30 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 30 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 5.56V (1.39%)
Aluminum Cable (≤3% Drop)6 mm²Drop: 6.11V (1.53%)
Voltage at Load394.4 VLine Loss: 288.9 W
Max Power & Breaker20.78 kW30A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 30A 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 | 14.83 V (3.71%) | 385.2 V | 24.46 V (6.11%) | 770.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 8.9 V (2.22%) | 391.1 V | 14.67 V (3.67%) | 462.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 5.56 V (1.39%) | 394.4 V | 9.17 V (2.29%) | 288.9 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 3.71 V (0.93%) | 396.3 V | 6.11 V (1.53%) | 192.6 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 2.22 V (0.56%) | 397.8 V | 3.67 V (0.92%) | 115.6 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 1.39 V (0.35%) | 398.6 V | 2.29 V (0.57%) | 72.2 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.89 V (0.22%) | 399.1 V | 1.47 V (0.37%) | 46.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.64 V (0.16%) | 399.4 V | 1.05 V (0.26%) | 33.0 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.44 V (0.11%) | 399.6 V | 0.73 V (0.18%) | 23.1 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.32 V (0.08%) | 399.7 V | 0.52 V (0.13%) | 16.5 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.23 V (0.06%) | 399.8 V | 0.39 V (0.1%) | 12.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.19 V (0.05%) | 399.8 V | 0.31 V (0.08%) | 9.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.15 V (0.04%) | 399.9 V | 0.24 V (0.06%) | 7.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.12 V (0.03%) | 399.9 V | 0.2 V (0.05%) | 6.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.09 V (0.02%) | 399.9 V | 0.15 V (0.04%) | 4.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.07 V (0.02%) | 399.9 V | 0.12 V (0.03%) | 3.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.06 V (0.01%) | 399.9 V | 0.09 V (0.02%) | 2.9 W | ✓ OK (≤3%) |
FAQ — 30 Amp Cable Size at 20 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 30A at 20 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 30A over 20m at 400V (voltage drop: 5.56V or 1.39%).
What is the power capacity of 30A at 400V?
At unity power factor, 30A at 400V supports 20.78 kW with a standard 30A circuit breaker.
Related Lengths & Currents (400V)
30A · 5m (400V)30A · 10m (400V)30A · 15m (400V)30A · 25m (400V)30A · 30m (400V)30A · 35m (400V)30A · 40m (400V)30A · 45m (400V)30A · 50m (400V)30A · 60m (400V)30A · 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)