425 Amp Cable Size at 120 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 120 m (393.7 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 6.3V (1.52%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 7.8V (1.88%)
Voltage at Load408.7 VLine Loss: 4638.4 W
Max Power & Breaker305.49 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 120m
| 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 | 1260.24 V (303.67%) | 0.0 V | 2078.81 V (500.92%) | 927690.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 756.14 V (182.2%) | 0.0 V | 1247.28 V (300.55%) | 556614.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 472.59 V (113.88%) | 0.0 V | 779.55 V (187.84%) | 347883.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 315.06 V (75.92%) | 99.9 V | 519.7 V (125.23%) | 231922.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 189.04 V (45.55%) | 226.0 V | 311.82 V (75.14%) | 139153.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 118.15 V (28.47%) | 296.9 V | 194.89 V (46.96%) | 86970.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 75.61 V (18.22%) | 339.4 V | 124.73 V (30.06%) | 55661.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 54.01 V (13.01%) | 361.0 V | 89.09 V (21.47%) | 39758.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 37.81 V (9.11%) | 377.2 V | 62.36 V (15.03%) | 27830.7 W | Drop High |
| 70 mm² | 192 A | 150 A | 27.01 V (6.51%) | 388.0 V | 44.55 V (10.73%) | 19879.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 19.9 V (4.79%) | 395.1 V | 32.82 V (7.91%) | 14647.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 15.75 V (3.8%) | 399.2 V | 25.99 V (6.26%) | 11596.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 12.6 V (3.04%) | 402.4 V | 20.79 V (5.01%) | 9276.9 W | Drop High |
| 185 mm² | 353 A | 275 A | 10.22 V (2.46%) | 404.8 V | 16.86 V (4.06%) | 7521.8 W | Drop High |
| 240 mm² | 415 A | 324 A | 7.88 V (1.9%) | 407.1 V | 12.99 V (3.13%) | 5798.1 W | Drop High |
| 300 mm² | 477 A | 372 A | 6.3 V (1.52%) | 408.7 V | 10.39 V (2.5%) | 4638.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 4.73 V (1.14%) | 410.3 V | 7.8 V (1.88%) | 3478.8 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 120 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 425A at 120 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 120m at 415V (voltage drop: 6.3V or 1.52%).
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 · 25m (415V)425A · 30m (415V)425A · 35m (415V)425A · 40m (415V)425A · 45m (415V)425A · 50m (415V)425A · 60m (415V)425A · 70m (415V)10A · 120m (415V)16A · 120m (415V)20A · 120m (415V)25A · 120m (415V)32A · 120m (415V)40A · 120m (415V)50A · 120m (415V)63A · 120m (415V)80A · 120m (415V)100A · 120m (415V)125A · 120m (415V)160A · 120m (415V)200A · 120m (415V)