Im trying to change my light switch to a dimmer switch. However the wirings isnt what I had expected. There is an extra backstab wire aside from the hot and netural wire, there also no ground wire being used, and all the wires are the same color too.
What is that backstab wire for?
And is that exposed copper wire, inside the terminal, the grounding wire?
Why wasnt the white wire used?
Any advice or tips is greatly appreciated.