400 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 400 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)15× 400 mm²Drop: 0.71V (2.97%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 17.65V (73.54%)
Voltage at Load23.3 VLine Loss: 285.3 W
Max Power & Breaker9.6 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A 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 | 2853.33 V (11888.89%) | 0.0 V | 4706.67 V (19611.11%) | 1141333.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1712.0 V (7133.33%) | 0.0 V | 2824.0 V (11766.67%) | 684800.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 1070.0 V (4458.33%) | 0.0 V | 1765.0 V (7354.17%) | 428000.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 713.33 V (2972.22%) | 0.0 V | 1176.67 V (4902.78%) | 285333.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 428.0 V (1783.33%) | 0.0 V | 706.0 V (2941.67%) | 171200.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 267.5 V (1114.58%) | 0.0 V | 441.25 V (1838.54%) | 107000.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 171.2 V (713.33%) | 0.0 V | 282.4 V (1176.67%) | 68480.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 122.29 V (509.52%) | 0.0 V | 201.71 V (840.48%) | 48914.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 85.6 V (356.67%) | 0.0 V | 141.2 V (588.33%) | 34240.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 61.14 V (254.76%) | 0.0 V | 100.86 V (420.24%) | 24457.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 45.05 V (187.72%) | 0.0 V | 74.32 V (309.65%) | 18021.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 35.67 V (148.61%) | 0.0 V | 58.83 V (245.14%) | 14266.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 28.53 V (118.89%) | 0.0 V | 47.07 V (196.11%) | 11413.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 23.14 V (96.4%) | 0.9 V | 38.16 V (159.01%) | 9254.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 17.83 V (74.31%) | 6.2 V | 29.42 V (122.57%) | 7133.3 W | Drop High |
| 300 mm² | 477 A | 372 A | 14.27 V (59.44%) | 9.7 V | 23.53 V (98.06%) | 5706.7 W | Drop High |
| 400 mm² | 570 A | 445 A | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 4280.0 W | Drop High |
FAQ — 400 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 400A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 15× 400 mm² copper cable for 400A over 250m at 24V (voltage drop: 0.71V or 2.97%).
What is the power capacity of 400A at 24V?
At unity power factor, 400A at 24V supports 9.6 kW with a standard 400A circuit breaker.
Related Lengths & Currents (24V)
400A · 5m (24V)400A · 10m (24V)400A · 15m (24V)400A · 20m (24V)400A · 25m (24V)400A · 30m (24V)400A · 35m (24V)400A · 40m (24V)400A · 45m (24V)400A · 50m (24V)400A · 60m (24V)400A · 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)