400 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 400 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 12.36V (2.98%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 15.29V (3.68%)
Voltage at Load402.6 VLine Loss: 8560.0 W
Max Power & Breaker287.52 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A 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 | 2471.06 V (595.44%) | 0.0 V | 4076.09 V (982.19%) | 1712000.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1482.64 V (357.26%) | 0.0 V | 2445.66 V (589.31%) | 1027200.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 926.65 V (223.29%) | 0.0 V | 1528.53 V (368.32%) | 642000.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 617.76 V (148.86%) | 0.0 V | 1019.02 V (245.55%) | 428000.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 370.66 V (89.32%) | 44.3 V | 611.41 V (147.33%) | 256800.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 231.66 V (55.82%) | 183.3 V | 382.13 V (92.08%) | 160500.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 148.26 V (35.73%) | 266.7 V | 244.57 V (58.93%) | 102720.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 105.9 V (25.52%) | 309.1 V | 174.69 V (42.09%) | 73371.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 74.13 V (17.86%) | 340.9 V | 122.28 V (29.47%) | 51360.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 52.95 V (12.76%) | 362.0 V | 87.34 V (21.05%) | 36685.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 39.02 V (9.4%) | 376.0 V | 64.36 V (15.51%) | 27031.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 30.89 V (7.44%) | 384.1 V | 50.95 V (12.28%) | 21400.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 24.71 V (5.95%) | 390.3 V | 40.76 V (9.82%) | 17120.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 20.04 V (4.83%) | 395.0 V | 33.05 V (7.96%) | 13881.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 15.44 V (3.72%) | 399.6 V | 25.48 V (6.14%) | 10700.0 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 12.36 V (2.98%) | 402.6 V | 20.38 V (4.91%) | 8560.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 9.27 V (2.23%) | 405.7 V | 15.29 V (3.68%) | 6420.0 W | ✓ OK (≤3%) |
FAQ — 400 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 400A at 250 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 400A over 250m at 415V (voltage drop: 12.36V or 2.98%).
What is the power capacity of 400A at 415V?
At unity power factor, 400A at 415V supports 287.52 kW with a standard 400A circuit breaker.
Related Lengths & Currents (415V)
400A · 5m (415V)400A · 10m (415V)400A · 15m (415V)400A · 20m (415V)400A · 25m (415V)400A · 30m (415V)400A · 35m (415V)400A · 40m (415V)400A · 45m (415V)400A · 50m (415V)400A · 60m (415V)400A · 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)