750 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 750 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 8.69V (1.26%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 28.66V (4.15%)
Voltage at Load681.3 VLine Loss: 11285.1 W
Max Power & Breaker896.34 kW800A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 750A 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 | 4633.24 V (671.48%) | 0.0 V | 7642.67 V (1107.63%) | 6018750.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 2779.94 V (402.89%) | 0.0 V | 4585.6 V (664.58%) | 3611250.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 1737.46 V (251.81%) | 0.0 V | 2866.0 V (415.36%) | 2257031.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 1158.31 V (167.87%) | 0.0 V | 1910.67 V (276.91%) | 1504687.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 694.99 V (100.72%) | 0.0 V | 1146.4 V (166.15%) | 902812.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 434.37 V (62.95%) | 255.6 V | 716.5 V (103.84%) | 564257.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 277.99 V (40.29%) | 412.0 V | 458.56 V (66.46%) | 361125.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 198.57 V (28.78%) | 491.4 V | 327.54 V (47.47%) | 257946.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 139.0 V (20.14%) | 551.0 V | 229.28 V (33.23%) | 180562.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 99.28 V (14.39%) | 590.7 V | 163.77 V (23.74%) | 128973.2 W | Drop High |
| 95 mm² | 232 A | 181 A | 73.16 V (10.6%) | 616.8 V | 120.67 V (17.49%) | 95032.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 57.92 V (8.39%) | 632.1 V | 95.53 V (13.85%) | 75234.4 W | Drop High |
| 150 mm² | 309 A | 241 A | 46.33 V (6.71%) | 643.7 V | 76.43 V (11.08%) | 60187.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 37.57 V (5.44%) | 652.4 V | 61.97 V (8.98%) | 48800.7 W | Drop High |
| 240 mm² | 415 A | 324 A | 28.96 V (4.2%) | 661.0 V | 47.77 V (6.92%) | 37617.2 W | Drop High |
| 300 mm² | 477 A | 372 A | 23.17 V (3.36%) | 666.8 V | 38.21 V (5.54%) | 30093.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 17.37 V (2.52%) | 672.6 V | 28.66 V (4.15%) | 22570.3 W | Drop High |
FAQ — 750 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 750A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 750A over 250m at 690V (voltage drop: 8.69V or 1.26%).
What is the power capacity of 750A at 690V?
At unity power factor, 750A at 690V supports 896.34 kW with a standard 800A circuit breaker.
Related Lengths & Currents (690V)
750A · 5m (690V)750A · 10m (690V)750A · 15m (690V)750A · 20m (690V)750A · 25m (690V)750A · 30m (690V)750A · 35m (690V)750A · 40m (690V)750A · 45m (690V)750A · 50m (690V)750A · 60m (690V)750A · 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)