450 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 450 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 1.11V (0.28%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.38V (0.34%)
Voltage at Load398.9 VLine Loss: 866.7 W
Max Power & Breaker311.77 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 450A 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 | 222.4 V (55.6%) | 177.6 V | 366.85 V (91.71%) | 173340.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 133.44 V (33.36%) | 266.6 V | 220.11 V (55.03%) | 104004.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 83.4 V (20.85%) | 316.6 V | 137.57 V (34.39%) | 65002.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 55.6 V (13.9%) | 344.4 V | 91.71 V (22.93%) | 43335.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 33.36 V (8.34%) | 366.6 V | 55.03 V (13.76%) | 26001.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 20.85 V (5.21%) | 379.2 V | 34.39 V (8.6%) | 16250.6 W | Drop High |
| 25 mm² | 101 A | 78 A | 13.34 V (3.34%) | 386.7 V | 22.01 V (5.5%) | 10400.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 9.53 V (2.38%) | 390.5 V | 15.72 V (3.93%) | 7428.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 6.67 V (1.67%) | 393.3 V | 11.01 V (2.75%) | 5200.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 4.77 V (1.19%) | 395.2 V | 7.86 V (1.97%) | 3714.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.51 V (0.88%) | 396.5 V | 5.79 V (1.45%) | 2736.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.78 V (0.69%) | 397.2 V | 4.59 V (1.15%) | 2166.8 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.22 V (0.56%) | 397.8 V | 3.67 V (0.92%) | 1733.4 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.8 V (0.45%) | 398.2 V | 2.97 V (0.74%) | 1405.5 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.39 V (0.35%) | 398.6 V | 2.29 V (0.57%) | 1083.4 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.11 V (0.28%) | 398.9 V | 1.83 V (0.46%) | 866.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.83 V (0.21%) | 399.2 V | 1.38 V (0.34%) | 650.0 W | ✓ OK (≤3%) |
FAQ — 450 Amp Cable Size at 20 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 450A at 20 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 450A over 20m at 400V (voltage drop: 1.11V or 0.28%).
What is the power capacity of 450A at 400V?
At unity power factor, 450A at 400V supports 311.77 kW with a standard 450A circuit breaker.
Related Lengths & Currents (400V)
450A · 5m (400V)450A · 10m (400V)450A · 15m (400V)450A · 25m (400V)450A · 30m (400V)450A · 35m (400V)450A · 40m (400V)450A · 45m (400V)450A · 50m (400V)450A · 60m (400V)450A · 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)