50 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 50 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 18.53V (2.69%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 15.29V (2.22%)
Voltage at Load671.5 VLine Loss: 1605.0 W
Max Power & Breaker59.76 kW50A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 50A at 250m
| 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 | 308.88 V (44.77%) | 381.1 V | 509.51 V (73.84%) | 26750.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 185.33 V (26.86%) | 504.7 V | 305.71 V (44.31%) | 16050.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 115.83 V (16.79%) | 574.2 V | 191.07 V (27.69%) | 10031.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 77.22 V (11.19%) | 612.8 V | 127.38 V (18.46%) | 6687.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 46.33 V (6.71%) | 643.7 V | 76.43 V (11.08%) | 4012.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 28.96 V (4.2%) | 661.0 V | 47.77 V (6.92%) | 2507.8 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 1605.0 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 13.24 V (1.92%) | 676.8 V | 21.84 V (3.16%) | 1146.4 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 9.27 V (1.34%) | 680.7 V | 15.29 V (2.22%) | 802.5 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 6.62 V (0.96%) | 683.4 V | 10.92 V (1.58%) | 573.2 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 4.88 V (0.71%) | 685.1 V | 8.04 V (1.17%) | 422.4 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.86 V (0.56%) | 686.1 V | 6.37 V (0.92%) | 334.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 3.09 V (0.45%) | 686.9 V | 5.1 V (0.74%) | 267.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.5 V (0.36%) | 687.5 V | 4.13 V (0.6%) | 216.9 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.93 V (0.28%) | 688.1 V | 3.18 V (0.46%) | 167.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.54 V (0.22%) | 688.5 V | 2.55 V (0.37%) | 133.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.16 V (0.17%) | 688.8 V | 1.91 V (0.28%) | 100.3 W | ✓ OK (≤3%) |
FAQ — 50 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 50A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 50A over 250m at 690V (voltage drop: 18.53V or 2.69%).
What is the power capacity of 50A at 690V?
At unity power factor, 50A at 690V supports 59.76 kW with a standard 50A circuit breaker.
Related Lengths & Currents (690V)
50A · 5m (690V)50A · 10m (690V)50A · 15m (690V)50A · 20m (690V)50A · 25m (690V)50A · 30m (690V)50A · 35m (690V)50A · 40m (690V)50A · 45m (690V)50A · 50m (690V)50A · 60m (690V)50A · 70m (690V)10A · 250m (690V)16A · 250m (690V)20A · 250m (690V)25A · 250m (690V)32A · 250m (690V)40A · 250m (690V)63A · 250m (690V)80A · 250m (690V)100A · 250m (690V)125A · 250m (690V)160A · 250m (690V)200A · 250m (690V)