300 Amp Cable Size at 30 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 300 A over 30 m (98.4 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 2.22V (0.32%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 2.29V (0.33%)
Voltage at Load687.8 VLine Loss: 1155.6 W
Max Power & Breaker358.53 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A at 30m
| 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 | 222.4 V (32.23%) | 467.6 V | 366.85 V (53.17%) | 115560.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 133.44 V (19.34%) | 556.6 V | 220.11 V (31.9%) | 69336.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 83.4 V (12.09%) | 606.6 V | 137.57 V (19.94%) | 43335.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 55.6 V (8.06%) | 634.4 V | 91.71 V (13.29%) | 28890.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 33.36 V (4.83%) | 656.6 V | 55.03 V (7.97%) | 17334.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 20.85 V (3.02%) | 669.2 V | 34.39 V (4.98%) | 10833.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 13.34 V (1.93%) | 676.7 V | 22.01 V (3.19%) | 6933.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 9.53 V (1.38%) | 680.5 V | 15.72 V (2.28%) | 4952.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 6.67 V (0.97%) | 683.3 V | 11.01 V (1.59%) | 3466.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 4.77 V (0.69%) | 685.2 V | 7.86 V (1.14%) | 2476.3 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.51 V (0.51%) | 686.5 V | 5.79 V (0.84%) | 1824.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.78 V (0.4%) | 687.2 V | 4.59 V (0.66%) | 1444.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.22 V (0.32%) | 687.8 V | 3.67 V (0.53%) | 1155.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.8 V (0.26%) | 688.2 V | 2.97 V (0.43%) | 937.0 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.39 V (0.2%) | 688.6 V | 2.29 V (0.33%) | 722.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.11 V (0.16%) | 688.9 V | 1.83 V (0.27%) | 577.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.83 V (0.12%) | 689.2 V | 1.38 V (0.2%) | 433.4 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 30 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 30 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 300A over 30m at 690V (voltage drop: 2.22V or 0.32%).
What is the power capacity of 300A at 690V?
At unity power factor, 300A at 690V supports 358.53 kW with a standard 300A circuit breaker.
Related Lengths & Currents (690V)
300A · 5m (690V)300A · 10m (690V)300A · 15m (690V)300A · 20m (690V)300A · 25m (690V)300A · 35m (690V)300A · 40m (690V)300A · 45m (690V)300A · 50m (690V)300A · 60m (690V)300A · 70m (690V)10A · 30m (690V)16A · 30m (690V)20A · 30m (690V)25A · 30m (690V)32A · 30m (690V)40A · 30m (690V)50A · 30m (690V)63A · 30m (690V)80A · 30m (690V)100A · 30m (690V)125A · 30m (690V)160A · 30m (690V)200A · 30m (690V)