Answer from Ningbo Changshi: Calculating cable pulling tension is a critical planning step that prevents over-stressing and damaging a cable. The final tension is not a single number but a culmination of several variables that add up throughout the pull. The fundamental calculation for a straight section is based on the cable's weight, the length of the run, and the coefficient of friction.

However, the key factors that influence tension are more complex:

• Friction and Bends: This is the single biggest factor. Each bend in the route, whether horizontal or vertical, acts as a multiplier, exponentially increasing the tension on the cable as it goes around the bend.

• Cable and Conduit Type: The material of the cable jacket and the inner surface of the conduit or duct directly determine the coefficient of friction. Different materials, like PVC, HDPE, or steel, have varying friction values.

• Lubrication: Using a high-quality, compatible lubricant can dramatically reduce the coefficient of friction, thereby lowering the total pulling tension required.

• Route Profile: Inclines (uphill sections) increase tension as the winch must pull against gravity, while declines (downhill sections) can reduce it.

• Sidewall Pressure: As a cable goes around a bend, it presses against the side of the conduit. This sidewall pressure is a critical factor that can cause cable damage even if the pulling tension is within limits.

We provide comprehensive data on our equipment and can assist with tension calculations to ensure your project is planned and executed safely.