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Okonite Equation:
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The Okonite cable pulling equation calculates the output tension when pulling cable through conduits or around bends. It accounts for friction and bend angles to determine the required pulling force, helping prevent cable damage during installation.
The calculator uses the Okonite equation:
Where:
Explanation: The equation calculates how tension increases exponentially as cable is pulled around bends due to friction effects.
Details: Proper tension calculation is crucial for preventing cable damage, ensuring safe installation, and maintaining cable integrity. Excessive tension can cause insulation damage, conductor stretching, or complete cable failure.
Tips: Enter input tension in lb or N, coefficient of friction (typically 0.15-0.5 for cable pulling), and bend angle in radians. All values must be positive numbers.
Q1: What are typical friction coefficients for cable pulling?
A: Typical values range from 0.15 to 0.5, depending on conduit material, cable type, and lubricant used.
Q2: How do I convert degrees to radians?
A: Multiply degrees by π/180 (approximately 0.0174533). For example, 90° = 90 × π/180 = π/2 radians.
Q3: What is the maximum safe pulling tension?
A: Maximum tension depends on cable type and size. Consult manufacturer specifications, but typically ranges from 0.008 to 0.015 lb/circular mil of conductor area.
Q4: How does lubrication affect the calculation?
A: Proper lubrication reduces the coefficient of friction, significantly lowering the required pulling tension and reducing cable stress.
Q5: Can this equation be used for multiple bends?
A: Yes, for multiple bends, calculate sequentially: T_out from first bend becomes T_in for the next bend, and so on.