Selecting the correct cable size is critical for safety and performance. It is primarily based on two factors: the short-circuit current and the normal load current carrying capacity. The cable's cross-sectional area must be large enough to withstand the thermal stress of a short-circuit fault for a specified duration (e.g., 1 second). It must also be able to carry the continuous load current without exceeding its maximum operating temperature. We use formulas from standards like IEC 60287 and consider factors such as the conductor material (aluminum or copper) and the insulation material (XLPE).