper wire for it to be earthed correctly ?? i.e. does connecting the earth wire of the dimmer switch to the metal box in the wall mean it is earthed ??
I hope I haven't confused you.