45 Amp Cable Size at 250 Meters (400V Three-Phase (IEC European Grid))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 45 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 11.91V (2.98%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 9.83V (2.46%)
Voltage at Load388.1 VLine Loss: 928.6 W
Max Power & Breaker31.18 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A 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 | 277.99 V (69.5%) | 122.0 V | 458.56 V (114.64%) | 21667.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 166.8 V (41.7%) | 233.2 V | 275.14 V (68.78%) | 13000.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 104.25 V (26.06%) | 295.8 V | 171.96 V (42.99%) | 8125.3 W | Drop High |
| 6 mm² | 41 A | 32 A | 69.5 V (17.37%) | 330.5 V | 114.64 V (28.66%) | 5416.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 41.7 V (10.42%) | 358.3 V | 68.78 V (17.2%) | 3250.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 26.06 V (6.52%) | 373.9 V | 42.99 V (10.75%) | 2031.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 16.68 V (4.17%) | 383.3 V | 27.51 V (6.88%) | 1300.0 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 11.91 V (2.98%) | 388.1 V | 19.65 V (4.91%) | 928.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 8.34 V (2.08%) | 391.7 V | 13.76 V (3.44%) | 650.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 5.96 V (1.49%) | 394.0 V | 9.83 V (2.46%) | 464.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 4.39 V (1.1%) | 395.6 V | 7.24 V (1.81%) | 342.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.47 V (0.87%) | 396.5 V | 5.73 V (1.43%) | 270.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.78 V (0.69%) | 397.2 V | 4.59 V (1.15%) | 216.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.25 V (0.56%) | 397.7 V | 3.72 V (0.93%) | 175.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.74 V (0.43%) | 398.3 V | 2.87 V (0.72%) | 135.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.39 V (0.35%) | 398.6 V | 2.29 V (0.57%) | 108.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.04 V (0.26%) | 399.0 V | 1.72 V (0.43%) | 81.3 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 250 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 45A at 250 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 45A over 250m at 400V (voltage drop: 11.91V or 2.98%).
What is the power capacity of 45A at 400V?
At unity power factor, 45A at 400V supports 31.18 kW with a standard 45A circuit breaker.
Related Lengths & Currents (400V)
45A · 5m (400V)45A · 10m (400V)45A · 15m (400V)45A · 20m (400V)45A · 25m (400V)45A · 30m (400V)45A · 35m (400V)45A · 40m (400V)45A · 45m (400V)45A · 50m (400V)45A · 60m (400V)45A · 70m (400V)10A · 250m (400V)16A · 250m (400V)20A · 250m (400V)25A · 250m (400V)32A · 250m (400V)40A · 250m (400V)50A · 250m (400V)63A · 250m (400V)80A · 250m (400V)100A · 250m (400V)125A · 250m (400V)160A · 250m (400V)200A · 250m (400V)