Okonite Cable Pulling Tension Calculator

Okonite Cable Pulling Tension Equation:

\[ T_{out} = T_{in} \times e^{\mu \times \theta} \]

Output Tension (T_out):

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1. What is the Okonite Cable Pulling Tension Equation?

The Okonite Cable Pulling Tension 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.

2. How Does the Calculator Work?

The calculator uses the Okonite equation:

\[ T_{out} = T_{in} \times e^{\mu \times \theta} \]

Where:

\( T_{out} \) — Output tension (lb or N)
\( T_{in} \) — Input tension (lb or N)
\( \mu \) — Coefficient of friction (dimensionless)
\( \theta \) — Angle of bend (radians)
\( e \) — Euler's number (~2.71828)

Explanation: The equation demonstrates how tension increases exponentially with friction and bend angle, which is critical for proper cable installation planning.

3. Importance of Cable Pulling Tension Calculation

Details: Accurate tension calculation is essential for preventing cable damage, ensuring proper installation, and maintaining cable integrity. Excessive tension can cause insulation damage, conductor stretching, or complete cable failure.

4. Using the Calculator

Tips: Enter input tension in lb or N, coefficient of friction (typically 0.15-0.5 for most cable types), and bend angle in radians. All values must be non-negative.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for coefficient of friction?
A: For most cable installations, μ ranges from 0.15 to 0.5, depending on cable jacket material and conduit type.

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 recommended pulling tension?
A: Maximum tension varies by cable type but generally should not exceed 0.008 lb/circular mil for copper or 0.006 lb/circular mil for aluminum.

Q4: When should I use this calculation?
A: Use for planning cable pulls through conduits with bends, around sheaves, or through cable trays with directional changes.

Q5: Are there limitations to this equation?
A: The equation assumes constant friction coefficient and doesn't account for additional factors like cable weight, multiple bends, or sidewall pressure limitations.