250 Amp Cable Size at 120 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 120 m (393.7 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 9.27V (2.23%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 9.91V (2.39%)
Voltage at Load405.7 VLine Loss: 4012.5 W
Max Power & Breaker179.7 kW250A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 250A at 120m
| 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 | 741.32 V (178.63%) | 0.0 V | 1222.83 V (294.66%) | 321000.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 444.79 V (107.18%) | 0.0 V | 733.7 V (176.79%) | 192600.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 277.99 V (66.99%) | 137.0 V | 458.56 V (110.5%) | 120375.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 185.33 V (44.66%) | 229.7 V | 305.71 V (73.66%) | 80250.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 111.2 V (26.79%) | 303.8 V | 183.42 V (44.2%) | 48150.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 69.5 V (16.75%) | 345.5 V | 114.64 V (27.62%) | 30093.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 44.48 V (10.72%) | 370.5 V | 73.37 V (17.68%) | 19260.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 31.77 V (7.66%) | 383.2 V | 52.41 V (12.63%) | 13757.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 22.24 V (5.36%) | 392.8 V | 36.68 V (8.84%) | 9630.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 15.89 V (3.83%) | 399.1 V | 26.2 V (6.31%) | 6878.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 11.71 V (2.82%) | 403.3 V | 19.31 V (4.65%) | 5068.4 W | Drop High |
| 120 mm² | 269 A | 210 A | 9.27 V (2.23%) | 405.7 V | 15.29 V (3.68%) | 4012.5 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 7.41 V (1.79%) | 407.6 V | 12.23 V (2.95%) | 3210.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 6.01 V (1.45%) | 409.0 V | 9.91 V (2.39%) | 2602.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 4.63 V (1.12%) | 410.4 V | 7.64 V (1.84%) | 2006.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 3.71 V (0.89%) | 411.3 V | 6.11 V (1.47%) | 1605.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 2.78 V (0.67%) | 412.2 V | 4.59 V (1.1%) | 1203.8 W | ✓ OK (≤3%) |
FAQ — 250 Amp Cable Size at 120 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 250A at 120 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 120m at 415V (voltage drop: 9.27V or 2.23%).
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 · 120m (415V)16A · 120m (415V)20A · 120m (415V)25A · 120m (415V)32A · 120m (415V)40A · 120m (415V)50A · 120m (415V)63A · 120m (415V)80A · 120m (415V)100A · 120m (415V)125A · 120m (415V)160A · 120m (415V)200A · 120m (415V)