25 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 25 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 9.27V (2.23%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 10.92V (2.63%)
Voltage at Load405.7 VLine Loss: 401.2 W
Max Power & Breaker17.97 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A at 250m
| 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 | 154.44 V (37.21%) | 260.6 V | 254.76 V (61.39%) | 6687.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 92.66 V (22.33%) | 322.3 V | 152.85 V (36.83%) | 4012.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 57.92 V (13.96%) | 357.1 V | 95.53 V (23.02%) | 2507.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 38.61 V (9.3%) | 376.4 V | 63.69 V (15.35%) | 1671.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 23.17 V (5.58%) | 391.8 V | 38.21 V (9.21%) | 1003.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 14.48 V (3.49%) | 400.5 V | 23.88 V (5.76%) | 627.0 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 9.27 V (2.23%) | 405.7 V | 15.29 V (3.68%) | 401.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 6.62 V (1.59%) | 408.4 V | 10.92 V (2.63%) | 286.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 4.63 V (1.12%) | 410.4 V | 7.64 V (1.84%) | 200.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.31 V (0.8%) | 411.7 V | 5.46 V (1.32%) | 143.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.44 V (0.59%) | 412.6 V | 4.02 V (0.97%) | 105.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.93 V (0.47%) | 413.1 V | 3.18 V (0.77%) | 83.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.54 V (0.37%) | 413.5 V | 2.55 V (0.61%) | 66.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.25 V (0.3%) | 413.7 V | 2.07 V (0.5%) | 54.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.97 V (0.23%) | 414.0 V | 1.59 V (0.38%) | 41.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.77 V (0.19%) | 414.2 V | 1.27 V (0.31%) | 33.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.58 V (0.14%) | 414.4 V | 0.96 V (0.23%) | 25.1 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 25A at 250 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 25A over 250m at 415V (voltage drop: 9.27V or 2.23%).
What is the power capacity of 25A at 415V?
At unity power factor, 25A at 415V supports 17.97 kW with a standard 25A circuit breaker.
Related Lengths & Currents (415V)
25A · 5m (415V)25A · 10m (415V)25A · 15m (415V)25A · 20m (415V)25A · 25m (415V)25A · 30m (415V)25A · 35m (415V)25A · 40m (415V)25A · 45m (415V)25A · 50m (415V)25A · 60m (415V)25A · 70m (415V)10A · 250m (415V)16A · 250m (415V)20A · 250m (415V)32A · 250m (415V)40A · 250m (415V)50A · 250m (415V)63A · 250m (415V)80A · 250m (415V)100A · 250m (415V)125A · 250m (415V)160A · 250m (415V)200A · 250m (415V)