250 Amp Cable Size at 45 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 250 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 3.47V (0.5%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 3.72V (0.54%)
Voltage at Load686.5 VLine Loss: 1504.7 W
Max Power & Breaker298.78 kW250A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 250A at 45m
| 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 | 277.99 V (40.29%) | 412.0 V | 458.56 V (66.46%) | 120375.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 166.8 V (24.17%) | 523.2 V | 275.14 V (39.87%) | 72225.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 104.25 V (15.11%) | 585.8 V | 171.96 V (24.92%) | 45140.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 69.5 V (10.07%) | 620.5 V | 114.64 V (16.61%) | 30093.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 41.7 V (6.04%) | 648.3 V | 68.78 V (9.97%) | 18056.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 26.06 V (3.78%) | 663.9 V | 42.99 V (6.23%) | 11285.2 W | Drop High |
| 25 mm² | 101 A | 78 A | 16.68 V (2.42%) | 673.3 V | 27.51 V (3.99%) | 7222.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 11.91 V (1.73%) | 678.1 V | 19.65 V (2.85%) | 5158.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 8.34 V (1.21%) | 681.7 V | 13.76 V (1.99%) | 3611.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.96 V (0.86%) | 684.0 V | 9.83 V (1.42%) | 2579.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 4.39 V (0.64%) | 685.6 V | 7.24 V (1.05%) | 1900.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.47 V (0.5%) | 686.5 V | 5.73 V (0.83%) | 1504.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.78 V (0.4%) | 687.2 V | 4.59 V (0.66%) | 1203.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.25 V (0.33%) | 687.7 V | 3.72 V (0.54%) | 976.0 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.74 V (0.25%) | 688.3 V | 2.87 V (0.42%) | 752.3 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.39 V (0.2%) | 688.6 V | 2.29 V (0.33%) | 601.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.04 V (0.15%) | 689.0 V | 1.72 V (0.25%) | 451.4 W | ✓ OK (≤3%) |
FAQ — 250 Amp Cable Size at 45 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 250A at 45 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 120 mm² copper cable for 250A over 45m at 690V (voltage drop: 3.47V or 0.5%).
What is the power capacity of 250A at 690V?
At unity power factor, 250A at 690V supports 298.78 kW with a standard 250A circuit breaker.
Related Lengths & Currents (690V)
250A · 5m (690V)250A · 10m (690V)250A · 15m (690V)250A · 20m (690V)250A · 25m (690V)250A · 30m (690V)250A · 35m (690V)250A · 40m (690V)250A · 50m (690V)250A · 60m (690V)250A · 70m (690V)10A · 45m (690V)16A · 45m (690V)20A · 45m (690V)25A · 45m (690V)32A · 45m (690V)40A · 45m (690V)50A · 45m (690V)63A · 45m (690V)80A · 45m (690V)100A · 45m (690V)125A · 45m (690V)160A · 45m (690V)200A · 45m (690V)