20 Amp Cable Size at 40 Meters (230V Single-Phase (IEC Europe / UK / AU))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 20 A over 40 m (131.2 ft).
Copper Cable (≤3% Drop)6 mm²Drop: 5.71V (2.48%)
Aluminum Cable (≤3% Drop)10 mm²Drop: 5.65V (2.46%)
Voltage at Load224.3 VLine Loss: 114.1 W
Max Power & Breaker4.6 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A at 40m
| 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 | 22.83 V (9.92%) | 207.2 V | 37.65 V (16.37%) | 456.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 13.7 V (5.95%) | 216.3 V | 22.59 V (9.82%) | 273.9 W | Drop High |
| 4 mm² | 32 A | 25 A | 8.56 V (3.72%) | 221.4 V | 14.12 V (6.14%) | 171.2 W | ~ ≤5% |
| 6 mm² | 41 A | 32 A | 5.71 V (2.48%) | 224.3 V | 9.41 V (4.09%) | 114.1 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 3.42 V (1.49%) | 226.6 V | 5.65 V (2.46%) | 68.5 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.14 V (0.93%) | 227.9 V | 3.53 V (1.53%) | 42.8 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.37 V (0.6%) | 228.6 V | 2.26 V (0.98%) | 27.4 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.98 V (0.43%) | 229.0 V | 1.61 V (0.7%) | 19.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.68 V (0.3%) | 229.3 V | 1.13 V (0.49%) | 13.7 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.49 V (0.21%) | 229.5 V | 0.81 V (0.35%) | 9.8 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.36 V (0.16%) | 229.6 V | 0.59 V (0.26%) | 7.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.29 V (0.12%) | 229.7 V | 0.47 V (0.2%) | 5.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.23 V (0.1%) | 229.8 V | 0.38 V (0.16%) | 4.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.19 V (0.08%) | 229.8 V | 0.31 V (0.13%) | 3.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.14 V (0.06%) | 229.9 V | 0.24 V (0.1%) | 2.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.11 V (0.05%) | 229.9 V | 0.19 V (0.08%) | 2.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.09 V (0.04%) | 229.9 V | 0.14 V (0.06%) | 1.7 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 40 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 20A at 40 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 6 mm² copper cable for 20A over 40m at 230V (voltage drop: 5.71V or 2.48%).
What is the power capacity of 20A at 230V?
At unity power factor, 20A at 230V supports 4.6 kW with a standard 20A circuit breaker.
Related Lengths & Currents (230V)
20A · 5m (230V)20A · 10m (230V)20A · 15m (230V)20A · 20m (230V)20A · 25m (230V)20A · 30m (230V)20A · 35m (230V)20A · 45m (230V)20A · 50m (230V)20A · 60m (230V)20A · 70m (230V)10A · 40m (230V)16A · 40m (230V)25A · 40m (230V)32A · 40m (230V)40A · 40m (230V)50A · 40m (230V)63A · 40m (230V)80A · 40m (230V)100A · 40m (230V)125A · 40m (230V)160A · 40m (230V)200A · 40m (230V)