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Cable Pulling Tension Equation:
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The cable pulling tension equation calculates the output tension (T_out) based on input tension (T_in), coefficient of friction (μ), and the angle of bend (θ). This formula is essential for determining the force required to pull cables through conduits or around bends without damaging the cable.
The calculator uses the cable pulling tension equation:
Where:
Explanation: The equation demonstrates how tension increases exponentially as a cable is pulled around a bend, with the increase depending on both the coefficient of friction and the angle of the bend.
Details: Proper tension calculation is crucial for preventing cable damage during installation, ensuring worker safety, and complying with industry standards for maximum pulling tensions.
Tips: Enter input tension in lb or N, coefficient of friction (typically 0.1-0.5 for most cable/conduit combinations), and angle in radians. All values must be non-negative.
Q1: What are typical values for coefficient of friction?
A: For most cable/conduit combinations, μ ranges from 0.1 to 0.5. Lubricated pulls typically have lower coefficients (0.1-0.3).
Q2: How do I convert degrees to radians?
A: Multiply degrees by π/180. For example, 90° = 90 × π/180 = π/2 radians ≈ 1.57 radians.
Q3: What is the maximum safe pulling tension?
A: Maximum tension varies by cable type and size. Consult manufacturer specifications, but generally should not exceed 0.008 × n × CMA (lb) where n is number of cables and CMA is circular mil area.
Q4: How does bending radius affect tension?
A: Smaller bend radii increase tension more dramatically. Always maintain minimum bend radii specified by cable manufacturers.
Q5: When should I use cable lubricant?
A: Cable lubricant should be used when calculated tensions approach maximum allowable values, or for pulls with multiple bends or long distances.