425 Amp Cable Size at 25 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 425 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 1.31V (0.32%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.62V (0.39%)
Voltage at Load413.7 VLine Loss: 966.3 W
Max Power & Breaker305.49 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A 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 | 262.55 V (63.27%) | 152.4 V | 433.08 V (104.36%) | 193268.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 157.53 V (37.96%) | 257.5 V | 259.85 V (62.61%) | 115961.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 98.46 V (23.72%) | 316.5 V | 162.41 V (39.13%) | 72475.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 65.64 V (15.82%) | 349.4 V | 108.27 V (26.09%) | 48317.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 39.38 V (9.49%) | 375.6 V | 64.96 V (15.65%) | 28990.3 W | Drop High |
| 16 mm² | 76 A | 59 A | 24.61 V (5.93%) | 390.4 V | 40.6 V (9.78%) | 18118.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 15.75 V (3.8%) | 399.2 V | 25.99 V (6.26%) | 11596.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 11.25 V (2.71%) | 403.7 V | 18.56 V (4.47%) | 8282.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 7.88 V (1.9%) | 407.1 V | 12.99 V (3.13%) | 5798.1 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.63 V (1.36%) | 409.4 V | 9.28 V (2.24%) | 4141.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 4.15 V (1.0%) | 410.9 V | 6.84 V (1.65%) | 3051.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.28 V (0.79%) | 411.7 V | 5.41 V (1.3%) | 2415.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.63 V (0.63%) | 412.4 V | 4.33 V (1.04%) | 1932.7 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.13 V (0.51%) | 412.9 V | 3.51 V (0.85%) | 1567.0 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.64 V (0.4%) | 413.4 V | 2.71 V (0.65%) | 1207.9 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.31 V (0.32%) | 413.7 V | 2.17 V (0.52%) | 966.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.98 V (0.24%) | 414.0 V | 1.62 V (0.39%) | 724.8 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 25 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 425A at 25 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 425A over 25m at 415V (voltage drop: 1.31V or 0.32%).
What is the power capacity of 425A at 415V?
At unity power factor, 425A at 415V supports 305.49 kW with a standard 450A circuit breaker.
Related Lengths & Currents (415V)
425A · 5m (415V)425A · 10m (415V)425A · 15m (415V)425A · 20m (415V)425A · 30m (415V)425A · 35m (415V)425A · 40m (415V)425A · 45m (415V)425A · 50m (415V)425A · 60m (415V)425A · 70m (415V)10A · 25m (415V)16A · 25m (415V)20A · 25m (415V)25A · 25m (415V)32A · 25m (415V)40A · 25m (415V)50A · 25m (415V)63A · 25m (415V)80A · 25m (415V)100A · 25m (415V)125A · 25m (415V)160A · 25m (415V)200A · 25m (415V)