425 Amp Cable Size at 25 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 25 m (82.0 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 1.31V (0.19%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.62V (0.24%)
Voltage at Load688.7 VLine Loss: 966.3 W
Max Power & Breaker507.92 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 25m
| 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 | 262.55 V (38.05%) | 427.4 V | 433.08 V (62.77%) | 193268.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 157.53 V (22.83%) | 532.5 V | 259.85 V (37.66%) | 115961.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 98.46 V (14.27%) | 591.5 V | 162.41 V (23.54%) | 72475.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 65.64 V (9.51%) | 624.4 V | 108.27 V (15.69%) | 48317.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 39.38 V (5.71%) | 650.6 V | 64.96 V (9.41%) | 28990.3 W | Drop High |
| 16 mm² | 76 A | 59 A | 24.61 V (3.57%) | 665.4 V | 40.6 V (5.88%) | 18118.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 15.75 V (2.28%) | 674.2 V | 25.99 V (3.77%) | 11596.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 11.25 V (1.63%) | 678.7 V | 18.56 V (2.69%) | 8282.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 7.88 V (1.14%) | 682.1 V | 12.99 V (1.88%) | 5798.1 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.63 V (0.82%) | 684.4 V | 9.28 V (1.34%) | 4141.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 4.15 V (0.6%) | 685.9 V | 6.84 V (0.99%) | 3051.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.28 V (0.48%) | 686.7 V | 5.41 V (0.78%) | 2415.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.63 V (0.38%) | 687.4 V | 4.33 V (0.63%) | 1932.7 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.13 V (0.31%) | 687.9 V | 3.51 V (0.51%) | 1567.0 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.64 V (0.24%) | 688.4 V | 2.71 V (0.39%) | 1207.9 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.31 V (0.19%) | 688.7 V | 2.17 V (0.31%) | 966.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.98 V (0.14%) | 689.0 V | 1.62 V (0.24%) | 724.8 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 25 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 425A at 25 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 25m at 690V (voltage drop: 1.31V or 0.19%).
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 · 30m (690V)425A · 35m (690V)425A · 40m (690V)425A · 45m (690V)425A · 50m (690V)425A · 60m (690V)425A · 70m (690V)10A · 25m (690V)16A · 25m (690V)20A · 25m (690V)25A · 25m (690V)32A · 25m (690V)40A · 25m (690V)50A · 25m (690V)63A · 25m (690V)80A · 25m (690V)100A · 25m (690V)125A · 25m (690V)160A · 25m (690V)200A · 25m (690V)