90 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 90 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.58V (2.4%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.91V (7.94%)
Voltage at Load23.4 VLine Loss: 52.0 W
Max Power & Breaker2.16 kW90A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 90A 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 | 308.16 V (1284.0%) | 0.0 V | 508.32 V (2118.0%) | 27734.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 184.9 V (770.4%) | 0.0 V | 304.99 V (1270.8%) | 16640.6 W | Drop High |
| 4 mm² | 32 A | 25 A | 115.56 V (481.5%) | 0.0 V | 190.62 V (794.25%) | 10400.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 77.04 V (321.0%) | 0.0 V | 127.08 V (529.5%) | 6933.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 46.22 V (192.6%) | 0.0 V | 76.25 V (317.7%) | 4160.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 28.89 V (120.38%) | 0.0 V | 47.65 V (198.56%) | 2600.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 18.49 V (77.04%) | 5.5 V | 30.5 V (127.08%) | 1664.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 13.21 V (55.03%) | 10.8 V | 21.79 V (90.77%) | 1188.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 9.24 V (38.52%) | 14.8 V | 15.25 V (63.54%) | 832.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 6.6 V (27.51%) | 17.4 V | 10.89 V (45.39%) | 594.3 W | Drop High |
| 95 mm² | 232 A | 181 A | 4.87 V (20.27%) | 19.1 V | 8.03 V (33.44%) | 437.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.85 V (16.05%) | 20.1 V | 6.35 V (26.47%) | 346.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.08 V (12.84%) | 20.9 V | 5.08 V (21.18%) | 277.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.5 V (10.41%) | 21.5 V | 4.12 V (17.17%) | 224.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.93 V (8.03%) | 22.1 V | 3.18 V (13.24%) | 173.3 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.54 V (6.42%) | 22.5 V | 2.54 V (10.59%) | 138.7 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.16 V (4.81%) | 22.8 V | 1.91 V (7.94%) | 104.0 W | ~ ≤5% |
FAQ — 90 Amp Cable Size at 120 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 90A at 120 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 90A over 120m at 24V (voltage drop: 0.58V or 2.4%).
What is the power capacity of 90A at 24V?
At unity power factor, 90A at 24V supports 2.16 kW with a standard 90A circuit breaker.
Related Lengths & Currents (24V)
90A · 5m (24V)90A · 10m (24V)90A · 15m (24V)90A · 20m (24V)90A · 25m (24V)90A · 30m (24V)90A · 35m (24V)90A · 40m (24V)90A · 45m (24V)90A · 50m (24V)90A · 60m (24V)90A · 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)