125 Amp Cable Size at 300 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 300 m (984.3 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 6.69V (2.91%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 6.62V (2.88%)
Voltage at Load223.3 VLine Loss: 835.9 W
Max Power & Breaker28.75 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 300m
| 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 | 1070.0 V (465.22%) | 0.0 V | 1765.0 V (767.39%) | 133750.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 642.0 V (279.13%) | 0.0 V | 1059.0 V (460.43%) | 80250.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 401.25 V (174.46%) | 0.0 V | 661.88 V (287.77%) | 50156.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 267.5 V (116.3%) | 0.0 V | 441.25 V (191.85%) | 33437.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 160.5 V (69.78%) | 69.5 V | 264.75 V (115.11%) | 20062.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 100.31 V (43.61%) | 129.7 V | 165.47 V (71.94%) | 12539.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 64.2 V (27.91%) | 165.8 V | 105.9 V (46.04%) | 8025.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 45.86 V (19.94%) | 184.1 V | 75.64 V (32.89%) | 5732.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 32.1 V (13.96%) | 197.9 V | 52.95 V (23.02%) | 4012.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 22.93 V (9.97%) | 207.1 V | 37.82 V (16.44%) | 2866.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 16.89 V (7.35%) | 213.1 V | 27.87 V (12.12%) | 2111.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 13.38 V (5.82%) | 216.6 V | 22.06 V (9.59%) | 1671.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 10.7 V (4.65%) | 219.3 V | 17.65 V (7.67%) | 1337.5 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 8.68 V (3.77%) | 221.3 V | 14.31 V (6.22%) | 1084.5 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 6.69 V (2.91%) | 223.3 V | 11.03 V (4.8%) | 835.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 5.35 V (2.33%) | 224.7 V | 8.82 V (3.84%) | 668.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 4.01 V (1.74%) | 226.0 V | 6.62 V (2.88%) | 501.6 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 300 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 125A at 300 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 300m at 230V (voltage drop: 6.69V or 2.91%).
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 · 300m (230V)16A · 300m (230V)20A · 300m (230V)25A · 300m (230V)32A · 300m (230V)40A · 300m (230V)50A · 300m (230V)63A · 300m (230V)80A · 300m (230V)100A · 300m (230V)160A · 300m (230V)200A · 300m (230V)