I’m doing some work at my dad’s house, getting it ready for sale. In doing so I encountered a light switch inside the bedroom wired to a hallway light. Obviously this was a problem so I decided that the easiest, less wall destructing method would be to wire the switch to the outlet below. First I shut off the power, the circuit was labeled (#6) and a quick confirmation with the DMM (digital multi-meter) told me that the power was off. With the power off I was safe to begin removing the recessed light in the hallway from the circuit.
Once the light was removed it was a matter of opening up the light switch back box. The purpose being the removal of the actual wire that is no longer needed.
So – whats happening here: The black wire (hot, meaning the ‘feed’ for the electric) is coming from below inside the wall, is interrupted by our interrupter aka switch, and continues up through the wire that we are removing. Then, in that same bundle of wires the white wire (the return) completes the circuit by returning from the light that was removed, back all the way to the breaker box. This is why the white wires are connected. Then, there are some other wires but I am not going to get into that today.
I removed the black wire from the switch and removed the white wires from the wire nut. Then I removed the collar from the back box and gave the wire a healthy tug from the otherside (hallway side) and it came right out. Then I fished a new line of BX down to the electrical outlet. This then allowed me to re-route the feed of electricity from the outlet below, up through to the switch, then back down to the outlet. Thus, interrupting the power source giving us the desired effect. Once this was done I put everything back together and into the wall and turned on the power and tested. ALWAYS TEST! This is important because you run into weird things sometimes (like accidental 3-way switching, etc.)