125 Amp Cable Size at 100 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 100 m (328.1 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 9.27V (2.23%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 10.92V (2.63%)
Voltage at Load405.7 VLine Loss: 2006.2 W
Max Power & Breaker89.85 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 100m
| 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 | 308.88 V (74.43%) | 106.1 V | 509.51 V (122.77%) | 66875.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 185.33 V (44.66%) | 229.7 V | 305.71 V (73.66%) | 40125.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 115.83 V (27.91%) | 299.2 V | 191.07 V (46.04%) | 25078.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 77.22 V (18.61%) | 337.8 V | 127.38 V (30.69%) | 16718.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 46.33 V (11.16%) | 368.7 V | 76.43 V (18.42%) | 10031.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 28.96 V (6.98%) | 386.0 V | 47.77 V (11.51%) | 6269.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 18.53 V (4.47%) | 396.5 V | 30.57 V (7.37%) | 4012.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 13.24 V (3.19%) | 401.8 V | 21.84 V (5.26%) | 2866.1 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 9.27 V (2.23%) | 405.7 V | 15.29 V (3.68%) | 2006.2 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 6.62 V (1.59%) | 408.4 V | 10.92 V (2.63%) | 1433.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 4.88 V (1.18%) | 410.1 V | 8.04 V (1.94%) | 1055.9 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.86 V (0.93%) | 411.1 V | 6.37 V (1.53%) | 835.9 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 3.09 V (0.74%) | 411.9 V | 5.1 V (1.23%) | 668.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.5 V (0.6%) | 412.5 V | 4.13 V (1.0%) | 542.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.93 V (0.47%) | 413.1 V | 3.18 V (0.77%) | 418.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.54 V (0.37%) | 413.5 V | 2.55 V (0.61%) | 334.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.16 V (0.28%) | 413.8 V | 1.91 V (0.46%) | 250.8 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 100 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 125A at 100 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 125A over 100m at 415V (voltage drop: 9.27V or 2.23%).
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 · 5m (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 · 100m (415V)16A · 100m (415V)20A · 100m (415V)25A · 100m (415V)32A · 100m (415V)40A · 100m (415V)50A · 100m (415V)63A · 100m (415V)80A · 100m (415V)100A · 100m (415V)160A · 100m (415V)200A · 100m (415V)