Fatality Assessment and Control Evaluation (FACE) for Colorado: Two Workers Were Injured (One Died and One was Hospitalized with Burns) When the Truck-Mounted Conveyor They were Using was Raised and Contacted a 7,620-Volt Overhead Power Line

摘要

On August 1, 1994, a crew of three employees of a roofing supply company were delivering roofing materials to a one-story residential building. The materials were on a flat-bed truck equipped with a truck-mounted hydraulic-operated conveyor. The conveyor is designed to facilitate easy transport of materials directly from the truck to the rooftop. One end of the conveyor is fixed to the back of the flat-bed with the other end resting on the truck cab when the truck is in transit. On arrival at the site, the driver parked the truck under a 7,620-volt power line. He was instructed to raise the conveyor (which then is in an angled position) and rotate it to the roof edge which was behind the truck. The controls for the conveyor were located at the fixed end of the conveyor. He climbed onto the flat-bed to operate the controls. The other members of the crew stood on opposite sides of the flat-bed with their hands resting on the truck to observe the driver. As the conveyor was raised, it contacted the power line which energized the conveyor and the truck. The position of the two crew members observing the operation provided the path to ground for the electrical charge. One was fatally injured and the other received severe burns. The truck driver operating the controls was uninjured because he was not grounded.