125 Amp Cable Size at 100 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 100 m (328.1 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.21V (9.19%)
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 100m
| 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 | 356.67 V (1486.11%) | 0.0 V | 588.33 V (2451.39%) | 44583.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 214.0 V (891.67%) | 0.0 V | 353.0 V (1470.83%) | 26750.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 133.75 V (557.29%) | 0.0 V | 220.62 V (919.27%) | 16718.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 89.17 V (371.53%) | 0.0 V | 147.08 V (612.85%) | 11145.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 53.5 V (222.92%) | 0.0 V | 88.25 V (367.71%) | 6687.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 33.44 V (139.32%) | 0.0 V | 55.16 V (229.82%) | 4179.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 21.4 V (89.17%) | 2.6 V | 35.3 V (147.08%) | 2675.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 15.29 V (63.69%) | 8.7 V | 25.21 V (105.06%) | 1910.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 1337.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 7.64 V (31.85%) | 16.4 V | 12.61 V (52.53%) | 955.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 5.63 V (23.46%) | 18.4 V | 9.29 V (38.71%) | 703.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.46 V (18.58%) | 19.5 V | 7.35 V (30.64%) | 557.3 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.57 V (14.86%) | 20.4 V | 5.88 V (24.51%) | 445.8 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.89 V (12.05%) | 21.1 V | 4.77 V (19.88%) | 361.5 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.23 V (9.29%) | 21.8 V | 3.68 V (15.32%) | 278.6 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.78 V (7.43%) | 22.2 V | 2.94 V (12.26%) | 222.9 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.34 V (5.57%) | 22.7 V | 2.21 V (9.19%) | 167.2 W | Drop High |
FAQ — 125 Amp Cable Size at 100 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 125A at 100 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 125A over 100m 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 · 100m (24V)16A · 100m (24V)20A · 100m (24V)25A · 100m (24V)32A · 100m (24V)40A · 100m (24V)50A · 100m (24V)63A · 100m (24V)80A · 100m (24V)100A · 100m (24V)160A · 100m (24V)200A · 100m (24V)