325 Amp Cable Size at 400 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 400 m (1312.3 ft).
Copper Cable (≤3% Drop)20× 400 mm²Drop: 0.7V (2.9%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 22.95V (95.6%)
Voltage at Load23.3 VLine Loss: 226.0 W
Max Power & Breaker7.8 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 400m
| 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 | 3709.33 V (15455.56%) | 0.0 V | 6118.67 V (25494.44%) | 1205533.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 2225.6 V (9273.33%) | 0.0 V | 3671.2 V (15296.67%) | 723320.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 1391.0 V (5795.83%) | 0.0 V | 2294.5 V (9560.42%) | 452075.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 927.33 V (3863.89%) | 0.0 V | 1529.67 V (6373.61%) | 301383.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 556.4 V (2318.33%) | 0.0 V | 917.8 V (3824.17%) | 180830.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 347.75 V (1448.96%) | 0.0 V | 573.62 V (2390.1%) | 113018.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 222.56 V (927.33%) | 0.0 V | 367.12 V (1529.67%) | 72332.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 158.97 V (662.38%) | 0.0 V | 262.23 V (1092.62%) | 51665.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 111.28 V (463.67%) | 0.0 V | 183.56 V (764.83%) | 36166.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 79.49 V (331.19%) | 0.0 V | 131.11 V (546.31%) | 25832.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 58.57 V (244.04%) | 0.0 V | 96.61 V (402.54%) | 19034.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 46.37 V (193.19%) | 0.0 V | 76.48 V (318.68%) | 15069.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 37.09 V (154.56%) | 0.0 V | 61.19 V (254.94%) | 12055.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 30.08 V (125.32%) | 0.0 V | 49.61 V (206.71%) | 9774.6 W | Drop High |
| 240 mm² | 415 A | 324 A | 23.18 V (96.6%) | 0.8 V | 38.24 V (159.34%) | 7534.6 W | Drop High |
| 300 mm² | 477 A | 372 A | 18.55 V (77.28%) | 5.5 V | 30.59 V (127.47%) | 6027.7 W | Drop High |
| 400 mm² | 570 A | 445 A | 13.91 V (57.96%) | 10.1 V | 22.95 V (95.6%) | 4520.7 W | Drop High |
FAQ — 325 Amp Cable Size at 400 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 325A at 400 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 20× 400 mm² copper cable for 325A over 400m at 24V (voltage drop: 0.7V or 2.9%).
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 · 400m (24V)16A · 400m (24V)20A · 400m (24V)25A · 400m (24V)32A · 400m (24V)40A · 400m (24V)50A · 400m (24V)63A · 400m (24V)80A · 400m (24V)100A · 400m (24V)125A · 400m (24V)160A · 400m (24V)200A · 400m (24V)