125 Amp Cable Size at 300 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 125 A over 300 m (984.3 ft).
Copper Cable (≤3% Drop)3× 400 mm²Drop: 1.34V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 6.62V (13.79%)
Voltage at Load46.7 VLine Loss: 167.2 W
Max Power & Breaker6.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 300m
| 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 | 1070.0 V (2229.17%) | 0.0 V | 1765.0 V (3677.08%) | 133750.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 642.0 V (1337.5%) | 0.0 V | 1059.0 V (2206.25%) | 80250.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 401.25 V (835.94%) | 0.0 V | 661.88 V (1378.91%) | 50156.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 267.5 V (557.29%) | 0.0 V | 441.25 V (919.27%) | 33437.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 160.5 V (334.38%) | 0.0 V | 264.75 V (551.56%) | 20062.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 100.31 V (208.98%) | 0.0 V | 165.47 V (344.73%) | 12539.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 64.2 V (133.75%) | 0.0 V | 105.9 V (220.62%) | 8025.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 45.86 V (95.54%) | 2.1 V | 75.64 V (157.59%) | 5732.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 32.1 V (66.87%) | 15.9 V | 52.95 V (110.31%) | 4012.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 22.93 V (47.77%) | 25.1 V | 37.82 V (78.79%) | 2866.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 16.89 V (35.2%) | 31.1 V | 27.87 V (58.06%) | 2111.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 13.38 V (27.86%) | 34.6 V | 22.06 V (45.96%) | 1671.9 W | Drop High |
| 150 mm² | 309 A | 241 A | 10.7 V (22.29%) | 37.3 V | 17.65 V (36.77%) | 1337.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 8.68 V (18.07%) | 39.3 V | 14.31 V (29.81%) | 1084.5 W | Drop High |
| 240 mm² | 415 A | 324 A | 6.69 V (13.93%) | 41.3 V | 11.03 V (22.98%) | 835.9 W | Drop High |
| 300 mm² | 477 A | 372 A | 5.35 V (11.15%) | 42.6 V | 8.82 V (18.39%) | 668.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 4.01 V (8.36%) | 44.0 V | 6.62 V (13.79%) | 501.6 W | Drop High |
FAQ — 125 Amp Cable Size at 300 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 125A at 300 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 3× 400 mm² copper cable for 125A over 300m at 48V (voltage drop: 1.34V or 2.79%).
What is the power capacity of 125A at 48V?
At unity power factor, 125A at 48V supports 6.0 kW with a standard 125A circuit breaker.
Related Lengths & Currents (48V)
125A · 5m (48V)125A · 10m (48V)125A · 15m (48V)125A · 20m (48V)125A · 25m (48V)125A · 30m (48V)125A · 35m (48V)125A · 40m (48V)125A · 45m (48V)125A · 50m (48V)125A · 60m (48V)125A · 70m (48V)10A · 300m (48V)16A · 300m (48V)20A · 300m (48V)25A · 300m (48V)32A · 300m (48V)40A · 300m (48V)50A · 300m (48V)63A · 300m (48V)80A · 300m (48V)100A · 300m (48V)160A · 300m (48V)200A · 300m (48V)