Breaking Down the Basics of Cable Pulling

SIDEBAR: Cable Pulling Rope Safety Tips

Rope is a critical link in the cable pulling system. Observe the following steps in the selection and use of cable pulling rope.

1. Select a rope with an average breaking strength at least four times the rated capacity of your puller (rope safety factor). A minimum safety factor of 4-to-1 is required for pulling inside of raceways with a minimum of rope length exposed. Higher safety factors are recommended if the pulling rope is exposed. Required safety factors are for new rope in good condition without kinks or splices. When pulling, avoid sharp corners, edges, wedging, or dragging over rough ground. Dirt and grit picked up by the rope can work into the strands, reducing its pulling capacity. If there is any question about the integrity of the rope, then discard it.

2. Use only low-stretch, double-braided polyester for high-force cable pulling. High-stretch ropes store energy much like a stretched rubber band. If, for any reason, there is a failure of the rope, pulling grip, conductors, or any other component in the pulling system, this “stored-up” energy will suddenly be unleashed. The whipping action of a rope can cause considerable damage, serious injury, or death. Confinement in the conduit will work against the whipping action of the rope by playing out much of this energy within the conduit.

3. Inspect rope thoroughly before using. Make sure there are no cuts or frays in the rope. Remember the rope is only as strong as its weakest point.

4. Do not stand in direct line with the pulling rope.

— Courtesy of Greenlee, a Textron Co.