Using standard cable ampacity tables (such as IEC 60364-5-52 or NEC Table 310.16), find a cable size whose base current rating ($I_z$) is greater than the value calculated in Step 2.
Temp 35°C: factor 0.96 (XLPE) Grouping 4 circuits: factor 0.80 Required ampacity = 51 / (0.96 × 0.80) = 66.4 A electrical cable size calculation
10 mm² → 72 A → meets 66.4 A requirement. Using standard cable ampacity tables (such as IEC
| Application | Min copper size | |-------------|----------------| | Branch circuit power | 14 AWG (2.08 mm²) | | Control circuits | 18 AWG (0.823 mm²) | | Earthing conductor | Per NEC Table 250.122 | electrical cable size calculation