300 Amp Cable Size at 70 Meters (400V Three-Phase (IEC European Grid))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 300 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 5.19V (1.3%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 5.35V (1.34%)
Voltage at Load394.8 VLine Loss: 2696.4 W
Max Power & Breaker207.85 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A 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 | 518.92 V (129.73%) | 0.0 V | 855.98 V (213.99%) | 269640.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 311.35 V (77.84%) | 88.6 V | 513.59 V (128.4%) | 161784.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 194.6 V (48.65%) | 205.4 V | 320.99 V (80.25%) | 101115.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 129.73 V (32.43%) | 270.3 V | 213.99 V (53.5%) | 67410.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 77.84 V (19.46%) | 322.2 V | 128.4 V (32.1%) | 40446.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 48.65 V (12.16%) | 351.4 V | 80.25 V (20.06%) | 25278.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 31.14 V (7.78%) | 368.9 V | 51.36 V (12.84%) | 16178.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 22.24 V (5.56%) | 377.8 V | 36.68 V (9.17%) | 11556.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 15.57 V (3.89%) | 384.4 V | 25.68 V (6.42%) | 8089.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 11.12 V (2.78%) | 388.9 V | 18.34 V (4.59%) | 5778.0 W | Drop High |
| 95 mm² | 232 A | 181 A | 8.19 V (2.05%) | 391.8 V | 13.52 V (3.38%) | 4257.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 6.49 V (1.62%) | 393.5 V | 10.7 V (2.67%) | 3370.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 5.19 V (1.3%) | 394.8 V | 8.56 V (2.14%) | 2696.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 4.21 V (1.05%) | 395.8 V | 6.94 V (1.74%) | 2186.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 3.24 V (0.81%) | 396.8 V | 5.35 V (1.34%) | 1685.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 2.59 V (0.65%) | 397.4 V | 4.28 V (1.07%) | 1348.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.95 V (0.49%) | 398.1 V | 3.21 V (0.8%) | 1011.1 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 70 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 300A at 70 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 300A over 70m at 400V (voltage drop: 5.19V or 1.3%).
What is the power capacity of 300A at 400V?
At unity power factor, 300A at 400V supports 207.85 kW with a standard 300A circuit breaker.
Related Lengths & Currents (400V)
300A · 5m (400V)300A · 10m (400V)300A · 15m (400V)300A · 20m (400V)300A · 25m (400V)300A · 30m (400V)300A · 35m (400V)300A · 40m (400V)300A · 45m (400V)300A · 50m (400V)300A · 60m (400V)10A · 70m (400V)16A · 70m (400V)20A · 70m (400V)25A · 70m (400V)32A · 70m (400V)40A · 70m (400V)50A · 70m (400V)63A · 70m (400V)80A · 70m (400V)100A · 70m (400V)125A · 70m (400V)160A · 70m (400V)200A · 70m (400V)