A bending conduit calculator is an invaluable tool designed to simplify the process of bending conduits, which are tubes used to protect and route electrical wiring in a building. The calculator helps determine the exact measurements needed to achieve the desired bend, ensuring that the conduit fits perfectly in the intended space. This tool is essential for avoiding waste of materials and time caused by inaccurate bends.
Formula of Bending Conduit Calculator
90-Degree Bend Formula
The formula for calculating a 90-degree bend is straightforward:
L = A - T
- L = Length of conduit to cut before the bend
- A = Distance from the end of the conduit to the back of the 90-degree bend
- T = Take-up length of the bender, which varies depending on the size and type of conduit bender
Offset Bend Formula
For offset bends, the formula is slightly more complex but just as essential:
L = O / sin(θ)
- L = Actual length of conduit to bend
- O = Offset distance needed
- θ = Angle of the bend in degrees
- sin(θ) = Sine of the bend angle, a trigonometric function
General Terms and Handy Conversion Table
To assist further, we’ve compiled a table of general terms and conversions commonly used in conduit bending. This reference aims to save time and reduce the need for calculations, making your work more efficient.
| Term | Definition |
|---|---|
| Bend Deduction | The amount of material needed to perform a bend. |
| Take-Up | The length of conduit that is actually bent in the process. |
| Stub-Up | The length of conduit that extends from the bend to the end of the conduit. |
Conversion Table
| Bend Angle (θ) | Sine of Angle (sin(θ)) |
|---|---|
| 30° | 0.5 |
| 45° | 0.7071 |
| 60° | 0.8660 |
| 90° | 1 |
This table provides a quick reference to avoid manual calculations for the most common angles.
Example of Bending Conduit Calculator
Let’s apply the formulas to real-life scenarios to illustrate how to use the bending conduit calculator effectively:
90-Degree Bend Example
If you need to make a 90-degree bend with a 1/2 inch EMT conduit and the back of the bend is to start 24 inches from the end of the conduit, with a take-up length of 6 inches, the calculation would be:
L = 24 - 6 = 18 inches
This means you would need to cut 18 inches of conduit before making the bend.
Offset Bend Example
For an offset bend needing to move the conduit up 4 inches with a 45-degree bend angle, the calculation would be:
L = 4 / sin(45°) = 4 / 0.7071 ≈ 5.66 inches
This calculation tells you the actual length of conduit to bend to achieve a 4-inch offset with a 45-degree bend angle.
Most Common FAQs
You can use the formulas and tables provided in this guide as a manual alternative to a bending conduit calculator. These resources offer a reliable way to calculate bends accurately.
Yes, these formulas apply to various types of conduits, including EMT, PVC, and Rigid conduits. However, the take-up length (T) may vary depending on the conduit type and bender used, so always refer to your bender’s specifications.
Use the sine of the bend angle in the offset bend formula to calculate different bend angles. For common angles, refer to the conversion table provided to streamline the process.