300 Amp Cable Size at 70 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 70 m (229.7 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 5.19V (0.75%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 5.35V (0.78%)
Voltage at Load684.8 VLine Loss: 2696.4 W
Max Power & Breaker358.53 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 (75.21%) | 171.1 V | 855.98 V (124.06%) | 269640.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 311.35 V (45.12%) | 378.6 V | 513.59 V (74.43%) | 161784.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 194.6 V (28.2%) | 495.4 V | 320.99 V (46.52%) | 101115.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 129.73 V (18.8%) | 560.3 V | 213.99 V (31.01%) | 67410.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 77.84 V (11.28%) | 612.2 V | 128.4 V (18.61%) | 40446.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 48.65 V (7.05%) | 641.4 V | 80.25 V (11.63%) | 25278.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 31.14 V (4.51%) | 658.9 V | 51.36 V (7.44%) | 16178.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 22.24 V (3.22%) | 667.8 V | 36.68 V (5.32%) | 11556.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 15.57 V (2.26%) | 674.4 V | 25.68 V (3.72%) | 8089.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 5778.0 W | Drop High |
| 95 mm² | 232 A | 181 A | 8.19 V (1.19%) | 681.8 V | 13.52 V (1.96%) | 4257.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 6.49 V (0.94%) | 683.5 V | 10.7 V (1.55%) | 3370.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 5.19 V (0.75%) | 684.8 V | 8.56 V (1.24%) | 2696.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 4.21 V (0.61%) | 685.8 V | 6.94 V (1.01%) | 2186.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 3.24 V (0.47%) | 686.8 V | 5.35 V (0.78%) | 1685.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 2.59 V (0.38%) | 687.4 V | 4.28 V (0.62%) | 1348.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.95 V (0.28%) | 688.1 V | 3.21 V (0.47%) | 1011.1 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 70 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 70 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 70m at 690V (voltage drop: 5.19V or 0.75%).
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 · 30m (690V)300A · 35m (690V)300A · 40m (690V)300A · 45m (690V)300A · 50m (690V)300A · 60m (690V)10A · 70m (690V)16A · 70m (690V)20A · 70m (690V)25A · 70m (690V)32A · 70m (690V)40A · 70m (690V)50A · 70m (690V)63A · 70m (690V)80A · 70m (690V)100A · 70m (690V)125A · 70m (690V)160A · 70m (690V)200A · 70m (690V)