13
Nov
Cable Pulling – A Team Effort
To continue from the previous posting, here’s some more suggestions for cable pulling. We’ve already reviewed cable tension and how to manage that. This time, I’ll cover the remainder of the hardware that can be applied to a successful pull. Starting at the beginning and progressing through the length of the pull:
– Duct Rodders are available in a range of sizes to suit the job, and are the simplest way to push or pull the initial messenger lines through the ducts.
– Duct-Checkers can be then pulled to ensure the bore is clear, and synthetic pull tape or line can be pulled through with the trailing eye.
– Attaching a pulling eye to the cable can be done with Pulling Grips or with DCD’s Power-Grip Pulling Eyes. Pulling Grips are very common, but you must make allowance for Safety Factors between the pulling force and the breaking strength. DCD’s Power-Grips are re-useable end fittings that are stronger than the cable, and they limit damage to the cable to a very short end section.
– A Line Swivel should be linked between the pulling cable and the cable’s pulling eye to eliminate twist in the electrical cable. Eliminating this torque also contributes to reduced pulling force. Always choose a Line Swivel with excess capacity.
– At the cable reel end, a Duct Entry Guide provides a durable roller at the duct entry. DCD Guides are provided with a standard spray nozzle for connecting to a Lubricant Applicator to provide continuous cable lubrication.
– Exiting the duct at the pulling end, DCD Quadrants have large aluminum rollers to maximize corner radius and distribute point loads on the cable. Alternatively, the range of DCD Hanger Sheaves offers a range of sheave radii to suit the cable manufacturers’ design allowables.
– An Offset-Eye Pulling Grip can be laced onto the mid-span of the cable for short, repetitive pulls to draw extra cable at the pulling end.
– Finally, the Tuf-Lugger does the heavy lifting – as described before.
Individually, each offers some small advantage when pulling cable. And altogether, you’ve got a pretty good team!
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