I live in a house built in 1909. Most of the wiring is very old knob and tube. I would like to replace a dining room light switch with a dimmer switch.
Two wires come out of a metal box and screw into the existing switch. They are unmarked. I assume that one is from the power source, and one is the return. The switch just completes the circuit.
My new dimmer switch has a white wire, a black wire, and a green (ground) wire. I believe that the white wire should be connected to the hot wire coming from the wall, and that the black wire should be connected to the return.
But, I have come accross some problems:
- It doesn't appear that the (metal) box is grounded. I have a simple
- Since I don't think I have a ground, I can't tell which of the two wires coming from the box is hot, and which is the return.
- I am not sure how to wire this dimmer switch, and even if it is advisable with the way my house is currently wired.
NOTE: the dimmer switch has a knob, and also a push-button.
I have only a vague understanding of all things electrical, so sorry about the vocabulary and long-winded explanation.
Thanks for any help!
Felix