25 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 25 A over 40 m (131.2 ft).
Copper Cable (≤3% Drop)10 mm²Drop: 4.28V (1.86%)
Aluminum Cable (≤3% Drop)16 mm²Drop: 4.41V (1.92%)
Voltage at Load225.7 VLine Loss: 107.0 W
Max Power & Breaker5.75 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A 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 | 28.53 V (12.41%) | 201.5 V | 47.07 V (20.46%) | 713.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 17.12 V (7.44%) | 212.9 V | 28.24 V (12.28%) | 428.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 10.7 V (4.65%) | 219.3 V | 17.65 V (7.67%) | 267.5 W | ~ ≤5% |
| 6 mm² | 41 A | 32 A | 7.13 V (3.1%) | 222.9 V | 11.77 V (5.12%) | 178.3 W | ~ ≤5% |
| 10 mm² | 57 A | 44 A | 4.28 V (1.86%) | 225.7 V | 7.06 V (3.07%) | 107.0 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.67 V (1.16%) | 227.3 V | 4.41 V (1.92%) | 66.9 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.71 V (0.74%) | 228.3 V | 2.82 V (1.23%) | 42.8 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.22 V (0.53%) | 228.8 V | 2.02 V (0.88%) | 30.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.86 V (0.37%) | 229.1 V | 1.41 V (0.61%) | 21.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.61 V (0.27%) | 229.4 V | 1.01 V (0.44%) | 15.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.45 V (0.2%) | 229.5 V | 0.74 V (0.32%) | 11.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.36 V (0.16%) | 229.6 V | 0.59 V (0.26%) | 8.9 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.29 V (0.12%) | 229.7 V | 0.47 V (0.2%) | 7.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.23 V (0.1%) | 229.8 V | 0.38 V (0.17%) | 5.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.18 V (0.08%) | 229.8 V | 0.29 V (0.13%) | 4.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.14 V (0.06%) | 229.9 V | 0.24 V (0.1%) | 3.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.11 V (0.05%) | 229.9 V | 0.18 V (0.08%) | 2.7 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 40 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 25A at 40 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 10 mm² copper cable for 25A over 40m at 230V (voltage drop: 4.28V or 1.86%).
What is the power capacity of 25A at 230V?
At unity power factor, 25A at 230V supports 5.75 kW with a standard 25A circuit breaker.
Related Lengths & Currents (230V)
25A · 5m (230V)25A · 10m (230V)25A · 15m (230V)25A · 20m (230V)25A · 25m (230V)25A · 30m (230V)25A · 35m (230V)25A · 45m (230V)25A · 50m (230V)25A · 60m (230V)25A · 70m (230V)10A · 40m (230V)16A · 40m (230V)20A · 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)