125 Amp Cable Size at 25 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 25 m (82.0 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 3.82V (1.66%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 3.15V (1.37%)
Voltage at Load226.2 VLine Loss: 477.7 W
Max Power & Breaker28.75 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 25m
| 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 | 89.17 V (38.77%) | 140.8 V | 147.08 V (63.95%) | 11145.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 53.5 V (23.26%) | 176.5 V | 88.25 V (38.37%) | 6687.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 33.44 V (14.54%) | 196.6 V | 55.16 V (23.98%) | 4179.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 22.29 V (9.69%) | 207.7 V | 36.77 V (15.99%) | 2786.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 13.37 V (5.82%) | 216.6 V | 22.06 V (9.59%) | 1671.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 8.36 V (3.63%) | 221.6 V | 13.79 V (6.0%) | 1044.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 5.35 V (2.33%) | 224.7 V | 8.82 V (3.84%) | 668.7 W | Drop High |
| 35 mm² | 125 A | 97 A | 3.82 V (1.66%) | 226.2 V | 6.3 V (2.74%) | 477.7 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 2.67 V (1.16%) | 227.3 V | 4.41 V (1.92%) | 334.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.91 V (0.83%) | 228.1 V | 3.15 V (1.37%) | 238.8 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 1.41 V (0.61%) | 228.6 V | 2.32 V (1.01%) | 176.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.11 V (0.48%) | 228.9 V | 1.84 V (0.8%) | 139.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.89 V (0.39%) | 229.1 V | 1.47 V (0.64%) | 111.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.72 V (0.31%) | 229.3 V | 1.19 V (0.52%) | 90.4 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.56 V (0.24%) | 229.4 V | 0.92 V (0.4%) | 69.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.45 V (0.19%) | 229.6 V | 0.74 V (0.32%) | 55.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.33 V (0.15%) | 229.7 V | 0.55 V (0.24%) | 41.8 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 25 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 125A at 25 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 125A over 25m at 230V (voltage drop: 3.82V or 1.66%).
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 · 30m (230V)125A · 35m (230V)125A · 40m (230V)125A · 45m (230V)125A · 50m (230V)125A · 60m (230V)125A · 70m (230V)10A · 25m (230V)16A · 25m (230V)20A · 25m (230V)25A · 25m (230V)32A · 25m (230V)40A · 25m (230V)50A · 25m (230V)63A · 25m (230V)80A · 25m (230V)100A · 25m (230V)160A · 25m (230V)200A · 25m (230V)