Abstract: An electrical contractor and a local electric cooperative were working together to deenergize and reroute power lines at a substation and to upgrade equipment in the substation. The electric utility had previously dispatched crews to isolate lines going into the substation. One of the power line workers on the contractor's crew was climbing a support tower to begin rewiring work. He contacted a live bypass jumper energized at 7200 volts. The employee was electrocuted. (He also fell 3.0 to 3.5 meters to the ground.) The line had been tested before the accident and presumably found deenergized.