325 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 325 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)13× 400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 14.34V (59.75%)
Voltage at Load23.3 VLine Loss: 217.3 W
Max Power & Breaker7.8 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A 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 | 2318.33 V (9659.72%) | 0.0 V | 3824.17 V (15934.03%) | 753458.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1391.0 V (5795.83%) | 0.0 V | 2294.5 V (9560.42%) | 452075.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 869.37 V (3622.4%) | 0.0 V | 1434.06 V (5975.26%) | 282546.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 579.58 V (2414.93%) | 0.0 V | 956.04 V (3983.51%) | 188364.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 347.75 V (1448.96%) | 0.0 V | 573.62 V (2390.1%) | 113018.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 217.34 V (905.6%) | 0.0 V | 358.52 V (1493.82%) | 70636.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 139.1 V (579.58%) | 0.0 V | 229.45 V (956.04%) | 45207.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 99.36 V (413.99%) | 0.0 V | 163.89 V (682.89%) | 32291.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 69.55 V (289.79%) | 0.0 V | 114.72 V (478.02%) | 22603.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 49.68 V (206.99%) | 0.0 V | 81.95 V (341.44%) | 16145.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 36.61 V (152.52%) | 0.0 V | 60.38 V (251.59%) | 11896.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 28.98 V (120.75%) | 0.0 V | 47.8 V (199.18%) | 9418.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 23.18 V (96.6%) | 0.8 V | 38.24 V (159.34%) | 7534.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 18.8 V (78.32%) | 5.2 V | 31.01 V (129.19%) | 6109.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 14.49 V (60.37%) | 9.5 V | 23.9 V (99.59%) | 4709.1 W | Drop High |
| 300 mm² | 477 A | 372 A | 11.59 V (48.3%) | 12.4 V | 19.12 V (79.67%) | 3767.3 W | Drop High |
| 400 mm² | 570 A | 445 A | 8.69 V (36.22%) | 15.3 V | 14.34 V (59.75%) | 2825.5 W | Drop High |
FAQ — 325 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 325A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 13× 400 mm² copper cable for 325A over 250m at 24V (voltage drop: 0.67V or 2.79%).
What is the power capacity of 325A at 24V?
At unity power factor, 325A at 24V supports 7.8 kW with a standard 350A circuit breaker.
Related Lengths & Currents (24V)
325A · 5m (24V)325A · 10m (24V)325A · 15m (24V)325A · 20m (24V)325A · 25m (24V)325A · 30m (24V)325A · 35m (24V)325A · 40m (24V)325A · 45m (24V)325A · 50m (24V)325A · 60m (24V)325A · 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)