Additional care should be taken while using power tools in areas with limited fields of view. Two technicians were performing demolition work on ductwork in a space being prepared for new experimental equipment. The workers were using a reciprocating saw to cut through the very heavy duty ductwork. The technician proceeded by cutting the bottom out of the duct, supporting the duct with a Genie table lift and then working from inside the duct with the reciprocating saw. He could not see the outside of the duct while he was cutting. During the cutting activity the tech cut through a smoke detector conduit that was run directly next to the duct.
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