Safe, Productive Wire Pulling Starts with equipment properly sized for the forces that will be generated in the pull; with wires of a certain dimension or weight, productive wire pulling often relies on powered wire pullers. For high-force cable pulling, many manufacturers recommend using double-braided polyester rope, which has a high strength-to-size ratio and a "low stretch" that stores relatively low energy. Featuring greater capacity than previous types of ropes, such as polypropylene, the polyester rope, which can generally be used for many pulls, has a built-in safety factor. For conduit pulls, it indicates the tensile strength (the greatest longitudinal stress the rope could bear without tearing apart), which in comparison to the rated working capacity, is often 3 to 1. For aerial pulls, which involve lifting and pulling, a higher 5-to-1 ratio is typical.
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