20 Amp Cable Size at 25 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 25 m (82.0 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 5.35V (2.33%)
Aluminum Cable (≤3% Drop)6 mm²Drop: 5.88V (2.56%)
Voltage at Load224.7 VLine Loss: 107.0 W
Max Power & Breaker4.6 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A at 25m
| 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 | 14.27 V (6.2%) | 215.7 V | 23.53 V (10.23%) | 285.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 8.56 V (3.72%) | 221.4 V | 14.12 V (6.14%) | 171.2 W | ~ ≤5% |
| 4 mm² | 32 A | 25 A | 5.35 V (2.33%) | 224.7 V | 8.82 V (3.84%) | 107.0 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 3.57 V (1.55%) | 226.4 V | 5.88 V (2.56%) | 71.3 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 2.14 V (0.93%) | 227.9 V | 3.53 V (1.53%) | 42.8 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 1.34 V (0.58%) | 228.7 V | 2.21 V (0.96%) | 26.7 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.86 V (0.37%) | 229.1 V | 1.41 V (0.61%) | 17.1 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.61 V (0.27%) | 229.4 V | 1.01 V (0.44%) | 12.2 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.43 V (0.19%) | 229.6 V | 0.71 V (0.31%) | 8.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.31 V (0.13%) | 229.7 V | 0.5 V (0.22%) | 6.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.23 V (0.1%) | 229.8 V | 0.37 V (0.16%) | 4.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.18 V (0.08%) | 229.8 V | 0.29 V (0.13%) | 3.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.14 V (0.06%) | 229.9 V | 0.24 V (0.1%) | 2.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.12 V (0.05%) | 229.9 V | 0.19 V (0.08%) | 2.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.09 V (0.04%) | 229.9 V | 0.15 V (0.06%) | 1.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.07 V (0.03%) | 229.9 V | 0.12 V (0.05%) | 1.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.05 V (0.02%) | 229.9 V | 0.09 V (0.04%) | 1.1 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 25 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 20A at 25 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 20A over 25m at 230V (voltage drop: 5.35V or 2.33%).
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 · 30m (230V)20A · 35m (230V)20A · 40m (230V)20A · 45m (230V)20A · 50m (230V)20A · 60m (230V)20A · 70m (230V)10A · 25m (230V)16A · 25m (230V)25A · 25m (230V)32A · 25m (230V)40A · 25m (230V)50A · 25m (230V)63A · 25m (230V)80A · 25m (230V)100A · 25m (230V)125A · 25m (230V)160A · 25m (230V)200A · 25m (230V)