Verify the cable can survive the heat generated during a short circuit until the protection clears the fault. : Required cross-sectional area ( m m squared cap I sub s c end-sub : Short-circuit current (Amps) : Fault duration (seconds, e.g., 1.0s or 3.0s)
For MV cables, the inductive reactance dominates. The accurate formula in Excel: mv cable sizing calculation excel
| Temp (°C) | XLPE | EPR | PVC | | :--- | :--- | :--- | :--- | | 20 | 1.12 | 1.11 | 1.15 | | 25 | 1.07 | 1.07 | 1.11 | | 30 | 1.00 | 1.00 | 1.00 | | 35 | 0.93 | 0.94 | 0.89 | | 40 | 0.85 | 0.87 | 0.77 | Verify the cable can survive the heat generated
Where: