350 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 350 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)14× 400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 15.44V (64.35%)
Voltage at Load23.3 VLine Loss: 234.1 W
Max Power & Breaker8.4 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 350A 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 | 2496.67 V (10402.78%) | 0.0 V | 4118.33 V (17159.72%) | 873833.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1498.0 V (6241.67%) | 0.0 V | 2471.0 V (10295.83%) | 524300.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 936.25 V (3901.04%) | 0.0 V | 1544.37 V (6434.9%) | 327687.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 624.17 V (2600.69%) | 0.0 V | 1029.58 V (4289.93%) | 218458.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 374.5 V (1560.42%) | 0.0 V | 617.75 V (2573.96%) | 131075.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 234.06 V (975.26%) | 0.0 V | 386.09 V (1608.72%) | 81921.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 149.8 V (624.17%) | 0.0 V | 247.1 V (1029.58%) | 52430.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 107.0 V (445.83%) | 0.0 V | 176.5 V (735.42%) | 37450.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 74.9 V (312.08%) | 0.0 V | 123.55 V (514.79%) | 26215.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 53.5 V (222.92%) | 0.0 V | 88.25 V (367.71%) | 18725.0 W | Drop High |
| 95 mm² | 232 A | 181 A | 39.42 V (164.25%) | 0.0 V | 65.03 V (270.94%) | 13797.4 W | Drop High |
| 120 mm² | 269 A | 210 A | 31.21 V (130.03%) | 0.0 V | 51.48 V (214.5%) | 10922.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 24.97 V (104.03%) | 0.0 V | 41.18 V (171.6%) | 8738.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 20.24 V (84.35%) | 3.8 V | 33.39 V (139.13%) | 7085.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 15.6 V (65.02%) | 8.4 V | 25.74 V (107.25%) | 5461.5 W | Drop High |
| 300 mm² | 477 A | 372 A | 12.48 V (52.01%) | 11.5 V | 20.59 V (85.8%) | 4369.2 W | Drop High |
| 400 mm² | 570 A | 445 A | 9.36 V (39.01%) | 14.6 V | 15.44 V (64.35%) | 3276.9 W | Drop High |
FAQ — 350 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 350A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 14× 400 mm² copper cable for 350A over 250m at 24V (voltage drop: 0.67V or 2.79%).
What is the power capacity of 350A at 24V?
At unity power factor, 350A at 24V supports 8.4 kW with a standard 350A circuit breaker.
Related Lengths & Currents (24V)
350A · 5m (24V)350A · 10m (24V)350A · 15m (24V)350A · 20m (24V)350A · 25m (24V)350A · 30m (24V)350A · 35m (24V)350A · 40m (24V)350A · 45m (24V)350A · 50m (24V)350A · 60m (24V)350A · 70m (24V)10A · 250m (24V)16A · 250m (24V)20A · 250m (24V)25A · 250m (24V)32A · 250m (24V)40A · 250m (24V)50A · 250m (24V)63A · 250m (24V)80A · 250m (24V)100A · 250m (24V)125A · 250m (24V)160A · 250m (24V)200A · 250m (24V)