70 Amp Cable Size at 350 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 70 A over 350 m (1148.3 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 18.16V (2.63%)
Aluminum Cable (≤3% Drop)95 mm²Drop: 15.77V (2.29%)
Voltage at Load671.8 VLine Loss: 2202.1 W
Max Power & Breaker83.66 kW70A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 70A at 350m
| 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 | 605.41 V (87.74%) | 84.6 V | 998.64 V (144.73%) | 73402.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 363.25 V (52.64%) | 326.8 V | 599.19 V (86.84%) | 44041.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 227.03 V (32.9%) | 463.0 V | 374.49 V (54.27%) | 27525.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 151.35 V (21.94%) | 538.6 V | 249.66 V (36.18%) | 18350.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 90.81 V (13.16%) | 599.2 V | 149.8 V (21.71%) | 11010.3 W | Drop High |
| 16 mm² | 76 A | 59 A | 56.76 V (8.23%) | 633.2 V | 93.62 V (13.57%) | 6881.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 36.32 V (5.26%) | 653.7 V | 59.92 V (8.68%) | 4404.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 25.95 V (3.76%) | 664.1 V | 42.8 V (6.2%) | 3145.8 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 18.16 V (2.63%) | 671.8 V | 29.96 V (4.34%) | 2202.1 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 12.97 V (1.88%) | 677.0 V | 21.4 V (3.1%) | 1572.9 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 9.56 V (1.39%) | 680.4 V | 15.77 V (2.29%) | 1159.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 7.57 V (1.1%) | 682.4 V | 12.48 V (1.81%) | 917.5 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 6.05 V (0.88%) | 683.9 V | 9.99 V (1.45%) | 734.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 4.91 V (0.71%) | 685.1 V | 8.1 V (1.17%) | 595.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 3.78 V (0.55%) | 686.2 V | 6.24 V (0.9%) | 458.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 3.03 V (0.44%) | 687.0 V | 4.99 V (0.72%) | 367.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 2.27 V (0.33%) | 687.7 V | 3.74 V (0.54%) | 275.3 W | ✓ OK (≤3%) |
FAQ — 70 Amp Cable Size at 350 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 70A at 350 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 70A over 350m at 690V (voltage drop: 18.16V or 2.63%).
What is the power capacity of 70A at 690V?
At unity power factor, 70A at 690V supports 83.66 kW with a standard 70A circuit breaker.
Related Lengths & Currents (690V)
70A · 5m (690V)70A · 10m (690V)70A · 15m (690V)70A · 20m (690V)70A · 25m (690V)70A · 30m (690V)70A · 35m (690V)70A · 40m (690V)70A · 45m (690V)70A · 50m (690V)70A · 60m (690V)70A · 70m (690V)10A · 350m (690V)16A · 350m (690V)20A · 350m (690V)25A · 350m (690V)32A · 350m (690V)40A · 350m (690V)50A · 350m (690V)63A · 350m (690V)80A · 350m (690V)100A · 350m (690V)125A · 350m (690V)160A · 350m (690V)200A · 350m (690V)