250 Amp Cable Size at 250 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 250 m (820.2 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 9.65V (2.33%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 9.55V (2.3%)
Voltage at Load405.3 VLine Loss: 4179.7 W
Max Power & Breaker179.7 kW250A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 250A 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 | 1544.41 V (372.15%) | 0.0 V | 2547.56 V (613.87%) | 668750.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 926.65 V (223.29%) | 0.0 V | 1528.53 V (368.32%) | 401250.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 579.15 V (139.56%) | 0.0 V | 955.33 V (230.2%) | 250781.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 386.1 V (93.04%) | 28.9 V | 636.89 V (153.47%) | 167187.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 231.66 V (55.82%) | 183.3 V | 382.13 V (92.08%) | 100312.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 144.79 V (34.89%) | 270.2 V | 238.83 V (57.55%) | 62695.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 92.66 V (22.33%) | 322.3 V | 152.85 V (36.83%) | 40125.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 66.19 V (15.95%) | 348.8 V | 109.18 V (26.31%) | 28660.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 46.33 V (11.16%) | 368.7 V | 76.43 V (18.42%) | 20062.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 33.09 V (7.97%) | 381.9 V | 54.59 V (13.15%) | 14330.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 24.39 V (5.88%) | 390.6 V | 40.22 V (9.69%) | 10559.2 W | Drop High |
| 120 mm² | 269 A | 210 A | 19.31 V (4.65%) | 395.7 V | 31.84 V (7.67%) | 8359.4 W | ~ ≤5% |
| 150 mm² | 309 A | 241 A | 15.44 V (3.72%) | 399.6 V | 25.48 V (6.14%) | 6687.5 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 12.52 V (3.02%) | 402.5 V | 20.66 V (4.98%) | 5422.3 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 9.65 V (2.33%) | 405.3 V | 15.92 V (3.84%) | 4179.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 7.72 V (1.86%) | 407.3 V | 12.74 V (3.07%) | 3343.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 5.79 V (1.4%) | 409.2 V | 9.55 V (2.3%) | 2507.8 W | ✓ OK (≤3%) |
FAQ — 250 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 250A at 250 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 250A over 250m at 415V (voltage drop: 9.65V or 2.33%).
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 · 15m (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 · 250m (415V)16A · 250m (415V)20A · 250m (415V)25A · 250m (415V)32A · 250m (415V)40A · 250m (415V)50A · 250m (415V)63A · 250m (415V)80A · 250m (415V)100A · 250m (415V)125A · 250m (415V)160A · 250m (415V)200A · 250m (415V)