falexandru:
I was talking about 220V/110V house supply wires into the walls -to detect (and measure).
OH, I see what you mean. Using a non-contact method. You did mention electromagnetic detection -- my bad 
falexandru:
I was talking about 220V/110V house supply wires into the walls -to detect (and measure).
OH, I see what you mean. Using a non-contact method. You did mention electromagnetic detection -- my bad