400 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 400 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)8× 400 mm²Drop: 0.64V (2.67%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 8.47V (35.3%)
Voltage at Load23.4 VLine Loss: 256.8 W
Max Power & Breaker9.6 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A 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 | 1369.6 V (5706.67%) | 0.0 V | 2259.2 V (9413.33%) | 547840.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 821.76 V (3424.0%) | 0.0 V | 1355.52 V (5648.0%) | 328704.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 513.6 V (2140.0%) | 0.0 V | 847.2 V (3530.0%) | 205440.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 342.4 V (1426.67%) | 0.0 V | 564.8 V (2353.33%) | 136960.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 205.44 V (856.0%) | 0.0 V | 338.88 V (1412.0%) | 82176.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 128.4 V (535.0%) | 0.0 V | 211.8 V (882.5%) | 51360.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 82.18 V (342.4%) | 0.0 V | 135.55 V (564.8%) | 32870.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 58.7 V (244.57%) | 0.0 V | 96.82 V (403.43%) | 23478.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 41.09 V (171.2%) | 0.0 V | 67.78 V (282.4%) | 16435.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 29.35 V (122.29%) | 0.0 V | 48.41 V (201.71%) | 11739.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 21.63 V (90.11%) | 2.4 V | 35.67 V (148.63%) | 8650.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 17.12 V (71.33%) | 6.9 V | 28.24 V (117.67%) | 6848.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 13.7 V (57.07%) | 10.3 V | 22.59 V (94.13%) | 5478.4 W | Drop High |
| 185 mm² | 353 A | 275 A | 11.1 V (46.27%) | 12.9 V | 18.32 V (76.32%) | 4441.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 8.56 V (35.67%) | 15.4 V | 14.12 V (58.83%) | 3424.0 W | Drop High |
| 300 mm² | 477 A | 372 A | 6.85 V (28.53%) | 17.2 V | 11.3 V (47.07%) | 2739.2 W | Drop High |
| 400 mm² | 570 A | 445 A | 5.14 V (21.4%) | 18.9 V | 8.47 V (35.3%) | 2054.4 W | Drop High |
FAQ — 400 Amp Cable Size at 120 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 400A at 120 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 8× 400 mm² copper cable for 400A over 120m at 24V (voltage drop: 0.64V or 2.67%).
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 · 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)