425 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy 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)300 mm²Drop: 13.13V (1.9%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 16.24V (2.35%)
Voltage at Load676.9 VLine Loss: 9663.4 W
Max Power & Breaker507.92 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 (380.51%) | 0.0 V | 4330.85 V (627.66%) | 1932687.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1575.3 V (228.3%) | 0.0 V | 2598.51 V (376.6%) | 1159612.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 984.56 V (142.69%) | 0.0 V | 1624.07 V (235.37%) | 724757.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 656.38 V (95.13%) | 33.6 V | 1082.71 V (156.91%) | 483171.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 393.83 V (57.08%) | 296.2 V | 649.63 V (94.15%) | 289903.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 246.14 V (35.67%) | 443.9 V | 406.02 V (58.84%) | 181189.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 157.53 V (22.83%) | 532.5 V | 259.85 V (37.66%) | 115961.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 112.52 V (16.31%) | 577.5 V | 185.61 V (26.9%) | 82829.5 W | Drop High |
| 50 mm² | 151 A | 118 A | 78.77 V (11.42%) | 611.2 V | 129.93 V (18.83%) | 57980.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 56.26 V (8.15%) | 633.7 V | 92.8 V (13.45%) | 41414.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 41.46 V (6.01%) | 648.5 V | 68.38 V (9.91%) | 30516.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 32.82 V (4.76%) | 657.2 V | 54.14 V (7.85%) | 24158.6 W | Drop High |
| 150 mm² | 309 A | 241 A | 26.26 V (3.81%) | 663.7 V | 43.31 V (6.28%) | 19326.9 W | Drop High |
| 185 mm² | 353 A | 275 A | 21.29 V (3.09%) | 668.7 V | 35.11 V (5.09%) | 15670.4 W | Drop High |
| 240 mm² | 415 A | 324 A | 16.41 V (2.38%) | 673.6 V | 27.07 V (3.92%) | 12079.3 W | Drop High |
| 300 mm² | 477 A | 372 A | 13.13 V (1.9%) | 676.9 V | 21.65 V (3.14%) | 9663.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 9.85 V (1.43%) | 680.2 V | 16.24 V (2.35%) | 7247.6 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 425A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 425A over 250m at 690V (voltage drop: 13.13V or 1.9%).
What is the power capacity of 425A at 690V?
At unity power factor, 425A at 690V supports 507.92 kW with a standard 450A circuit breaker.
Related Lengths & Currents (690V)
425A · 5m (690V)425A · 10m (690V)425A · 15m (690V)425A · 20m (690V)425A · 25m (690V)425A · 30m (690V)425A · 35m (690V)425A · 40m (690V)425A · 45m (690V)425A · 50m (690V)425A · 60m (690V)425A · 70m (690V)10A · 250m (690V)16A · 250m (690V)20A · 250m (690V)25A · 250m (690V)32A · 250m (690V)40A · 250m (690V)50A · 250m (690V)63A · 250m (690V)80A · 250m (690V)100A · 250m (690V)125A · 250m (690V)160A · 250m (690V)200A · 250m (690V)