How To Calculate Conduit Size

$$Conduit Diameter = \sqrt\frac4 \times 785\pi = 31.6 mm$$

To determine the minimum trade size diameter of conduit required to safely house insulated conductors without damaging the wire insulation or exceeding legal fill ratios. how to calculate conduit size

Now, refer to , which lists the internal dimensions of various conduit types (EMT, PVC, IMC, etc.). Find the column for "40% Fill." $$Conduit Diameter = \sqrt\frac4 \times 785\pi = 31

Look up your wire type and gauge to find the "Approximate Area" in square inches (in²). Example: A #12 THHN wire has an area of 0.0133 in². Step B: Calculate Total Wire Area Example: A #12 THHN wire has an area of 0

| Conduit Trade Size (in) | Internal Area (40% Fill) – EMT (sq in) | | :--- | :--- | | 1/2" | 0.122 | | 3/4" | 0.213 | | 1" | 0.346 | | 1-1/4" | 0.598 | | 1-1/2" | 0.814 |

To calculate conduit size, follow these steps: