900 Amp Cable Size at 70 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 900 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 2.92V (0.42%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 9.63V (1.4%)
Voltage at Load687.1 VLine Loss: 4550.2 W
Max Power & Breaker1075.6 kW1000A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 900A at 70m
| 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 | 1556.77 V (225.62%) | 0.0 V | 2567.94 V (372.17%) | 2426760.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 934.06 V (135.37%) | 0.0 V | 1540.76 V (223.3%) | 1456056.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 583.79 V (84.61%) | 106.2 V | 962.98 V (139.56%) | 910035.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 389.19 V (56.4%) | 300.8 V | 641.98 V (93.04%) | 606690.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 233.52 V (33.84%) | 456.5 V | 385.19 V (55.82%) | 364014.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 145.95 V (21.15%) | 544.1 V | 240.74 V (34.89%) | 227508.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 93.41 V (13.54%) | 596.6 V | 154.08 V (22.33%) | 145605.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 66.72 V (9.67%) | 623.3 V | 110.05 V (15.95%) | 104004.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 46.7 V (6.77%) | 643.3 V | 77.04 V (11.16%) | 72802.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 33.36 V (4.83%) | 656.6 V | 55.03 V (7.97%) | 52002.0 W | Drop High |
| 95 mm² | 232 A | 181 A | 24.58 V (3.56%) | 665.4 V | 40.55 V (5.88%) | 38317.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 19.46 V (2.82%) | 670.5 V | 32.1 V (4.65%) | 30334.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 15.57 V (2.26%) | 674.4 V | 25.68 V (3.72%) | 24267.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 12.62 V (1.83%) | 677.4 V | 20.82 V (3.02%) | 19676.4 W | Drop High |
| 240 mm² | 415 A | 324 A | 9.73 V (1.41%) | 680.3 V | 16.05 V (2.33%) | 15167.3 W | Drop High |
| 300 mm² | 477 A | 372 A | 7.78 V (1.13%) | 682.2 V | 12.84 V (1.86%) | 12133.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 5.84 V (0.85%) | 684.2 V | 9.63 V (1.4%) | 9100.4 W | Drop High |
FAQ — 900 Amp Cable Size at 70 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 900A at 70 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 900A over 70m at 690V (voltage drop: 2.92V or 0.42%).
What is the power capacity of 900A at 690V?
At unity power factor, 900A at 690V supports 1075.6 kW with a standard 1000A circuit breaker.
Related Lengths & Currents (690V)
900A · 5m (690V)900A · 10m (690V)900A · 15m (690V)900A · 20m (690V)900A · 25m (690V)900A · 30m (690V)900A · 35m (690V)900A · 40m (690V)900A · 45m (690V)900A · 50m (690V)900A · 60m (690V)10A · 70m (690V)16A · 70m (690V)20A · 70m (690V)25A · 70m (690V)32A · 70m (690V)40A · 70m (690V)50A · 70m (690V)63A · 70m (690V)80A · 70m (690V)100A · 70m (690V)125A · 70m (690V)160A · 70m (690V)200A · 70m (690V)