45 Amp Cable Size at 120 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 45 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 8.01V (1.93%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 9.43V (2.27%)
Voltage at Load407.0 VLine Loss: 624.0 W
Max Power & Breaker32.35 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A at 120m
| 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 | 133.44 V (32.15%) | 281.6 V | 220.11 V (53.04%) | 10400.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 80.06 V (19.29%) | 334.9 V | 132.07 V (31.82%) | 6240.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 50.04 V (12.06%) | 365.0 V | 82.54 V (19.89%) | 3900.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 33.36 V (8.04%) | 381.6 V | 55.03 V (13.26%) | 2600.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 20.02 V (4.82%) | 395.0 V | 33.02 V (7.96%) | 1560.1 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 12.51 V (3.01%) | 402.5 V | 20.64 V (4.97%) | 975.0 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 8.01 V (1.93%) | 407.0 V | 13.21 V (3.18%) | 624.0 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 5.72 V (1.38%) | 409.3 V | 9.43 V (2.27%) | 445.7 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 4.0 V (0.96%) | 411.0 V | 6.6 V (1.59%) | 312.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 2.86 V (0.69%) | 412.1 V | 4.72 V (1.14%) | 222.9 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.11 V (0.51%) | 412.9 V | 3.48 V (0.84%) | 164.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.67 V (0.4%) | 413.3 V | 2.75 V (0.66%) | 130.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.33 V (0.32%) | 413.7 V | 2.2 V (0.53%) | 104.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.08 V (0.26%) | 413.9 V | 1.78 V (0.43%) | 84.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.83 V (0.2%) | 414.2 V | 1.38 V (0.33%) | 65.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.67 V (0.16%) | 414.3 V | 1.1 V (0.27%) | 52.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.5 V (0.12%) | 414.5 V | 0.83 V (0.2%) | 39.0 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 120 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 45A at 120 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 45A over 120m at 415V (voltage drop: 8.01V or 1.93%).
What is the power capacity of 45A at 415V?
At unity power factor, 45A at 415V supports 32.35 kW with a standard 45A circuit breaker.
Related Lengths & Currents (415V)
45A · 5m (415V)45A · 10m (415V)45A · 15m (415V)45A · 20m (415V)45A · 25m (415V)45A · 30m (415V)45A · 35m (415V)45A · 40m (415V)45A · 45m (415V)45A · 50m (415V)45A · 60m (415V)45A · 70m (415V)10A · 120m (415V)16A · 120m (415V)20A · 120m (415V)25A · 120m (415V)32A · 120m (415V)40A · 120m (415V)50A · 120m (415V)63A · 120m (415V)80A · 120m (415V)100A · 120m (415V)125A · 120m (415V)160A · 120m (415V)200A · 120m (415V)