40 Amp Cable Size at 400 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 40 A over 400 m (1312.3 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.85V (1.78%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.82V (5.88%)
Voltage at Load47.1 VLine Loss: 34.2 W
Max Power & Breaker1.92 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 400m
| 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 | 456.53 V (951.11%) | 0.0 V | 753.07 V (1568.89%) | 18261.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 273.92 V (570.67%) | 0.0 V | 451.84 V (941.33%) | 10956.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 171.2 V (356.67%) | 0.0 V | 282.4 V (588.33%) | 6848.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 114.13 V (237.78%) | 0.0 V | 188.27 V (392.22%) | 4565.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 68.48 V (142.67%) | 0.0 V | 112.96 V (235.33%) | 2739.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 42.8 V (89.17%) | 5.2 V | 70.6 V (147.08%) | 1712.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 27.39 V (57.07%) | 20.6 V | 45.18 V (94.13%) | 1095.7 W | Drop High |
| 35 mm² | 125 A | 97 A | 19.57 V (40.76%) | 28.4 V | 32.27 V (67.24%) | 782.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 13.7 V (28.53%) | 34.3 V | 22.59 V (47.07%) | 547.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 9.78 V (20.38%) | 38.2 V | 16.14 V (33.62%) | 391.3 W | Drop High |
| 95 mm² | 232 A | 181 A | 7.21 V (15.02%) | 40.8 V | 11.89 V (24.77%) | 288.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 5.71 V (11.89%) | 42.3 V | 9.41 V (19.61%) | 228.3 W | Drop High |
| 150 mm² | 309 A | 241 A | 4.57 V (9.51%) | 43.4 V | 7.53 V (15.69%) | 182.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.7 V (7.71%) | 44.3 V | 6.11 V (12.72%) | 148.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.85 V (5.94%) | 45.1 V | 4.71 V (9.81%) | 114.1 W | Drop High |
| 300 mm² | 477 A | 372 A | 2.28 V (4.76%) | 45.7 V | 3.77 V (7.84%) | 91.3 W | ~ ≤5% |
| 400 mm² | 570 A | 445 A | 1.71 V (3.57%) | 46.3 V | 2.82 V (5.88%) | 68.5 W | ~ ≤5% |
FAQ — 40 Amp Cable Size at 400 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 40A at 400 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 40A over 400m at 48V (voltage drop: 0.85V or 1.78%).
What is the power capacity of 40A at 48V?
At unity power factor, 40A at 48V supports 1.92 kW with a standard 40A circuit breaker.
Related Lengths & Currents (48V)
40A · 5m (48V)40A · 10m (48V)40A · 15m (48V)40A · 20m (48V)40A · 25m (48V)40A · 30m (48V)40A · 35m (48V)40A · 40m (48V)40A · 45m (48V)40A · 50m (48V)40A · 60m (48V)40A · 70m (48V)10A · 400m (48V)16A · 400m (48V)20A · 400m (48V)25A · 400m (48V)32A · 400m (48V)50A · 400m (48V)63A · 400m (48V)80A · 400m (48V)100A · 400m (48V)125A · 400m (48V)160A · 400m (48V)200A · 400m (48V)