325 Amp Cable Size at 40 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 40 m (131.2 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.69V (2.9%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.29V (9.56%)
Voltage at Load23.3 VLine Loss: 226.1 W
Max Power & Breaker7.8 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 40m
| 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 | 370.93 V (1545.56%) | 0.0 V | 611.87 V (2549.44%) | 120553.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 222.56 V (927.33%) | 0.0 V | 367.12 V (1529.67%) | 72332.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 139.1 V (579.58%) | 0.0 V | 229.45 V (956.04%) | 45207.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 92.73 V (386.39%) | 0.0 V | 152.97 V (637.36%) | 30138.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 55.64 V (231.83%) | 0.0 V | 91.78 V (382.42%) | 18083.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 34.77 V (144.9%) | 0.0 V | 57.36 V (239.01%) | 11301.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 22.26 V (92.73%) | 1.7 V | 36.71 V (152.97%) | 7233.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 15.9 V (66.24%) | 8.1 V | 26.22 V (109.26%) | 5166.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 11.13 V (46.37%) | 12.9 V | 18.36 V (76.48%) | 3616.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 7.95 V (33.12%) | 16.1 V | 13.11 V (54.63%) | 2583.3 W | Drop High |
| 95 mm² | 232 A | 181 A | 5.86 V (24.4%) | 18.1 V | 9.66 V (40.25%) | 1903.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.64 V (19.32%) | 19.4 V | 7.65 V (31.87%) | 1506.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.71 V (15.46%) | 20.3 V | 6.12 V (25.49%) | 1205.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.01 V (12.53%) | 21.0 V | 4.96 V (20.67%) | 977.5 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.32 V (9.66%) | 21.7 V | 3.82 V (15.93%) | 753.5 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.85 V (7.73%) | 22.1 V | 3.06 V (12.75%) | 602.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.39 V (5.8%) | 22.6 V | 2.29 V (9.56%) | 452.1 W | Drop High |
FAQ — 325 Amp Cable Size at 40 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 325A at 40 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 325A over 40m at 24V (voltage drop: 0.69V 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 · 45m (24V)325A · 50m (24V)325A · 60m (24V)325A · 70m (24V)10A · 40m (24V)16A · 40m (24V)20A · 40m (24V)25A · 40m (24V)32A · 40m (24V)40A · 40m (24V)50A · 40m (24V)63A · 40m (24V)80A · 40m (24V)100A · 40m (24V)125A · 40m (24V)160A · 40m (24V)200A · 40m (24V)