125 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 125 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)5× 400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 5.52V (22.98%)
Voltage at Load23.3 VLine Loss: 83.6 W
Max Power & Breaker3.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A 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 | 891.67 V (3715.28%) | 0.0 V | 1470.83 V (6128.47%) | 111458.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 535.0 V (2229.17%) | 0.0 V | 882.5 V (3677.08%) | 66875.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 334.38 V (1393.23%) | 0.0 V | 551.56 V (2298.18%) | 41796.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 222.92 V (928.82%) | 0.0 V | 367.71 V (1532.12%) | 27864.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 133.75 V (557.29%) | 0.0 V | 220.62 V (919.27%) | 16718.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 83.59 V (348.31%) | 0.0 V | 137.89 V (574.54%) | 10449.2 W | Drop High |
| 25 mm² | 101 A | 78 A | 53.5 V (222.92%) | 0.0 V | 88.25 V (367.71%) | 6687.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 38.21 V (159.23%) | 0.0 V | 63.04 V (262.65%) | 4776.8 W | Drop High |
| 50 mm² | 151 A | 118 A | 26.75 V (111.46%) | 0.0 V | 44.12 V (183.85%) | 3343.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 19.11 V (79.61%) | 4.9 V | 31.52 V (131.32%) | 2388.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 14.08 V (58.66%) | 9.9 V | 23.22 V (96.77%) | 1759.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 11.15 V (46.44%) | 12.9 V | 18.39 V (76.61%) | 1393.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 8.92 V (37.15%) | 15.1 V | 14.71 V (61.28%) | 1114.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 7.23 V (30.12%) | 16.8 V | 11.93 V (49.69%) | 903.7 W | Drop High |
| 240 mm² | 415 A | 324 A | 5.57 V (23.22%) | 18.4 V | 9.19 V (38.3%) | 696.6 W | Drop High |
| 300 mm² | 477 A | 372 A | 4.46 V (18.58%) | 19.5 V | 7.35 V (30.64%) | 557.3 W | Drop High |
| 400 mm² | 570 A | 445 A | 3.34 V (13.93%) | 20.7 V | 5.52 V (22.98%) | 418.0 W | Drop High |
FAQ — 125 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 125A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 5× 400 mm² copper cable for 125A over 250m at 24V (voltage drop: 0.67V or 2.79%).
What is the power capacity of 125A at 24V?
At unity power factor, 125A at 24V supports 3.0 kW with a standard 125A circuit breaker.
Related Lengths & Currents (24V)
125A · 5m (24V)125A · 10m (24V)125A · 15m (24V)125A · 20m (24V)125A · 25m (24V)125A · 30m (24V)125A · 35m (24V)125A · 40m (24V)125A · 45m (24V)125A · 50m (24V)125A · 60m (24V)125A · 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)160A · 250m (24V)200A · 250m (24V)