125 Amp Cable Size at 15 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 15 m (49.2 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 2.29V (1.0%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 1.89V (0.82%)
Voltage at Load227.7 VLine Loss: 286.6 W
Max Power & Breaker28.75 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 15m
| 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 | 53.5 V (23.26%) | 176.5 V | 88.25 V (38.37%) | 6687.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 32.1 V (13.96%) | 197.9 V | 52.95 V (23.02%) | 4012.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 20.06 V (8.72%) | 209.9 V | 33.09 V (14.39%) | 2507.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 13.38 V (5.82%) | 216.6 V | 22.06 V (9.59%) | 1671.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 8.03 V (3.49%) | 222.0 V | 13.24 V (5.76%) | 1003.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 5.02 V (2.18%) | 225.0 V | 8.27 V (3.6%) | 627.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.21 V (1.4%) | 226.8 V | 5.29 V (2.3%) | 401.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 2.29 V (1.0%) | 227.7 V | 3.78 V (1.64%) | 286.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.6 V (0.7%) | 228.4 V | 2.65 V (1.15%) | 200.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.15 V (0.5%) | 228.9 V | 1.89 V (0.82%) | 143.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.84 V (0.37%) | 229.2 V | 1.39 V (0.61%) | 105.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.67 V (0.29%) | 229.3 V | 1.1 V (0.48%) | 83.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.54 V (0.23%) | 229.5 V | 0.88 V (0.38%) | 66.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.43 V (0.19%) | 229.6 V | 0.72 V (0.31%) | 54.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.33 V (0.15%) | 229.7 V | 0.55 V (0.24%) | 41.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.27 V (0.12%) | 229.7 V | 0.44 V (0.19%) | 33.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.2 V (0.09%) | 229.8 V | 0.33 V (0.14%) | 25.1 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 15 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 125A at 15 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 15m at 230V (voltage drop: 2.29V or 1.0%).
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 · 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 · 15m (230V)16A · 15m (230V)20A · 15m (230V)25A · 15m (230V)32A · 15m (230V)40A · 15m (230V)50A · 15m (230V)63A · 15m (230V)80A · 15m (230V)100A · 15m (230V)160A · 15m (230V)200A · 15m (230V)