20 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 20 A over 45 m (147.6 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 8.34V (2.01%)
Aluminum Cable (≤3% Drop)6 mm²Drop: 9.17V (2.21%)
Voltage at Load406.7 VLine Loss: 288.9 W
Max Power & Breaker14.38 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A 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 | 22.24 V (5.36%) | 392.8 V | 36.68 V (8.84%) | 770.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 13.34 V (3.22%) | 401.7 V | 22.01 V (5.3%) | 462.2 W | ~ ≤5% |
| 4 mm² | 32 A | 25 A | 8.34 V (2.01%) | 406.7 V | 13.76 V (3.31%) | 288.9 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 5.56 V (1.34%) | 409.4 V | 9.17 V (2.21%) | 192.6 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 3.34 V (0.8%) | 411.7 V | 5.5 V (1.33%) | 115.6 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.08 V (0.5%) | 412.9 V | 3.44 V (0.83%) | 72.2 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.33 V (0.32%) | 413.7 V | 2.2 V (0.53%) | 46.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.95 V (0.23%) | 414.0 V | 1.57 V (0.38%) | 33.0 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.67 V (0.16%) | 414.3 V | 1.1 V (0.27%) | 23.1 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.48 V (0.11%) | 414.5 V | 0.79 V (0.19%) | 16.5 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.35 V (0.08%) | 414.6 V | 0.58 V (0.14%) | 12.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.28 V (0.07%) | 414.7 V | 0.46 V (0.11%) | 9.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.22 V (0.05%) | 414.8 V | 0.37 V (0.09%) | 7.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.18 V (0.04%) | 414.8 V | 0.3 V (0.07%) | 6.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.14 V (0.03%) | 414.9 V | 0.23 V (0.06%) | 4.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.11 V (0.03%) | 414.9 V | 0.18 V (0.04%) | 3.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.08 V (0.02%) | 414.9 V | 0.14 V (0.03%) | 2.9 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 45 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 20A 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 20A over 45m at 415V (voltage drop: 8.34V or 2.01%).
What is the power capacity of 20A at 415V?
At unity power factor, 20A at 415V supports 14.38 kW with a standard 20A circuit breaker.
Related Lengths & Currents (415V)
20A · 5m (415V)20A · 10m (415V)20A · 15m (415V)20A · 20m (415V)20A · 25m (415V)20A · 30m (415V)20A · 35m (415V)20A · 40m (415V)20A · 50m (415V)20A · 60m (415V)20A · 70m (415V)10A · 45m (415V)16A · 45m (415V)25A · 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)