125 Amp Cable Size at 50 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 50 m (164.0 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 5.35V (2.33%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 6.3V (2.74%)
Voltage at Load224.7 VLine Loss: 668.7 W
Max Power & Breaker28.75 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 50m
| 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 | 178.33 V (77.54%) | 51.7 V | 294.17 V (127.9%) | 22291.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 107.0 V (46.52%) | 123.0 V | 176.5 V (76.74%) | 13375.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 66.87 V (29.08%) | 163.1 V | 110.31 V (47.96%) | 8359.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 44.58 V (19.38%) | 185.4 V | 73.54 V (31.97%) | 5572.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 26.75 V (11.63%) | 203.2 V | 44.12 V (19.18%) | 3343.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 16.72 V (7.27%) | 213.3 V | 27.58 V (11.99%) | 2089.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 10.7 V (4.65%) | 219.3 V | 17.65 V (7.67%) | 1337.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 7.64 V (3.32%) | 222.4 V | 12.61 V (5.48%) | 955.4 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 5.35 V (2.33%) | 224.7 V | 8.82 V (3.84%) | 668.7 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.82 V (1.66%) | 226.2 V | 6.3 V (2.74%) | 477.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.82 V (1.22%) | 227.2 V | 4.64 V (2.02%) | 352.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 2.23 V (0.97%) | 227.8 V | 3.68 V (1.6%) | 278.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.78 V (0.78%) | 228.2 V | 2.94 V (1.28%) | 222.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.45 V (0.63%) | 228.6 V | 2.39 V (1.04%) | 180.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.11 V (0.48%) | 228.9 V | 1.84 V (0.8%) | 139.3 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.89 V (0.39%) | 229.1 V | 1.47 V (0.64%) | 111.5 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.67 V (0.29%) | 229.3 V | 1.1 V (0.48%) | 83.6 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 50 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 125A at 50 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 125A over 50m at 230V (voltage drop: 5.35V or 2.33%).
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 · 60m (230V)125A · 70m (230V)10A · 50m (230V)16A · 50m (230V)20A · 50m (230V)25A · 50m (230V)32A · 50m (230V)40A · 50m (230V)50A · 50m (230V)63A · 50m (230V)80A · 50m (230V)100A · 50m (230V)160A · 50m (230V)200A · 50m (230V)