Answer from Ningbo Changshi: Choosing the correct pulling capacity is critical for both safety and equipment longevity. A common mistake is to select a winch with a capacity equal to the cable's weight. The correct approach is to consider all factors that contribute to the total pulling force.

You should select a winch with a rated line pull capacity that is at least 1.5 times the calculated total pulling force of your specific project. This safety margin accounts for:

• Friction: The coefficient of friction between the cable and the conduit/sheaves.

• Bends and Slopes: Each turn or incline exponentially increases the pulling tension.

• Length of the Pull: Longer pulls build up more cumulative tension.

• Number of Layers on the Drum: Winches lose pulling power with each successive layer of rope wrapped around the drum.

We recommend using a tension calculation tool to accurately determine the required pulling force for your specific job. Our sales engineers are also available to assist with these calculations to ensure you choose the safest and most efficient winch for your needs.