125 Amp Cable Size at 5 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 125 A over 5 m (16.4 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 0.66V (0.16%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 0.55V (0.13%)
Voltage at Load414.3 VLine Loss: 143.3 W
Max Power & Breaker89.85 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 5m
| 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 | 15.44 V (3.72%) | 399.6 V | 25.48 V (6.14%) | 3343.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 9.27 V (2.23%) | 405.7 V | 15.29 V (3.68%) | 2006.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 5.79 V (1.4%) | 409.2 V | 9.55 V (2.3%) | 1253.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 3.86 V (0.93%) | 411.1 V | 6.37 V (1.53%) | 835.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 2.32 V (0.56%) | 412.7 V | 3.82 V (0.92%) | 501.6 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.45 V (0.35%) | 413.6 V | 2.39 V (0.58%) | 313.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 0.93 V (0.22%) | 414.1 V | 1.53 V (0.37%) | 200.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 0.66 V (0.16%) | 414.3 V | 1.09 V (0.26%) | 143.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.46 V (0.11%) | 414.5 V | 0.76 V (0.18%) | 100.3 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.33 V (0.08%) | 414.7 V | 0.55 V (0.13%) | 71.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.24 V (0.06%) | 414.8 V | 0.4 V (0.1%) | 52.8 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.19 V (0.05%) | 414.8 V | 0.32 V (0.08%) | 41.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.15 V (0.04%) | 414.8 V | 0.25 V (0.06%) | 33.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.13 V (0.03%) | 414.9 V | 0.21 V (0.05%) | 27.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.1 V (0.02%) | 414.9 V | 0.16 V (0.04%) | 20.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.08 V (0.02%) | 414.9 V | 0.13 V (0.03%) | 16.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.06 V (0.01%) | 414.9 V | 0.1 V (0.02%) | 12.5 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 5 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 125A at 5 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 125A over 5m at 415V (voltage drop: 0.66V or 0.16%).
What is the power capacity of 125A at 415V?
At unity power factor, 125A at 415V supports 89.85 kW with a standard 125A circuit breaker.
Related Lengths & Currents (415V)
125A · 10m (415V)125A · 15m (415V)125A · 20m (415V)125A · 25m (415V)125A · 30m (415V)125A · 35m (415V)125A · 40m (415V)125A · 45m (415V)125A · 50m (415V)125A · 60m (415V)125A · 70m (415V)10A · 5m (415V)16A · 5m (415V)20A · 5m (415V)25A · 5m (415V)32A · 5m (415V)40A · 5m (415V)50A · 5m (415V)63A · 5m (415V)80A · 5m (415V)100A · 5m (415V)160A · 5m (415V)200A · 5m (415V)