750 Amp Cable Size at 120 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 750 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)14× 400 mm²Drop: 0.69V (2.87%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 15.88V (66.19%)
Voltage at Load23.3 VLine Loss: 515.9 W
Max Power & Breaker18.0 kW800A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 750A at 120m
| 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 | 2568.0 V (10700.0%) | 0.0 V | 4236.0 V (17650.0%) | 1926000.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1540.8 V (6420.0%) | 0.0 V | 2541.6 V (10590.0%) | 1155600.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 963.0 V (4012.5%) | 0.0 V | 1588.5 V (6618.75%) | 722250.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 642.0 V (2675.0%) | 0.0 V | 1059.0 V (4412.5%) | 481500.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 385.2 V (1605.0%) | 0.0 V | 635.4 V (2647.5%) | 288900.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 240.75 V (1003.12%) | 0.0 V | 397.12 V (1654.69%) | 180562.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 154.08 V (642.0%) | 0.0 V | 254.16 V (1059.0%) | 115560.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 110.06 V (458.57%) | 0.0 V | 181.54 V (756.43%) | 82542.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 77.04 V (321.0%) | 0.0 V | 127.08 V (529.5%) | 57780.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 55.03 V (229.29%) | 0.0 V | 90.77 V (378.21%) | 41271.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 40.55 V (168.95%) | 0.0 V | 66.88 V (278.68%) | 30410.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 32.1 V (133.75%) | 0.0 V | 52.95 V (220.62%) | 24075.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 25.68 V (107.0%) | 0.0 V | 42.36 V (176.5%) | 19260.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 20.82 V (86.76%) | 3.2 V | 34.35 V (143.11%) | 15616.2 W | Drop High |
| 240 mm² | 415 A | 324 A | 16.05 V (66.88%) | 7.9 V | 26.47 V (110.31%) | 12037.5 W | Drop High |
| 300 mm² | 477 A | 372 A | 12.84 V (53.5%) | 11.2 V | 21.18 V (88.25%) | 9630.0 W | Drop High |
| 400 mm² | 570 A | 445 A | 9.63 V (40.13%) | 14.4 V | 15.88 V (66.19%) | 7222.5 W | Drop High |
FAQ — 750 Amp Cable Size at 120 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 750A at 120 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 14× 400 mm² copper cable for 750A over 120m at 24V (voltage drop: 0.69V or 2.87%).
What is the power capacity of 750A at 24V?
At unity power factor, 750A at 24V supports 18.0 kW with a standard 800A circuit breaker.
Related Lengths & Currents (24V)
750A · 5m (24V)750A · 10m (24V)750A · 15m (24V)750A · 20m (24V)750A · 25m (24V)750A · 30m (24V)750A · 35m (24V)750A · 40m (24V)750A · 45m (24V)750A · 50m (24V)750A · 60m (24V)750A · 70m (24V)10A · 120m (24V)16A · 120m (24V)20A · 120m (24V)25A · 120m (24V)32A · 120m (24V)40A · 120m (24V)50A · 120m (24V)63A · 120m (24V)80A · 120m (24V)100A · 120m (24V)125A · 120m (24V)160A · 120m (24V)200A · 120m (24V)