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Okonite Equation:
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The Okonite pulling calculation method estimates the output tension required when pulling cables or wires through conduits, taking into account friction and bend angles. It provides an accurate assessment of the tension forces involved in cable installation.
The calculator uses the Okonite equation:
Where:
Explanation: The equation accounts for the exponential increase in tension due to friction over the bend angle, which is crucial for proper cable installation planning.
Details: Accurate tension calculation is crucial for determining the maximum allowable pulling tension, preventing cable damage, ensuring proper installation, and selecting appropriate pulling equipment.
Tips: Enter input tension in lb or N, coefficient of friction (dimensionless), and angle in radians. All values must be valid (tension > 0, μ ≥ 0, θ ≥ 0).
Q1: What is the typical range for coefficient of friction in cable pulling?
A: The coefficient of friction typically ranges from 0.15 to 0.5, depending on the cable jacket material and conduit surface.
Q2: How do I convert degrees to radians?
A: Multiply degrees by π/180 (approximately 0.0174533) to convert to radians.
Q3: What are safe pulling tension limits?
A: Safe pulling tension depends on cable type and size. Generally, it should not exceed 0.008 times the cross-sectional area of the conductor in lb-force.
Q4: When should I use this calculation?
A: Use this calculation when planning cable installations through conduits with bends, to ensure you don't exceed maximum allowable pulling tensions.
Q5: Are there limitations to this equation?
A: This equation assumes constant friction coefficient and doesn't account for additional factors like sidewall pressure, weight of the cable, or multiple bends.