I understand how an electric fence works. The animal touches the (hot) wire while standing on the ground and the current flows through. So how can I do this to the top edge of a 6' wooden fence to deter raccoons? I was thinking of running two wires. The ground wire stapled to the top edge of the fence. Then run the hot wire about 6" higher. The raccoons will need to stand on the top edge while climbing over and hit the other wire thereby completing the circuit. Will this work?