125 Amp Cable Size at 40 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 40 m (131.2 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 1.43V (2.97%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 1.18V (2.45%)
Voltage at Load46.6 VLine Loss: 178.3 W
Max Power & Breaker6.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 40m
| 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 | 142.67 V (297.22%) | 0.0 V | 235.33 V (490.28%) | 17833.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 85.6 V (178.33%) | 0.0 V | 141.2 V (294.17%) | 10700.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 53.5 V (111.46%) | 0.0 V | 88.25 V (183.85%) | 6687.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 35.67 V (74.31%) | 12.3 V | 58.83 V (122.57%) | 4458.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 21.4 V (44.58%) | 26.6 V | 35.3 V (73.54%) | 2675.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 13.38 V (27.86%) | 34.6 V | 22.06 V (45.96%) | 1671.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 8.56 V (17.83%) | 39.4 V | 14.12 V (29.42%) | 1070.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 6.11 V (12.74%) | 41.9 V | 10.09 V (21.01%) | 764.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 4.28 V (8.92%) | 43.7 V | 7.06 V (14.71%) | 535.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.06 V (6.37%) | 44.9 V | 5.04 V (10.51%) | 382.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.25 V (4.69%) | 45.7 V | 3.72 V (7.74%) | 281.6 W | ~ ≤5% |
| 120 mm² | 269 A | 210 A | 1.78 V (3.72%) | 46.2 V | 2.94 V (6.13%) | 222.9 W | ~ ≤5% |
| 150 mm² | 309 A | 241 A | 1.43 V (2.97%) | 46.6 V | 2.35 V (4.9%) | 178.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.16 V (2.41%) | 46.8 V | 1.91 V (3.98%) | 144.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.89 V (1.86%) | 47.1 V | 1.47 V (3.06%) | 111.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.71 V (1.49%) | 47.3 V | 1.18 V (2.45%) | 89.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.54 V (1.11%) | 47.5 V | 0.88 V (1.84%) | 66.9 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 40 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 125A at 40 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 125A over 40m at 48V (voltage drop: 1.43V or 2.97%).
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 · 45m (48V)125A · 50m (48V)125A · 60m (48V)125A · 70m (48V)10A · 40m (48V)16A · 40m (48V)20A · 40m (48V)25A · 40m (48V)32A · 40m (48V)40A · 40m (48V)50A · 40m (48V)63A · 40m (48V)80A · 40m (48V)100A · 40m (48V)160A · 40m (48V)200A · 40m (48V)