425 Amp Cable Size at 300 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 300 m (984.3 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 15.75V (2.28%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 19.49V (2.82%)
Voltage at Load674.2 VLine Loss: 11596.1 W
Max Power & Breaker507.92 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 300m
| 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 | 3150.6 V (456.61%) | 0.0 V | 5197.02 V (753.19%) | 2319225.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1890.36 V (273.97%) | 0.0 V | 3118.21 V (451.91%) | 1391535.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 1181.48 V (171.23%) | 0.0 V | 1948.88 V (282.45%) | 869709.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 787.65 V (114.15%) | 0.0 V | 1299.25 V (188.3%) | 579806.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 472.59 V (68.49%) | 217.4 V | 779.55 V (112.98%) | 347883.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 295.37 V (42.81%) | 394.6 V | 487.22 V (70.61%) | 217427.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 189.04 V (27.4%) | 501.0 V | 311.82 V (45.19%) | 139153.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 135.03 V (19.57%) | 555.0 V | 222.73 V (32.28%) | 99395.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 94.52 V (13.7%) | 595.5 V | 155.91 V (22.6%) | 69576.7 W | Drop High |
| 70 mm² | 192 A | 150 A | 67.51 V (9.78%) | 622.5 V | 111.36 V (16.14%) | 49697.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 49.75 V (7.21%) | 640.3 V | 82.06 V (11.89%) | 36619.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 39.38 V (5.71%) | 650.6 V | 64.96 V (9.41%) | 28990.3 W | Drop High |
| 150 mm² | 309 A | 241 A | 31.51 V (4.57%) | 658.5 V | 51.97 V (7.53%) | 23192.2 W | Drop High |
| 185 mm² | 353 A | 275 A | 25.55 V (3.7%) | 664.5 V | 42.14 V (6.11%) | 18804.5 W | Drop High |
| 240 mm² | 415 A | 324 A | 19.69 V (2.85%) | 670.3 V | 32.48 V (4.71%) | 14495.2 W | Drop High |
| 300 mm² | 477 A | 372 A | 15.75 V (2.28%) | 674.2 V | 25.99 V (3.77%) | 11596.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 11.81 V (1.71%) | 678.2 V | 19.49 V (2.82%) | 8697.1 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 300 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 425A at 300 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 300m at 690V (voltage drop: 15.75V or 2.28%).
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 · 300m (690V)16A · 300m (690V)20A · 300m (690V)25A · 300m (690V)32A · 300m (690V)40A · 300m (690V)50A · 300m (690V)63A · 300m (690V)80A · 300m (690V)100A · 300m (690V)125A · 300m (690V)160A · 300m (690V)200A · 300m (690V)