425 Amp Cable Size at 20 Meters (230V Single-Phase (IEC Europe / UK / AU))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 425 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 1.21V (0.53%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.5V (0.65%)
Voltage at Load228.8 VLine Loss: 515.4 W
Max Power & Breaker97.75 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 20m
| 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 | 242.53 V (105.45%) | 0.0 V | 400.07 V (173.94%) | 103076.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 145.52 V (63.27%) | 84.5 V | 240.04 V (104.37%) | 61846.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 90.95 V (39.54%) | 139.1 V | 150.03 V (65.23%) | 38653.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 60.63 V (26.36%) | 169.4 V | 100.02 V (43.49%) | 25769.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 36.38 V (15.82%) | 193.6 V | 60.01 V (26.09%) | 15461.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 22.74 V (9.89%) | 207.3 V | 37.51 V (16.31%) | 9663.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 14.55 V (6.33%) | 215.4 V | 24.0 V (10.44%) | 6184.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 10.39 V (4.52%) | 219.6 V | 17.15 V (7.45%) | 4417.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 7.28 V (3.16%) | 222.7 V | 12.0 V (5.22%) | 3092.3 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.2 V (2.26%) | 224.8 V | 8.57 V (3.73%) | 2208.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.83 V (1.66%) | 226.2 V | 6.32 V (2.75%) | 1627.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.03 V (1.32%) | 227.0 V | 5.0 V (2.17%) | 1288.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.43 V (1.05%) | 227.6 V | 4.0 V (1.74%) | 1030.8 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.97 V (0.85%) | 228.0 V | 3.24 V (1.41%) | 835.8 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.52 V (0.66%) | 228.5 V | 2.5 V (1.09%) | 644.2 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.21 V (0.53%) | 228.8 V | 2.0 V (0.87%) | 515.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.91 V (0.4%) | 229.1 V | 1.5 V (0.65%) | 386.5 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 20 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 425A at 20 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 425A over 20m at 230V (voltage drop: 1.21V or 0.53%).
What is the power capacity of 425A at 230V?
At unity power factor, 425A at 230V supports 97.75 kW with a standard 450A circuit breaker.
Related Lengths & Currents (230V)
425A · 5m (230V)425A · 10m (230V)425A · 15m (230V)425A · 25m (230V)425A · 30m (230V)425A · 35m (230V)425A · 40m (230V)425A · 45m (230V)425A · 50m (230V)425A · 60m (230V)425A · 70m (230V)10A · 20m (230V)16A · 20m (230V)20A · 20m (230V)25A · 20m (230V)32A · 20m (230V)40A · 20m (230V)50A · 20m (230V)63A · 20m (230V)80A · 20m (230V)100A · 20m (230V)125A · 20m (230V)160A · 20m (230V)200A · 20m (230V)