How To Find Electrical Wires In Walls. I have taken the front plate off and the switch works. Depends on your local electrical codes.
Most house wires—the wires that run from the service panel through walls and to electrical beware:
There is electricity on the wires leading out of the box when the switch is on. Continue listening for a persistent beeping sound, which indicates the location of the electrical wire in your wall.11 x research source. There are several methods for running cable through finished walls, and the approach you take will depend on the circumstances and how extensive the work will be. Depends on your local electrical codes.