20 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 20 A over 350 m (1148.3 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 16.22V (2.35%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 17.12V (2.48%)
Voltage at Load673.8 VLine Loss: 561.8 W
Max Power & Breaker23.9 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A 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 | 172.97 V (25.07%) | 517.0 V | 285.33 V (41.35%) | 5992.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 103.78 V (15.04%) | 586.2 V | 171.2 V (24.81%) | 3595.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 64.87 V (9.4%) | 625.1 V | 107.0 V (15.51%) | 2247.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 43.24 V (6.27%) | 646.8 V | 71.33 V (10.34%) | 1498.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 25.95 V (3.76%) | 664.1 V | 42.8 V (6.2%) | 898.8 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 16.22 V (2.35%) | 673.8 V | 26.75 V (3.88%) | 561.8 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 10.38 V (1.5%) | 679.6 V | 17.12 V (2.48%) | 359.5 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 7.41 V (1.07%) | 682.6 V | 12.23 V (1.77%) | 256.8 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 5.19 V (0.75%) | 684.8 V | 8.56 V (1.24%) | 179.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.71 V (0.54%) | 686.3 V | 6.11 V (0.89%) | 128.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.73 V (0.4%) | 687.3 V | 4.51 V (0.65%) | 94.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 2.16 V (0.31%) | 687.8 V | 3.57 V (0.52%) | 74.9 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.73 V (0.25%) | 688.3 V | 2.85 V (0.41%) | 59.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.4 V (0.2%) | 688.6 V | 2.31 V (0.34%) | 48.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.08 V (0.16%) | 688.9 V | 1.78 V (0.26%) | 37.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.86 V (0.13%) | 689.1 V | 1.43 V (0.21%) | 30.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.65 V (0.09%) | 689.4 V | 1.07 V (0.16%) | 22.5 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 350 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 20A at 350 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 20A over 350m at 690V (voltage drop: 16.22V or 2.35%).
What is the power capacity of 20A at 690V?
At unity power factor, 20A at 690V supports 23.9 kW with a standard 20A circuit breaker.
Related Lengths & Currents (690V)
20A · 5m (690V)20A · 10m (690V)20A · 15m (690V)20A · 20m (690V)20A · 25m (690V)20A · 30m (690V)20A · 35m (690V)20A · 40m (690V)20A · 45m (690V)20A · 50m (690V)20A · 60m (690V)20A · 70m (690V)10A · 350m (690V)16A · 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)