
How do I calculate the right size and breaking strength of a draw rope for my specific cable pulling project?
2025-08-15Answer: The rope's size and breaking strength are critical to project safety and success. The general rule is to use a rope with a breaking strength significantly greater than the maximum anticipated pulling force. We recommend a safety factor of at least 4:1.
To determine the ideal rope for your project, consider the following factors:
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Cable Weight & Length: Heavier and longer cables require ropes with higher tensile strength.
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Number of Bends/Turns: Bends and turns in a conduit or along the line increase friction, requiring a rope with a higher working load limit.
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Maximum Pulling Force of Your Equipment: Always choose a rope with a breaking strength that exceeds your puller's maximum capacity, adhering to the 4:1 safety factor.
Our technical team at Ningbo Changshi can provide specific calculations and recommendations based on your project's unique requirements to ensure you select the safest and most efficient rope.