40 Amp Cable Size at 250 Meters (230V Single-Phase (IEC Europe / UK / AU))
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)70 mm²Drop: 6.11V (2.66%)
Aluminum Cable (≤3% Drop)120 mm²Drop: 5.88V (2.56%)
Voltage at Load223.9 VLine Loss: 244.6 W
Max Power & Breaker9.2 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 | 285.33 V (124.06%) | 0.0 V | 470.67 V (204.64%) | 11413.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 171.2 V (74.43%) | 58.8 V | 282.4 V (122.78%) | 6848.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 107.0 V (46.52%) | 123.0 V | 176.5 V (76.74%) | 4280.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 71.33 V (31.01%) | 158.7 V | 117.67 V (51.16%) | 2853.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 42.8 V (18.61%) | 187.2 V | 70.6 V (30.7%) | 1712.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 26.75 V (11.63%) | 203.2 V | 44.12 V (19.18%) | 1070.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 17.12 V (7.44%) | 212.9 V | 28.24 V (12.28%) | 684.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 12.23 V (5.32%) | 217.8 V | 20.17 V (8.77%) | 489.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 8.56 V (3.72%) | 221.4 V | 14.12 V (6.14%) | 342.4 W | ~ ≤5% |
| 70 mm² | 192 A | 150 A | 6.11 V (2.66%) | 223.9 V | 10.09 V (4.39%) | 244.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 4.51 V (1.96%) | 225.5 V | 7.43 V (3.23%) | 180.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.57 V (1.55%) | 226.4 V | 5.88 V (2.56%) | 142.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.85 V (1.24%) | 227.1 V | 4.71 V (2.05%) | 114.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.31 V (1.01%) | 227.7 V | 3.82 V (1.66%) | 92.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.78 V (0.78%) | 228.2 V | 2.94 V (1.28%) | 71.3 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.43 V (0.62%) | 228.6 V | 2.35 V (1.02%) | 57.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.07 V (0.47%) | 228.9 V | 1.76 V (0.77%) | 42.8 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 250 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 40A at 250 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 70 mm² copper cable for 40A over 250m at 230V (voltage drop: 6.11V or 2.66%).
What is the power capacity of 40A at 230V?
At unity power factor, 40A at 230V supports 9.2 kW with a standard 40A circuit breaker.
Related Lengths & Currents (230V)
40A · 5m (230V)40A · 10m (230V)40A · 15m (230V)40A · 20m (230V)40A · 25m (230V)40A · 30m (230V)40A · 35m (230V)40A · 40m (230V)40A · 45m (230V)40A · 50m (230V)40A · 60m (230V)40A · 70m (230V)10A · 250m (230V)16A · 250m (230V)20A · 250m (230V)25A · 250m (230V)32A · 250m (230V)50A · 250m (230V)63A · 250m (230V)80A · 250m (230V)100A · 250m (230V)125A · 250m (230V)160A · 250m (230V)200A · 250m (230V)