I have hooked up a circuit(not very big) to a dc supply from my big (80Ah,12v)battery.But the wire had to be taken to my upper floor and it seems the wire shares some pipes with the AC wires of the house. I know this is not advisable. But now ,whenever any switch that is sharing the pipes is flicked ,my circuit gets interrupted. I am thinking that the change in current in the AC wires are inducing a signal in my DC.(But I have no way to verify and it is only a guess) I tried hooking up a couple of capacitors but i didn't help. If there is no other way ,I was thinking of connecting a smaller 12v battery in parallel near the circuit.Would this work? Is there any other way?