125 Amp Cable Size at 70 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 70 m (229.7 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 1.25V (2.6%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.54V (3.22%)
Voltage at Load46.8 VLine Loss: 156.0 W
Max Power & Breaker6.0 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 70m
| 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 | 249.67 V (520.14%) | 0.0 V | 411.83 V (857.99%) | 31208.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 149.8 V (312.08%) | 0.0 V | 247.1 V (514.79%) | 18725.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 93.62 V (195.05%) | 0.0 V | 154.44 V (321.74%) | 11703.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 62.42 V (130.03%) | 0.0 V | 102.96 V (214.5%) | 7802.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 37.45 V (78.02%) | 10.6 V | 61.78 V (128.7%) | 4681.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 23.41 V (48.76%) | 24.6 V | 38.61 V (80.44%) | 2925.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 14.98 V (31.21%) | 33.0 V | 24.71 V (51.48%) | 1872.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 10.7 V (22.29%) | 37.3 V | 17.65 V (36.77%) | 1337.5 W | Drop High |
| 50 mm² | 151 A | 118 A | 7.49 V (15.6%) | 40.5 V | 12.36 V (25.74%) | 936.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.35 V (11.15%) | 42.6 V | 8.82 V (18.39%) | 668.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.94 V (8.21%) | 44.1 V | 6.5 V (13.55%) | 492.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.12 V (6.5%) | 44.9 V | 5.15 V (10.72%) | 390.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.5 V (5.2%) | 45.5 V | 4.12 V (8.58%) | 312.1 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.02 V (4.22%) | 46.0 V | 3.34 V (6.96%) | 253.0 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 1.56 V (3.25%) | 46.4 V | 2.57 V (5.36%) | 195.1 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 1.25 V (2.6%) | 46.8 V | 2.06 V (4.29%) | 156.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.94 V (1.95%) | 47.1 V | 1.54 V (3.22%) | 117.0 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 70 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 125A at 70 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 125A over 70m at 48V (voltage drop: 1.25V or 2.6%).
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)10A · 70m (48V)16A · 70m (48V)20A · 70m (48V)25A · 70m (48V)32A · 70m (48V)40A · 70m (48V)50A · 70m (48V)63A · 70m (48V)80A · 70m (48V)100A · 70m (48V)160A · 70m (48V)200A · 70m (48V)