325 Amp Cable Size at 70 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 70 m (229.7 ft).
Copper Cable (≤3% Drop)4× 400 mm²Drop: 0.61V (2.54%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 4.02V (16.73%)
Voltage at Load23.4 VLine Loss: 197.8 W
Max Power & Breaker7.8 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 70m
| 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 | 649.13 V (2704.72%) | 0.0 V | 1070.77 V (4461.53%) | 210968.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 389.48 V (1622.83%) | 0.0 V | 642.46 V (2676.92%) | 126581.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 243.43 V (1014.27%) | 0.0 V | 401.54 V (1673.07%) | 79113.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 162.28 V (676.18%) | 0.0 V | 267.69 V (1115.38%) | 52742.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 97.37 V (405.71%) | 0.0 V | 160.62 V (669.23%) | 31645.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 60.86 V (253.57%) | 0.0 V | 100.38 V (418.27%) | 19778.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 38.95 V (162.28%) | 0.0 V | 64.25 V (267.69%) | 12658.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 27.82 V (115.92%) | 0.0 V | 45.89 V (191.21%) | 9041.5 W | Drop High |
| 50 mm² | 151 A | 118 A | 19.47 V (81.14%) | 4.5 V | 32.12 V (133.85%) | 6329.1 W | Drop High |
| 70 mm² | 192 A | 150 A | 13.91 V (57.96%) | 10.1 V | 22.95 V (95.6%) | 4520.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 10.25 V (42.71%) | 13.8 V | 16.91 V (70.45%) | 3331.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 8.11 V (33.81%) | 15.9 V | 13.38 V (55.77%) | 2637.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 6.49 V (27.05%) | 17.5 V | 10.71 V (44.62%) | 2109.7 W | Drop High |
| 185 mm² | 353 A | 275 A | 5.26 V (21.93%) | 18.7 V | 8.68 V (36.17%) | 1710.6 W | Drop High |
| 240 mm² | 415 A | 324 A | 4.06 V (16.9%) | 19.9 V | 6.69 V (27.88%) | 1318.6 W | Drop High |
| 300 mm² | 477 A | 372 A | 3.25 V (13.52%) | 20.8 V | 5.35 V (22.31%) | 1054.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 2.43 V (10.14%) | 21.6 V | 4.02 V (16.73%) | 791.1 W | Drop High |
FAQ — 325 Amp Cable Size at 70 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 325A at 70 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4× 400 mm² copper cable for 325A over 70m at 24V (voltage drop: 0.61V or 2.54%).
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)10A · 70m (24V)16A · 70m (24V)20A · 70m (24V)25A · 70m (24V)32A · 70m (24V)40A · 70m (24V)50A · 70m (24V)63A · 70m (24V)80A · 70m (24V)100A · 70m (24V)125A · 70m (24V)160A · 70m (24V)200A · 70m (24V)