1. What is Conduit Shrink?

Conduit shrink refers to the reduction in length that occurs when bending conduit at an angle. It's a crucial calculation in electrical conduit bending to ensure accurate measurements and proper installation of electrical systems.

2. How Does the Calculator Work?

The calculator uses the conduit shrink formula:

Where:

• \( Depth \) — Depth of bend (inches)
• \( Factor \) — Shrinkage factor (dimensionless number)

Explanation: The formula calculates how much the conduit will shorten when bent at a specific angle with a given depth.

3. Importance of Shrink Calculation

Details: Accurate shrink calculation is essential for proper conduit bending, ensuring that electrical runs fit correctly and maintain proper alignment. Incorrect calculations can lead to misaligned conduits, wasted materials, and installation delays.

4. Using the Calculator

Tips: Enter depth in inches and the appropriate factor for your bend angle. Both values must be positive numbers. Common factors vary based on bend angle (30°, 45°, 60°, etc.).

5. Frequently Asked Questions (FAQ)

Q1: What are typical factor values for different angles?
A: Common factors include 0.25 for 30°, 0.5 for 45°, and 0.75 for 60° bends, but always consult specific bending guidelines.

Q2: Why does conduit shrink when bent?
A: The outer surface of the bend stretches while the inner surface compresses, causing an overall reduction in length along the centerline.

Q3: How accurate are shrink calculations?
A: Calculations provide good estimates, but actual results may vary based on conduit material, bending method, and operator technique.

Q4: Can this calculator be used for all conduit types?
A: The formula works for EMT, PVC, and other common conduit types, though specific factors may vary slightly.

Q5: Should I add safety margin to calculated shrink?
A: Experienced electricians often add a small safety margin (1-2%) to account for variations in bending equipment and technique.