Does anyone know if it is normal to have a small amount of voltage ie; 1-18 volts feeding back thru the ground wire in residetial circuits. I found an open ground in a junction box that feeds a few lighting and receptical circuits. I check it for a volt reading and got 12 volts. I thought there may be a problem with one of the swithes or fixtures so I disconnected one at a time and the volt reading went down as I disconnected each circuit. Is this normal? Any suggestions?