What Is Setback In Conduit Bending

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What is Setback in Conduit Bending?

Setback in conduit bending refers to the distance between the start of the conduit bend and the point where the conduit exits the bender’s shoe. It is a crucial factor that determines the accuracy and efficiency of conduit bending.

Importance of Setback

  • Precise Conduit Bends: Proper setback ensures that the conduit bend matches the desired radius and angle, preventing kinks or distortions.
  • Smooth Bending: Adequate setback allows for even distribution of tension on the conduit during bending, resulting in smooth and predictable bends.
  • Reduced Effort: Calculating and applying the correct setback reduces the force required to bend the conduit, making the bending process easier.
  • Code Compliance: Many electrical codes specify minimum setback values to ensure electrical safety and functionality.

How to Calculate Setback

The setback is typically measured from the inside radius of the bend to the end of the conduit that exits the bender’s shoe. To calculate the setback, use the following formula:

“`
Setback = 3.14 * Radius of Bend / 2
“`

For example, if you have a conduit with a radius of bend of 3 inches, the setback would be:

“`
Setback = 3.14 * 3 / 2 = 4.71 inches
“`

Applying Setback in Conduit Bending

To apply setback during conduit bending, follow these steps:

  1. Measure the radius of bond and calculate the setback using the formula above.
  2. Mark the setback distance on the conduit.
  3. Insert the conduit into the bender’s shoe and align the mark with the end of the shoe.
  4. Bend the conduit smoothly and evenly until the desired angle is achieved.

Conclusion

Setback is an essential parameter in conduit bending that plays a vital role in achieving accurate and efficient results. By understanding the importance of setback, calculating it correctly, and applying it during the bending process, electricians can ensure electrical safety, functionality, and aesthetic appeal in their wiring projects.

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