425 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 425 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)400 mm²Drop: 9.85V (2.37%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 16.24V (3.91%)
Voltage at Load405.2 VLine Loss: 7247.6 W
Max Power & Breaker305.49 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 250m
| Cross-Section (mm²) | Cu Ampacity | Al Ampacity | Cu Voltage Drop | Load Voltage | Al Voltage Drop | Power Loss | Status |
|---|---|---|---|---|---|---|---|
| 1.5 mm² | 16 A | 12 A | 2625.5 V (632.65%) | 0.0 V | 4330.85 V (1043.58%) | 1932687.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1575.3 V (379.59%) | 0.0 V | 2598.51 V (626.15%) | 1159612.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 984.56 V (237.24%) | 0.0 V | 1624.07 V (391.34%) | 724757.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 656.38 V (158.16%) | 0.0 V | 1082.71 V (260.89%) | 483171.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 393.83 V (94.9%) | 21.2 V | 649.63 V (156.54%) | 289903.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 246.14 V (59.31%) | 168.9 V | 406.02 V (97.84%) | 181189.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 157.53 V (37.96%) | 257.5 V | 259.85 V (62.61%) | 115961.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 112.52 V (27.11%) | 302.5 V | 185.61 V (44.72%) | 82829.5 W | Drop High |
| 50 mm² | 151 A | 118 A | 78.77 V (18.98%) | 336.2 V | 129.93 V (31.31%) | 57980.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 56.26 V (13.56%) | 358.7 V | 92.8 V (22.36%) | 41414.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 41.46 V (9.99%) | 373.5 V | 68.38 V (16.48%) | 30516.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 32.82 V (7.91%) | 382.2 V | 54.14 V (13.04%) | 24158.6 W | Drop High |
| 150 mm² | 309 A | 241 A | 26.26 V (6.33%) | 388.7 V | 43.31 V (10.44%) | 19326.9 W | Drop High |
| 185 mm² | 353 A | 275 A | 21.29 V (5.13%) | 393.7 V | 35.11 V (8.46%) | 15670.4 W | Drop High |
| 240 mm² | 415 A | 324 A | 16.41 V (3.95%) | 398.6 V | 27.07 V (6.52%) | 12079.3 W | Drop High |
| 300 mm² | 477 A | 372 A | 13.13 V (3.16%) | 401.9 V | 21.65 V (5.22%) | 9663.4 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 9.85 V (2.37%) | 405.2 V | 16.24 V (3.91%) | 7247.6 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 425A at 250 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 400 mm² copper cable for 425A over 250m at 415V (voltage drop: 9.85V or 2.37%).
What is the power capacity of 425A at 415V?
At unity power factor, 425A at 415V supports 305.49 kW with a standard 450A circuit breaker.
Related Lengths & Currents (415V)
425A · 5m (415V)425A · 10m (415V)425A · 15m (415V)425A · 20m (415V)425A · 25m (415V)425A · 30m (415V)425A · 35m (415V)425A · 40m (415V)425A · 45m (415V)425A · 50m (415V)425A · 60m (415V)425A · 70m (415V)10A · 250m (415V)16A · 250m (415V)20A · 250m (415V)25A · 250m (415V)32A · 250m (415V)40A · 250m (415V)50A · 250m (415V)63A · 250m (415V)80A · 250m (415V)100A · 250m (415V)125A · 250m (415V)160A · 250m (415V)200A · 250m (415V)