400 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 400 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 1.43V (2.97%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.41V (2.94%)
Voltage at Load46.6 VLine Loss: 570.7 W
Max Power & Breaker19.2 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A at 20m
| 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 | 228.27 V (475.56%) | 0.0 V | 376.53 V (784.44%) | 91306.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 136.96 V (285.33%) | 0.0 V | 225.92 V (470.67%) | 54784.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 85.6 V (178.33%) | 0.0 V | 141.2 V (294.17%) | 34240.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 57.07 V (118.89%) | 0.0 V | 94.13 V (196.11%) | 22826.7 W | Drop High |
| 10 mm² | 57 A | 44 A | 34.24 V (71.33%) | 13.8 V | 56.48 V (117.67%) | 13696.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 21.4 V (44.58%) | 26.6 V | 35.3 V (73.54%) | 8560.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 13.7 V (28.53%) | 34.3 V | 22.59 V (47.07%) | 5478.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 9.78 V (20.38%) | 38.2 V | 16.14 V (33.62%) | 3913.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 6.85 V (14.27%) | 41.2 V | 11.3 V (23.53%) | 2739.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 4.89 V (10.19%) | 43.1 V | 8.07 V (16.81%) | 1956.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.6 V (7.51%) | 44.4 V | 5.95 V (12.39%) | 1441.7 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.85 V (5.94%) | 45.1 V | 4.71 V (9.81%) | 1141.3 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.28 V (4.76%) | 45.7 V | 3.77 V (7.84%) | 913.1 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.85 V (3.86%) | 46.1 V | 3.05 V (6.36%) | 740.3 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.43 V (2.97%) | 46.6 V | 2.35 V (4.9%) | 570.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.14 V (2.38%) | 46.9 V | 1.88 V (3.92%) | 456.5 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.86 V (1.78%) | 47.1 V | 1.41 V (2.94%) | 342.4 W | ✓ OK (≤3%) |
FAQ — 400 Amp Cable Size at 20 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 400A at 20 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 400A over 20m at 48V (voltage drop: 1.43V or 2.97%).
What is the power capacity of 400A at 48V?
At unity power factor, 400A at 48V supports 19.2 kW with a standard 400A circuit breaker.
Related Lengths & Currents (48V)
400A · 5m (48V)400A · 10m (48V)400A · 15m (48V)400A · 25m (48V)400A · 30m (48V)400A · 35m (48V)400A · 40m (48V)400A · 45m (48V)400A · 50m (48V)400A · 60m (48V)400A · 70m (48V)10A · 20m (48V)16A · 20m (48V)20A · 20m (48V)25A · 20m (48V)32A · 20m (48V)40A · 20m (48V)50A · 20m (48V)63A · 20m (48V)80A · 20m (48V)100A · 20m (48V)125A · 20m (48V)160A · 20m (48V)200A · 20m (48V)