40 Amp Cable Size at 350 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 40 A over 350 m (1148.3 ft).
Copper Cable (≤3% Drop)3× 400 mm²Drop: 0.5V (2.08%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.47V (10.3%)
Voltage at Load23.5 VLine Loss: 20.0 W
Max Power & Breaker0.96 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 350m
| 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 | 399.47 V (1664.44%) | 0.0 V | 658.93 V (2745.56%) | 15978.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 239.68 V (998.67%) | 0.0 V | 395.36 V (1647.33%) | 9587.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 149.8 V (624.17%) | 0.0 V | 247.1 V (1029.58%) | 5992.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 99.87 V (416.11%) | 0.0 V | 164.73 V (686.39%) | 3994.7 W | Drop High |
| 10 mm² | 57 A | 44 A | 59.92 V (249.67%) | 0.0 V | 98.84 V (411.83%) | 2396.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 37.45 V (156.04%) | 0.0 V | 61.77 V (257.4%) | 1498.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 23.97 V (99.87%) | 0.0 V | 39.54 V (164.73%) | 958.7 W | Drop High |
| 35 mm² | 125 A | 97 A | 17.12 V (71.33%) | 6.9 V | 28.24 V (117.67%) | 684.8 W | Drop High |
| 50 mm² | 151 A | 118 A | 11.98 V (49.93%) | 12.0 V | 19.77 V (82.37%) | 479.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 8.56 V (35.67%) | 15.4 V | 14.12 V (58.83%) | 342.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 6.31 V (26.28%) | 17.7 V | 10.4 V (43.35%) | 252.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.99 V (20.81%) | 19.0 V | 8.24 V (34.32%) | 199.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.99 V (16.64%) | 20.0 V | 6.59 V (27.46%) | 159.8 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.24 V (13.5%) | 20.8 V | 5.34 V (22.26%) | 129.6 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.5 V (10.4%) | 21.5 V | 4.12 V (17.16%) | 99.9 W | Drop High |
| 300 mm² | 477 A | 372 A | 2.0 V (8.32%) | 22.0 V | 3.29 V (13.73%) | 79.9 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.5 V (6.24%) | 22.5 V | 2.47 V (10.3%) | 59.9 W | Drop High |
FAQ — 40 Amp Cable Size at 350 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 40A at 350 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 3× 400 mm² copper cable for 40A over 350m at 24V (voltage drop: 0.5V or 2.08%).
What is the power capacity of 40A at 24V?
At unity power factor, 40A at 24V supports 0.96 kW with a standard 40A circuit breaker.
Related Lengths & Currents (24V)
40A · 5m (24V)40A · 10m (24V)40A · 15m (24V)40A · 20m (24V)40A · 25m (24V)40A · 30m (24V)40A · 35m (24V)40A · 40m (24V)40A · 45m (24V)40A · 50m (24V)40A · 60m (24V)40A · 70m (24V)10A · 350m (24V)16A · 350m (24V)20A · 350m (24V)25A · 350m (24V)32A · 350m (24V)50A · 350m (24V)63A · 350m (24V)80A · 350m (24V)100A · 350m (24V)125A · 350m (24V)160A · 350m (24V)200A · 350m (24V)