Abstract: Two employees were delivering shingles to a roof. After loading the shingles onto the roof, one of the two employees began to swing the hydraulically operated boom back to its starting position. His coworker was binding a load to the front of their metal truck bed. The ground was wet and icy. As the operator was maneuvering the 12.2-meter-long Clearfield boom past a tree, the boom contacted a 7,000-volt overhead power line. Both employees received electric shocks. They were hospitalized for their injuries. The employees had received training from their employer on the hazards of high-voltage power lines and were taught to stay at least 3 meters away from overhead lines.