250 Amp Cable Size at 15 Meters (415V Three-Phase (UK / Australia 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 (0.28%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 1.24V (0.3%)
Voltage at Load413.8 VLine Loss: 501.6 W
Max Power & Breaker179.7 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 (22.33%) | 322.3 V | 152.85 V (36.83%) | 40125.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 55.6 V (13.4%) | 359.4 V | 91.71 V (22.1%) | 24075.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 34.75 V (8.37%) | 380.3 V | 57.32 V (13.81%) | 15046.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 23.17 V (5.58%) | 391.8 V | 38.21 V (9.21%) | 10031.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 13.9 V (3.35%) | 401.1 V | 22.93 V (5.52%) | 6018.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 8.69 V (2.09%) | 406.3 V | 14.33 V (3.45%) | 3761.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 5.56 V (1.34%) | 409.4 V | 9.17 V (2.21%) | 2407.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 3.97 V (0.96%) | 411.0 V | 6.55 V (1.58%) | 1719.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 2.78 V (0.67%) | 412.2 V | 4.59 V (1.1%) | 1203.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.99 V (0.48%) | 413.0 V | 3.28 V (0.79%) | 859.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.46 V (0.35%) | 413.5 V | 2.41 V (0.58%) | 633.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.16 V (0.28%) | 413.8 V | 1.91 V (0.46%) | 501.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.93 V (0.22%) | 414.1 V | 1.53 V (0.37%) | 401.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.75 V (0.18%) | 414.2 V | 1.24 V (0.3%) | 325.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.58 V (0.14%) | 414.4 V | 0.96 V (0.23%) | 250.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.46 V (0.11%) | 414.5 V | 0.76 V (0.18%) | 200.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.35 V (0.08%) | 414.7 V | 0.57 V (0.14%) | 150.5 W | ✓ OK (≤3%) |
FAQ — 250 Amp Cable Size at 15 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 250A at 15 meters (415V)?
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 415V (voltage drop: 1.16V or 0.28%).
What is the power capacity of 250A at 415V?
At unity power factor, 250A at 415V supports 179.7 kW with a standard 250A circuit breaker.
Related Lengths & Currents (415V)
250A · 5m (415V)250A · 10m (415V)250A · 20m (415V)250A · 25m (415V)250A · 30m (415V)250A · 35m (415V)250A · 40m (415V)250A · 45m (415V)250A · 50m (415V)250A · 60m (415V)250A · 70m (415V)10A · 15m (415V)16A · 15m (415V)20A · 15m (415V)25A · 15m (415V)32A · 15m (415V)40A · 15m (415V)50A · 15m (415V)63A · 15m (415V)80A · 15m (415V)100A · 15m (415V)125A · 15m (415V)160A · 15m (415V)200A · 15m (415V)