25 Amp Cable Size at 45 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 25 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 10.42V (2.51%)
Aluminum Cable (≤3% Drop)6 mm²Drop: 11.46V (2.76%)
Voltage at Load404.6 VLine Loss: 451.4 W
Max Power & Breaker17.97 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A 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 | 27.8 V (6.7%) | 387.2 V | 45.86 V (11.05%) | 1203.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 16.68 V (4.02%) | 398.3 V | 27.51 V (6.63%) | 722.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 10.42 V (2.51%) | 404.6 V | 17.2 V (4.14%) | 451.4 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 6.95 V (1.67%) | 408.1 V | 11.46 V (2.76%) | 300.9 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 4.17 V (1.0%) | 410.8 V | 6.88 V (1.66%) | 180.6 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.61 V (0.63%) | 412.4 V | 4.3 V (1.04%) | 112.9 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.67 V (0.4%) | 413.3 V | 2.75 V (0.66%) | 72.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.19 V (0.29%) | 413.8 V | 1.97 V (0.47%) | 51.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.83 V (0.2%) | 414.2 V | 1.38 V (0.33%) | 36.1 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.6 V (0.14%) | 414.4 V | 0.98 V (0.24%) | 25.8 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.44 V (0.11%) | 414.6 V | 0.72 V (0.17%) | 19.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.35 V (0.08%) | 414.7 V | 0.57 V (0.14%) | 15.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.28 V (0.07%) | 414.7 V | 0.46 V (0.11%) | 12.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.23 V (0.05%) | 414.8 V | 0.37 V (0.09%) | 9.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.17 V (0.04%) | 414.8 V | 0.29 V (0.07%) | 7.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.14 V (0.03%) | 414.9 V | 0.23 V (0.06%) | 6.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.1 V (0.03%) | 414.9 V | 0.17 V (0.04%) | 4.5 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 45 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 25A at 45 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 25A over 45m at 415V (voltage drop: 10.42V or 2.51%).
What is the power capacity of 25A at 415V?
At unity power factor, 25A at 415V supports 17.97 kW with a standard 25A circuit breaker.
Related Lengths & Currents (415V)
25A · 5m (415V)25A · 10m (415V)25A · 15m (415V)25A · 20m (415V)25A · 25m (415V)25A · 30m (415V)25A · 35m (415V)25A · 40m (415V)25A · 50m (415V)25A · 60m (415V)25A · 70m (415V)10A · 45m (415V)16A · 45m (415V)20A · 45m (415V)32A · 45m (415V)40A · 45m (415V)50A · 45m (415V)63A · 45m (415V)80A · 45m (415V)100A · 45m (415V)125A · 45m (415V)160A · 45m (415V)200A · 45m (415V)