I'll tell you what happened. I stopped paying attention. Plain and simple. I was caught up in my work, and lost sight of the location of the wire. A big white birch. Fat sucker. Years ago someone reduced the height to keep it dead even with the service lines into the house. We were working.next door, and the lady asked.me to reduce it again while we were in the neighborhood. It was cut down properly to laterals last time. Those laterals produced some shoots that shot up straight about 8 feet. Easy quick task. Climb up, tie in, nip those shoots off. I lost sight of the wire. Laid a shoot on it. My elbow touched the butt of the limb as I reached my saw around to clip onto my saddle. The insulation was worn off on the wire in that spot, and i was unaware that it was on the wire. It rattled me good for a solid 4 seconds. Numbed my whole arm for an hour and my heart kept racing on me. Maybe it was fear causing it. Either way, my guys raked up in a jiffy, and hauled ass down to the hospitol to get looked at.