5 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 5 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)1.5 mm²Drop: 2.47V (0.62%)
Aluminum Cable (≤3% Drop)1.5 mm²Drop: 4.08V (1.02%)
Voltage at Load397.5 VLine Loss: 21.4 W
Max Power & Breaker3.46 kW6A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 5A 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 | 2.47 V (0.62%) | 397.5 V | 4.08 V (1.02%) | 21.4 W | ✓ OK (≤3%) |
| 2.5 mm² | 24 A | 18 A | 1.48 V (0.37%) | 398.5 V | 2.45 V (0.61%) | 12.8 W | ✓ OK (≤3%) |
| 4 mm² | 32 A | 25 A | 0.93 V (0.23%) | 399.1 V | 1.53 V (0.38%) | 8.0 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 0.62 V (0.15%) | 399.4 V | 1.02 V (0.25%) | 5.3 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 0.37 V (0.09%) | 399.6 V | 0.61 V (0.15%) | 3.2 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 0.23 V (0.06%) | 399.8 V | 0.38 V (0.1%) | 2.0 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.15 V (0.04%) | 399.9 V | 0.24 V (0.06%) | 1.3 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.11 V (0.03%) | 399.9 V | 0.17 V (0.04%) | 0.9 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.07 V (0.02%) | 399.9 V | 0.12 V (0.03%) | 0.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.05 V (0.01%) | 399.9 V | 0.09 V (0.02%) | 0.5 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.04 V (0.01%) | 400.0 V | 0.06 V (0.02%) | 0.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.03 V (0.01%) | 400.0 V | 0.05 V (0.01%) | 0.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.02 V (0.01%) | 400.0 V | 0.04 V (0.01%) | 0.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.02 V (0.01%) | 400.0 V | 0.03 V (0.01%) | 0.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.02 V (0.0%) | 400.0 V | 0.03 V (0.01%) | 0.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.01 V (0.0%) | 400.0 V | 0.02 V (0.01%) | 0.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.01 V (0.0%) | 400.0 V | 0.02 V (0.0%) | 0.1 W | ✓ OK (≤3%) |
FAQ — 5 Amp Cable Size at 20 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 5A at 20 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 1.5 mm² copper cable for 5A over 20m at 400V (voltage drop: 2.47V or 0.62%).
What is the power capacity of 5A at 400V?
At unity power factor, 5A at 400V supports 3.46 kW with a standard 6A circuit breaker.
Related Lengths & Currents (400V)
5A · 5m (400V)5A · 10m (400V)5A · 15m (400V)5A · 25m (400V)5A · 30m (400V)5A · 35m (400V)5A · 40m (400V)5A · 45m (400V)5A · 50m (400V)5A · 60m (400V)5A · 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)