125 Amp Cable Size at 120 Meters (400V Three-Phase (IEC European Grid))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 125 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 11.12V (2.78%)
Aluminum Cable (≤3% Drop)95 mm²Drop: 9.65V (2.41%)
Voltage at Load388.9 VLine Loss: 2407.5 W
Max Power & Breaker86.6 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 120m
| 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 | 370.66 V (92.66%) | 29.3 V | 611.41 V (152.85%) | 80250.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 222.4 V (55.6%) | 177.6 V | 366.85 V (91.71%) | 48150.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 139.0 V (34.75%) | 261.0 V | 229.28 V (57.32%) | 30093.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 92.66 V (23.17%) | 307.3 V | 152.85 V (38.21%) | 20062.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 55.6 V (13.9%) | 344.4 V | 91.71 V (22.93%) | 12037.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 34.75 V (8.69%) | 365.3 V | 57.32 V (14.33%) | 7523.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 22.24 V (5.56%) | 377.8 V | 36.68 V (9.17%) | 4815.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 15.89 V (3.97%) | 384.1 V | 26.2 V (6.55%) | 3439.3 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 11.12 V (2.78%) | 388.9 V | 18.34 V (4.59%) | 2407.5 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 7.94 V (1.99%) | 392.1 V | 13.1 V (3.28%) | 1719.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 5.85 V (1.46%) | 394.1 V | 9.65 V (2.41%) | 1267.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 4.63 V (1.16%) | 395.4 V | 7.64 V (1.91%) | 1003.1 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 3.71 V (0.93%) | 396.3 V | 6.11 V (1.53%) | 802.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 3.01 V (0.75%) | 397.0 V | 4.96 V (1.24%) | 650.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 2.32 V (0.58%) | 397.7 V | 3.82 V (0.96%) | 501.6 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.85 V (0.46%) | 398.1 V | 3.06 V (0.76%) | 401.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.39 V (0.35%) | 398.6 V | 2.29 V (0.57%) | 300.9 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 120 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 125A at 120 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 125A over 120m at 400V (voltage drop: 11.12V or 2.78%).
What is the power capacity of 125A at 400V?
At unity power factor, 125A at 400V supports 86.6 kW with a standard 125A circuit breaker.
Related Lengths & Currents (400V)
125A · 5m (400V)125A · 10m (400V)125A · 15m (400V)125A · 20m (400V)125A · 25m (400V)125A · 30m (400V)125A · 35m (400V)125A · 40m (400V)125A · 45m (400V)125A · 50m (400V)125A · 60m (400V)125A · 70m (400V)10A · 120m (400V)16A · 120m (400V)20A · 120m (400V)25A · 120m (400V)32A · 120m (400V)40A · 120m (400V)50A · 120m (400V)63A · 120m (400V)80A · 120m (400V)100A · 120m (400V)160A · 120m (400V)200A · 120m (400V)