400 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 400 A over 300 m (984.3 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 18.53V (2.69%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 18.34V (2.66%)
Voltage at Load671.5 VLine Loss: 12840.0 W
Max Power & Breaker478.05 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A 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 | 2965.27 V (429.75%) | 0.0 V | 4891.31 V (708.89%) | 2054400.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1779.16 V (257.85%) | 0.0 V | 2934.79 V (425.33%) | 1232640.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 1111.98 V (161.16%) | 0.0 V | 1834.24 V (265.83%) | 770400.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 741.32 V (107.44%) | 0.0 V | 1222.83 V (177.22%) | 513600.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 444.79 V (64.46%) | 245.2 V | 733.7 V (106.33%) | 308160.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 277.99 V (40.29%) | 412.0 V | 458.56 V (66.46%) | 192600.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 177.92 V (25.78%) | 512.1 V | 293.48 V (42.53%) | 123264.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 127.08 V (18.42%) | 562.9 V | 209.63 V (30.38%) | 88045.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 88.96 V (12.89%) | 601.0 V | 146.74 V (21.27%) | 61632.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 63.54 V (9.21%) | 626.5 V | 104.81 V (15.19%) | 44022.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 46.82 V (6.79%) | 643.2 V | 77.23 V (11.19%) | 32437.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 37.07 V (5.37%) | 652.9 V | 61.14 V (8.86%) | 25680.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 29.65 V (4.3%) | 660.3 V | 48.91 V (7.09%) | 20544.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 24.04 V (3.48%) | 666.0 V | 39.66 V (5.75%) | 16657.3 W | Drop High |
| 240 mm² | 415 A | 324 A | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 12840.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 14.83 V (2.15%) | 675.2 V | 24.46 V (3.54%) | 10272.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 7704.0 W | ✓ OK (≤3%) |
FAQ — 400 Amp Cable Size at 300 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 400A at 300 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 400A over 300m at 690V (voltage drop: 18.53V or 2.69%).
What is the power capacity of 400A at 690V?
At unity power factor, 400A at 690V supports 478.05 kW with a standard 400A circuit breaker.
Related Lengths & Currents (690V)
400A · 5m (690V)400A · 10m (690V)400A · 15m (690V)400A · 20m (690V)400A · 25m (690V)400A · 30m (690V)400A · 35m (690V)400A · 40m (690V)400A · 45m (690V)400A · 50m (690V)400A · 60m (690V)400A · 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)