750 Amp Cable Size at 20 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 20 m (65.6 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.69V (0.1%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.29V (0.33%)
Voltage at Load689.3 VLine Loss: 902.8 W
Max Power & Breaker896.34 kW800A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 750A at 20m
| 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 | 370.66 V (53.72%) | 319.3 V | 611.41 V (88.61%) | 481500.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 222.4 V (32.23%) | 467.6 V | 366.85 V (53.17%) | 288900.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 139.0 V (20.14%) | 551.0 V | 229.28 V (33.23%) | 180562.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 92.66 V (13.43%) | 597.3 V | 152.85 V (22.15%) | 120375.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 55.6 V (8.06%) | 634.4 V | 91.71 V (13.29%) | 72225.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 34.75 V (5.04%) | 655.3 V | 57.32 V (8.31%) | 45140.6 W | Drop High |
| 25 mm² | 101 A | 78 A | 22.24 V (3.22%) | 667.8 V | 36.68 V (5.32%) | 28890.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 15.89 V (2.3%) | 674.1 V | 26.2 V (3.8%) | 20635.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 14445.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 7.94 V (1.15%) | 682.1 V | 13.1 V (1.9%) | 10317.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 5.85 V (0.85%) | 684.1 V | 9.65 V (1.4%) | 7602.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.63 V (0.67%) | 685.4 V | 7.64 V (1.11%) | 6018.8 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.71 V (0.54%) | 686.3 V | 6.11 V (0.89%) | 4815.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.01 V (0.44%) | 687.0 V | 4.96 V (0.72%) | 3904.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.32 V (0.34%) | 687.7 V | 3.82 V (0.55%) | 3009.4 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.85 V (0.27%) | 688.1 V | 3.06 V (0.44%) | 2407.5 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.39 V (0.2%) | 688.6 V | 2.29 V (0.33%) | 1805.6 W | Drop High |
FAQ — 750 Amp Cable Size at 20 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 750A at 20 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 20m at 690V (voltage drop: 0.69V or 0.1%).
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 · 25m (690V)750A · 30m (690V)750A · 35m (690V)750A · 40m (690V)750A · 45m (690V)750A · 50m (690V)750A · 60m (690V)750A · 70m (690V)10A · 20m (690V)16A · 20m (690V)20A · 20m (690V)25A · 20m (690V)32A · 20m (690V)40A · 20m (690V)50A · 20m (690V)63A · 20m (690V)80A · 20m (690V)100A · 20m (690V)125A · 20m (690V)160A · 20m (690V)200A · 20m (690V)