Cable Sizing Calculations
Example: 230V, 20A, 100m: mm² ≈ (2×100×20)/(230×0.03) ≈ 58 mm² → use 70 mm².
Finally, cable sizing is an exercise in economic optimization. A larger conductor has lower resistance, which translates to lower power losses ($I^2R$ losses) over the lifetime of the installation. However, larger cables are more expensive to purchase and install. cable sizing calculations
Common derating factors:
