125 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 125 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 5.57V (2.42%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 5.52V (2.4%)
Voltage at Load224.4 VLine Loss: 696.6 W
Max Power & Breaker28.75 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A 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 | 891.67 V (387.68%) | 0.0 V | 1470.83 V (639.49%) | 111458.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 535.0 V (232.61%) | 0.0 V | 882.5 V (383.7%) | 66875.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 334.38 V (145.38%) | 0.0 V | 551.56 V (239.81%) | 41796.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 222.92 V (96.92%) | 7.1 V | 367.71 V (159.87%) | 27864.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 133.75 V (58.15%) | 96.3 V | 220.62 V (95.92%) | 16718.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 83.59 V (36.35%) | 146.4 V | 137.89 V (59.95%) | 10449.2 W | Drop High |
| 25 mm² | 101 A | 78 A | 53.5 V (23.26%) | 176.5 V | 88.25 V (38.37%) | 6687.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 38.21 V (16.61%) | 191.8 V | 63.04 V (27.41%) | 4776.8 W | Drop High |
| 50 mm² | 151 A | 118 A | 26.75 V (11.63%) | 203.2 V | 44.12 V (19.18%) | 3343.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 19.11 V (8.31%) | 210.9 V | 31.52 V (13.7%) | 2388.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 14.08 V (6.12%) | 215.9 V | 23.22 V (10.1%) | 1759.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 11.15 V (4.85%) | 218.9 V | 18.39 V (7.99%) | 1393.2 W | ~ ≤5% |
| 150 mm² | 309 A | 241 A | 8.92 V (3.88%) | 221.1 V | 14.71 V (6.39%) | 1114.6 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 7.23 V (3.14%) | 222.8 V | 11.93 V (5.19%) | 903.7 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 5.57 V (2.42%) | 224.4 V | 9.19 V (4.0%) | 696.6 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 4.46 V (1.94%) | 225.5 V | 7.35 V (3.2%) | 557.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 3.34 V (1.45%) | 226.7 V | 5.52 V (2.4%) | 418.0 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 250 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 125A at 250 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 125A over 250m at 230V (voltage drop: 5.57V or 2.42%).
What is the power capacity of 125A at 230V?
At unity power factor, 125A at 230V supports 28.75 kW with a standard 125A circuit breaker.
Related Lengths & Currents (230V)
125A · 5m (230V)125A · 10m (230V)125A · 15m (230V)125A · 20m (230V)125A · 25m (230V)125A · 30m (230V)125A · 35m (230V)125A · 40m (230V)125A · 45m (230V)125A · 50m (230V)125A · 60m (230V)125A · 70m (230V)10A · 250m (230V)16A · 250m (230V)20A · 250m (230V)25A · 250m (230V)32A · 250m (230V)40A · 250m (230V)50A · 250m (230V)63A · 250m (230V)80A · 250m (230V)100A · 250m (230V)160A · 250m (230V)200A · 250m (230V)