Is it technically possible to produce a device that can be plugged into a standard wall socket that will remove, from the entirety of a small building's in-wall wiring, all signals in excess of 50/60Hz, ie. by shunting them to ground?
If so, please describe how the circuit would work, and where I might learn about the appropriate design procedure.
If so, please describe how the circuit would work, and where I might learn about the appropriate design procedure.