250 Amp Cable Size at 15 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 15 m (49.2 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 1.16V (0.17%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 1.24V (0.18%)
Voltage at Load688.8 VLine Loss: 501.6 W
Max Power & Breaker298.78 kW250A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 250A at 15m
| 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 | 92.66 V (13.43%) | 597.3 V | 152.85 V (22.15%) | 40125.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 55.6 V (8.06%) | 634.4 V | 91.71 V (13.29%) | 24075.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 34.75 V (5.04%) | 655.3 V | 57.32 V (8.31%) | 15046.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 23.17 V (3.36%) | 666.8 V | 38.21 V (5.54%) | 10031.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 13.9 V (2.01%) | 676.1 V | 22.93 V (3.32%) | 6018.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 8.69 V (1.26%) | 681.3 V | 14.33 V (2.08%) | 3761.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 5.56 V (0.81%) | 684.4 V | 9.17 V (1.33%) | 2407.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 3.97 V (0.58%) | 686.0 V | 6.55 V (0.95%) | 1719.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 2.78 V (0.4%) | 687.2 V | 4.59 V (0.66%) | 1203.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.99 V (0.29%) | 688.0 V | 3.28 V (0.47%) | 859.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.46 V (0.21%) | 688.5 V | 2.41 V (0.35%) | 633.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.16 V (0.17%) | 688.8 V | 1.91 V (0.28%) | 501.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.93 V (0.13%) | 689.1 V | 1.53 V (0.22%) | 401.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.75 V (0.11%) | 689.2 V | 1.24 V (0.18%) | 325.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.58 V (0.08%) | 689.4 V | 0.96 V (0.14%) | 250.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.46 V (0.07%) | 689.5 V | 0.76 V (0.11%) | 200.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.35 V (0.05%) | 689.7 V | 0.57 V (0.08%) | 150.5 W | ✓ OK (≤3%) |
FAQ — 250 Amp Cable Size at 15 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 250A at 15 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 15m at 690V (voltage drop: 1.16V or 0.17%).
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 · 20m (690V)250A · 25m (690V)250A · 30m (690V)250A · 35m (690V)250A · 40m (690V)250A · 45m (690V)250A · 50m (690V)250A · 60m (690V)250A · 70m (690V)10A · 15m (690V)16A · 15m (690V)20A · 15m (690V)25A · 15m (690V)32A · 15m (690V)40A · 15m (690V)50A · 15m (690V)63A · 15m (690V)80A · 15m (690V)100A · 15m (690V)125A · 15m (690V)160A · 15m (690V)200A · 15m (690V)