400 Amp Cable Size at 120 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 120 m (393.7 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 7.41V (1.07%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 7.34V (1.06%)
Voltage at Load682.6 VLine Loss: 5136.0 W
Max Power & Breaker478.05 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A at 120m
| 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 | 1186.11 V (171.9%) | 0.0 V | 1956.52 V (283.55%) | 821760.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 711.67 V (103.14%) | 0.0 V | 1173.91 V (170.13%) | 493056.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 444.79 V (64.46%) | 245.2 V | 733.7 V (106.33%) | 308160.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 296.53 V (42.97%) | 393.5 V | 489.13 V (70.89%) | 205440.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 177.92 V (25.78%) | 512.1 V | 293.48 V (42.53%) | 123264.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 111.2 V (16.12%) | 578.8 V | 183.42 V (26.58%) | 77040.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 71.17 V (10.31%) | 618.8 V | 117.39 V (17.01%) | 49305.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 50.83 V (7.37%) | 639.2 V | 83.85 V (12.15%) | 35218.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 35.58 V (5.16%) | 654.4 V | 58.7 V (8.51%) | 24652.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 25.42 V (3.68%) | 664.6 V | 41.93 V (6.08%) | 17609.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 18.73 V (2.71%) | 671.3 V | 30.89 V (4.48%) | 12975.2 W | Drop High |
| 120 mm² | 269 A | 210 A | 14.83 V (2.15%) | 675.2 V | 24.46 V (3.54%) | 10272.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 11.86 V (1.72%) | 678.1 V | 19.57 V (2.84%) | 8217.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 9.62 V (1.39%) | 680.4 V | 15.86 V (2.3%) | 6662.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 7.41 V (1.07%) | 682.6 V | 12.23 V (1.77%) | 5136.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 5.93 V (0.86%) | 684.1 V | 9.78 V (1.42%) | 4108.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 4.45 V (0.64%) | 685.6 V | 7.34 V (1.06%) | 3081.6 W | ✓ OK (≤3%) |
FAQ — 400 Amp Cable Size at 120 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 400A at 120 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 120m at 690V (voltage drop: 7.41V or 1.07%).
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 · 120m (690V)16A · 120m (690V)20A · 120m (690V)25A · 120m (690V)32A · 120m (690V)40A · 120m (690V)50A · 120m (690V)63A · 120m (690V)80A · 120m (690V)100A · 120m (690V)125A · 120m (690V)160A · 120m (690V)200A · 120m (690V)