45 Amp Cable Size at 20 Meters (400V Three-Phase (IEC European Grid))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 45 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)10 mm²Drop: 3.34V (0.83%)
Aluminum Cable (≤3% Drop)16 mm²Drop: 3.44V (0.86%)
Voltage at Load396.7 VLine Loss: 260.0 W
Max Power & Breaker31.18 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A at 20m
| 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 (5.56%) | 377.8 V | 36.68 V (9.17%) | 1733.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 13.34 V (3.34%) | 386.7 V | 22.01 V (5.5%) | 1040.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 8.34 V (2.08%) | 391.7 V | 13.76 V (3.44%) | 650.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 5.56 V (1.39%) | 394.4 V | 9.17 V (2.29%) | 433.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 3.34 V (0.83%) | 396.7 V | 5.5 V (1.38%) | 260.0 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.08 V (0.52%) | 397.9 V | 3.44 V (0.86%) | 162.5 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.33 V (0.33%) | 398.7 V | 2.2 V (0.55%) | 104.0 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.95 V (0.24%) | 399.0 V | 1.57 V (0.39%) | 74.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.67 V (0.17%) | 399.3 V | 1.1 V (0.28%) | 52.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.48 V (0.12%) | 399.5 V | 0.79 V (0.2%) | 37.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.35 V (0.09%) | 399.6 V | 0.58 V (0.14%) | 27.4 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.28 V (0.07%) | 399.7 V | 0.46 V (0.11%) | 21.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.22 V (0.06%) | 399.8 V | 0.37 V (0.09%) | 17.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.18 V (0.05%) | 399.8 V | 0.3 V (0.07%) | 14.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.14 V (0.03%) | 399.9 V | 0.23 V (0.06%) | 10.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.11 V (0.03%) | 399.9 V | 0.18 V (0.05%) | 8.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.08 V (0.02%) | 399.9 V | 0.14 V (0.03%) | 6.5 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 20 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 45A at 20 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 10 mm² copper cable for 45A over 20m at 400V (voltage drop: 3.34V or 0.83%).
What is the power capacity of 45A at 400V?
At unity power factor, 45A at 400V supports 31.18 kW with a standard 45A circuit breaker.
Related Lengths & Currents (400V)
45A · 5m (400V)45A · 10m (400V)45A · 15m (400V)45A · 25m (400V)45A · 30m (400V)45A · 35m (400V)45A · 40m (400V)45A · 45m (400V)45A · 50m (400V)45A · 60m (400V)45A · 70m (400V)10A · 20m (400V)16A · 20m (400V)20A · 20m (400V)25A · 20m (400V)32A · 20m (400V)40A · 20m (400V)50A · 20m (400V)63A · 20m (400V)80A · 20m (400V)100A · 20m (400V)125A · 20m (400V)160A · 20m (400V)200A · 20m (400V)