I worked for an outfitter in Wy that was one of the first to use electric fence around the Fall hunting camp in Grizzly country. That was 1985. We were working with Gallagher Fencing and they instructed us to set the fence up like we were fencing out hogs. The fence was only about waist high, with 3 wires. Top and bottom were hot and middle was a grounded into 18 ft of cooper rod. The idea was for the bear to touch the hot and ground together with his head and get the full 7000 volts. It worked fabulously and we slept much better. The Forest service told us that it would not work, but now they tell people it is great and that they thought it up. Typical Govt. agency mentality.