425 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
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)2× 400 mm²Drop: 0.46V (1.9%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.5V (6.25%)
Voltage at Load23.5 VLine Loss: 193.2 W
Max Power & Breaker10.2 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 (1010.56%) | 0.0 V | 400.07 V (1666.94%) | 103076.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 145.52 V (606.33%) | 0.0 V | 240.04 V (1000.17%) | 61846.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 90.95 V (378.96%) | 0.0 V | 150.03 V (625.1%) | 38653.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 60.63 V (252.64%) | 0.0 V | 100.02 V (416.74%) | 25769.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 36.38 V (151.58%) | 0.0 V | 60.01 V (250.04%) | 15461.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 22.74 V (94.74%) | 1.3 V | 37.51 V (156.28%) | 9663.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 14.55 V (60.63%) | 9.4 V | 24.0 V (100.02%) | 6184.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 10.39 V (43.31%) | 13.6 V | 17.15 V (71.44%) | 4417.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 7.28 V (30.32%) | 16.7 V | 12.0 V (50.01%) | 3092.3 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.2 V (21.65%) | 18.8 V | 8.57 V (35.72%) | 2208.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.83 V (15.96%) | 20.2 V | 6.32 V (26.32%) | 1627.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.03 V (12.63%) | 21.0 V | 5.0 V (20.84%) | 1288.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.43 V (10.11%) | 21.6 V | 4.0 V (16.67%) | 1030.8 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.97 V (8.19%) | 22.0 V | 3.24 V (13.52%) | 835.8 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.52 V (6.32%) | 22.5 V | 2.5 V (10.42%) | 644.2 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.21 V (5.05%) | 22.8 V | 2.0 V (8.33%) | 515.4 W | Drop High |
| 400 mm² | 570 A | 445 A | 0.91 V (3.79%) | 23.1 V | 1.5 V (6.25%) | 386.5 W | ~ ≤5% |
FAQ — 425 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 425A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 425A over 20m at 24V (voltage drop: 0.46V or 1.9%).
What is the power capacity of 425A at 24V?
At unity power factor, 425A at 24V supports 10.2 kW with a standard 450A circuit breaker.
Related Lengths & Currents (24V)
425A · 5m (24V)425A · 10m (24V)425A · 15m (24V)425A · 25m (24V)425A · 30m (24V)425A · 35m (24V)425A · 40m (24V)425A · 45m (24V)425A · 50m (24V)425A · 60m (24V)425A · 70m (24V)10A · 20m (24V)16A · 20m (24V)20A · 20m (24V)25A · 20m (24V)32A · 20m (24V)40A · 20m (24V)50A · 20m (24V)63A · 20m (24V)80A · 20m (24V)100A · 20m (24V)125A · 20m (24V)160A · 20m (24V)200A · 20m (24V)