40 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 40 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 10.59V (2.65%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 8.73V (2.18%)
Voltage at Load389.4 VLine Loss: 733.7 W
Max Power & Breaker27.71 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A 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 | 247.11 V (61.78%) | 152.9 V | 407.61 V (101.9%) | 17120.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 148.26 V (37.07%) | 251.7 V | 244.57 V (61.14%) | 10272.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 92.66 V (23.17%) | 307.3 V | 152.85 V (38.21%) | 6420.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 61.78 V (15.44%) | 338.2 V | 101.9 V (25.48%) | 4280.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 37.07 V (9.27%) | 362.9 V | 61.14 V (15.29%) | 2568.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 23.17 V (5.79%) | 376.8 V | 38.21 V (9.55%) | 1605.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 14.83 V (3.71%) | 385.2 V | 24.46 V (6.11%) | 1027.2 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 10.59 V (2.65%) | 389.4 V | 17.47 V (4.37%) | 733.7 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 7.41 V (1.85%) | 392.6 V | 12.23 V (3.06%) | 513.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 5.3 V (1.32%) | 394.7 V | 8.73 V (2.18%) | 366.9 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 3.9 V (0.98%) | 396.1 V | 6.44 V (1.61%) | 270.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.09 V (0.77%) | 396.9 V | 5.1 V (1.27%) | 214.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.47 V (0.62%) | 397.5 V | 4.08 V (1.02%) | 171.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.0 V (0.5%) | 398.0 V | 3.3 V (0.83%) | 138.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.54 V (0.39%) | 398.5 V | 2.55 V (0.64%) | 107.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.24 V (0.31%) | 398.8 V | 2.04 V (0.51%) | 85.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.93 V (0.23%) | 399.1 V | 1.53 V (0.38%) | 64.2 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 250 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 40A 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 40A over 250m at 400V (voltage drop: 10.59V or 2.65%).
What is the power capacity of 40A at 400V?
At unity power factor, 40A at 400V supports 27.71 kW with a standard 40A circuit breaker.
Related Lengths & Currents (400V)
40A · 5m (400V)40A · 10m (400V)40A · 15m (400V)40A · 20m (400V)40A · 25m (400V)40A · 30m (400V)40A · 35m (400V)40A · 40m (400V)40A · 45m (400V)40A · 50m (400V)40A · 60m (400V)40A · 70m (400V)10A · 250m (400V)16A · 250m (400V)20A · 250m (400V)25A · 250m (400V)32A · 250m (400V)50A · 250m (400V)63A · 250m (400V)80A · 250m (400V)100A · 250m (400V)125A · 250m (400V)160A · 250m (400V)200A · 250m (400V)