What is the fundamental formula for calculating pulling tension in a straight section of conduit?

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What is the fundamental formula for calculating pulling tension in a straight section of conduit?

2025-08-16

Answer from Ningbo Changshi: The most basic pulling tension formula applies to a straight, horizontal section of conduit and establishes the foundation for all further calculations. The formula accounts for the initial tension at the start of the section and the added friction along its length.

The formula is as follows:

$T_{o u t} = T_{in} + L \times w \times μ$

Where:

$T_{o u t}$ is the tension at the end of the straight section.
$T_{in}$ is the tension coming into the straight section (from the cable reel or a previous section).
$L$ is the length of the straight run.
$w$ is the weight of the cable per unit length.
$μ$ is the coefficient of friction between the cable jacket and the conduit wall.

The total tension is the sum of the tension from the previous section and the added tension from the current section. This formula highlights the critical role of the coefficient of friction, which can be significantly reduced by using high-performance lubricants. We offer a range of equipment designed to minimize tension, starting with our efficient cable OHTLstringingequipment.com/Reel-Stands--Cable-Winders.html target='_blank'>Reel Stands and professional-grade lubricants.

What is the standard for maximum pulling tension, and how does it relate to the pulling method?How does the pulling tension formula change when the cable is pulled around a bend?

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