125 Amp Cable Size at 45 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 45 m (147.6 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 6.88V (2.99%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 5.67V (2.47%)
Voltage at Load223.1 VLine Loss: 859.8 W
Max Power & Breaker28.75 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 45m
| 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 | 160.5 V (69.78%) | 69.5 V | 264.75 V (115.11%) | 20062.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 96.3 V (41.87%) | 133.7 V | 158.85 V (69.07%) | 12037.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 60.19 V (26.17%) | 169.8 V | 99.28 V (43.17%) | 7523.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 40.12 V (17.45%) | 189.9 V | 66.19 V (28.78%) | 5015.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 24.07 V (10.47%) | 205.9 V | 39.71 V (17.27%) | 3009.4 W | Drop High |
| 16 mm² | 76 A | 59 A | 15.05 V (6.54%) | 215.0 V | 24.82 V (10.79%) | 1880.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 9.63 V (4.19%) | 220.4 V | 15.88 V (6.91%) | 1203.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 6.88 V (2.99%) | 223.1 V | 11.35 V (4.93%) | 859.8 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 4.81 V (2.09%) | 225.2 V | 7.94 V (3.45%) | 601.9 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.44 V (1.5%) | 226.6 V | 5.67 V (2.47%) | 429.9 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.53 V (1.1%) | 227.5 V | 4.18 V (1.82%) | 316.8 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 2.01 V (0.87%) | 228.0 V | 3.31 V (1.44%) | 250.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.6 V (0.7%) | 228.4 V | 2.65 V (1.15%) | 200.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.3 V (0.57%) | 228.7 V | 2.15 V (0.93%) | 162.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.0 V (0.44%) | 229.0 V | 1.65 V (0.72%) | 125.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.8 V (0.35%) | 229.2 V | 1.32 V (0.58%) | 100.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.6 V (0.26%) | 229.4 V | 0.99 V (0.43%) | 75.2 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 45 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 125A at 45 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 45m at 230V (voltage drop: 6.88V or 2.99%).
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 · 50m (230V)125A · 60m (230V)125A · 70m (230V)10A · 45m (230V)16A · 45m (230V)20A · 45m (230V)25A · 45m (230V)32A · 45m (230V)40A · 45m (230V)50A · 45m (230V)63A · 45m (230V)80A · 45m (230V)100A · 45m (230V)160A · 45m (230V)200A · 45m (230V)