1. What is the Simpull Cable Pull Equation?

The Simpull equation calculates the output tension when pulling cable through conduit with bends. It's based on the capstan equation and accounts for friction and bend angles to determine the force required to pull cable through conduit systems.

2. How Does the Calculator Work?

The calculator uses the Simpull equation:

Where:

• \( T_{in} \) — Input tension (lb or N)
• \( \mu \) — Friction coefficient (dimensionless)
• \( \theta \) — Bend angle (radians)
• \( e \) — Euler's number (~2.71828)

Explanation: The equation shows how tension increases exponentially with friction and bend angle when pulling cable through conduit.

3. Importance of Cable Pull Tension Calculation

Details: Accurate tension calculation is crucial for preventing cable damage during installation, ensuring proper cable performance, and maintaining safety standards in electrical installations.

4. Using the Calculator

Tips: Enter input tension in lb or N, friction coefficient (typically 0.1-0.5 for cable in conduit), and bend angle in radians. All values must be valid (tension > 0, μ ≥ 0, θ ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: What are typical friction coefficients for cable pulling?
A: Friction coefficients typically range from 0.1 to 0.5, depending on cable type, conduit material, and lubricant use.

Q2: How do I convert degrees to radians?
A: Multiply degrees by π/180. For example, 90° = 90 × π/180 = π/2 ≈ 1.57 radians.

Q3: What is the maximum recommended pulling tension?
A: Maximum tension varies by cable type but is typically 0.008 lb per circular mil of conductor cross-section for copper cable.

Q4: Does this equation account for multiple bends?
A: For multiple bends, calculate tension sequentially through each bend, using the output tension from one bend as input to the next.

Q5: When should I use cable pulling lubricant?
A: Lubricant should be used when calculated tensions approach cable limits, for long pulls, or when multiple bends are present.