By Application:    Architectural Laboratory Water Treatment Marine Air Handling

PVC duct

A private contractor had previously inserted an 1800 pound test strength, synthetic flat tape (called a mule tape) through an underground 4 inch diameter pvc duct, 1000 feet long. The crew planned to connect the first truck's wire winch cable to the tape at the first manhole and pull the cable through the duct to the substation. There they planned to connect the utility cable to the wire and pull 1900 feet of it, in one piece, back through the length of duct. Usually, they pulled a maximum of 600 feet and another crew later spliced the cable sections together. The wire cable could be pulled by hand or with the assist of a power uptake reel.
They pumped water from the ducts and connected the tape to the wire cable. Using the power uptake reel, about 400 feet of wire cable was pulled from the first manhole to the second. The victim and his colleague were pulling the mule line at the hut. The senior technician went to the hut and saw that the line was taunt and feared it might break. Although the winch line was on "free drum," there was still resistance when the wire cable was pulled. To decrease the resistance and make pulling the tape easier, the crew pulled out about 500 feet of wire cable and laid it, snakelike, on the ground at the center manhole. Although workers at the middle section saw the cable advancing, the two men at the hut thought the tape was tight and on the brink of breaking. The workers had experienced situations in the past in which the tape had broken. The two unhitched their trailer and drove their truck to the middle hole where they put their capstan wheel on the other truck and walked back to the substation. The victim worked outside and his co-worker worked inside the building, pulling the tape by hand out of the duct through a porthole. It was becoming very difficult to pull the line, possibly due to sludge in the line, but the co-worker thought it was advancing without a problem. He heard noise in the duct, as if the cable was coming through.

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