250 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 250 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)10× 400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 11.03V (45.96%)
Voltage at Load23.3 VLine Loss: 167.2 W
Max Power & Breaker6.0 kW250A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 250A 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 | 1783.33 V (7430.56%) | 0.0 V | 2941.67 V (12256.94%) | 445833.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1070.0 V (4458.33%) | 0.0 V | 1765.0 V (7354.17%) | 267500.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 668.75 V (2786.46%) | 0.0 V | 1103.12 V (4596.35%) | 167187.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 445.83 V (1857.64%) | 0.0 V | 735.42 V (3064.24%) | 111458.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 267.5 V (1114.58%) | 0.0 V | 441.25 V (1838.54%) | 66875.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 167.19 V (696.61%) | 0.0 V | 275.78 V (1149.09%) | 41796.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 107.0 V (445.83%) | 0.0 V | 176.5 V (735.42%) | 26750.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 76.43 V (318.45%) | 0.0 V | 126.07 V (525.3%) | 19107.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 53.5 V (222.92%) | 0.0 V | 88.25 V (367.71%) | 13375.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 38.21 V (159.23%) | 0.0 V | 63.04 V (262.65%) | 9553.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 28.16 V (117.32%) | 0.0 V | 46.45 V (193.53%) | 7039.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 22.29 V (92.88%) | 1.7 V | 36.77 V (153.21%) | 5572.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 17.83 V (74.31%) | 6.2 V | 29.42 V (122.57%) | 4458.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 14.46 V (60.25%) | 9.5 V | 23.85 V (99.38%) | 3614.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 11.15 V (46.44%) | 12.9 V | 18.39 V (76.61%) | 2786.5 W | Drop High |
| 300 mm² | 477 A | 372 A | 8.92 V (37.15%) | 15.1 V | 14.71 V (61.28%) | 2229.2 W | Drop High |
| 400 mm² | 570 A | 445 A | 6.69 V (27.86%) | 17.3 V | 11.03 V (45.96%) | 1671.9 W | Drop High |
FAQ — 250 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 250A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 10× 400 mm² copper cable for 250A over 250m at 24V (voltage drop: 0.67V or 2.79%).
What is the power capacity of 250A at 24V?
At unity power factor, 250A at 24V supports 6.0 kW with a standard 250A circuit breaker.
Related Lengths & Currents (24V)
250A · 5m (24V)250A · 10m (24V)250A · 15m (24V)250A · 20m (24V)250A · 25m (24V)250A · 30m (24V)250A · 35m (24V)250A · 40m (24V)250A · 45m (24V)250A · 50m (24V)250A · 60m (24V)250A · 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)