The area of that cross section is the well known A = pi*R² which is colloquially pronounced as “pie are squared.” We will put aside the old joke that “Pie are not squared; pie are round” but we have ...

Step 2: Calculate the total cross-sectional area of all conductors. 2.1219 + 0.3970 + 0.0973 = 2.6162 sq in. Step 3: Size the conduit at 40% fill [Chapter 9, Table 1] using Table 4. A 3-inch Schedule ...

Total cross-sectional area of existing conductors = 0.0748 sq in. Note: Ground wires must be counted for raceway fill. Step 3: Subtract the area of the existing conductors from the permitted area of ...