40 Amp Cable Size at 5 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 5 m (16.4 ft).
Copper Cable (≤3% Drop)6 mm²Drop: 1.43V (2.97%)
Aluminum Cable (≤3% Drop)10 mm²Drop: 1.41V (2.94%)
Voltage at Load46.6 VLine Loss: 57.1 W
Max Power & Breaker1.92 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 5m
| 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 | 5.71 V (11.89%) | 42.3 V | 9.41 V (19.61%) | 228.3 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 3.42 V (7.13%) | 44.6 V | 5.65 V (11.77%) | 137.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 2.14 V (4.46%) | 45.9 V | 3.53 V (7.35%) | 85.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 1.43 V (2.97%) | 46.6 V | 2.35 V (4.9%) | 57.1 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 0.86 V (1.78%) | 47.1 V | 1.41 V (2.94%) | 34.2 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 0.54 V (1.11%) | 47.5 V | 0.88 V (1.84%) | 21.4 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.34 V (0.71%) | 47.7 V | 0.56 V (1.18%) | 13.7 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.24 V (0.51%) | 47.8 V | 0.4 V (0.84%) | 9.8 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.17 V (0.36%) | 47.8 V | 0.28 V (0.59%) | 6.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.12 V (0.25%) | 47.9 V | 0.2 V (0.42%) | 4.9 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.09 V (0.19%) | 47.9 V | 0.15 V (0.31%) | 3.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.07 V (0.15%) | 47.9 V | 0.12 V (0.25%) | 2.9 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.06 V (0.12%) | 47.9 V | 0.09 V (0.2%) | 2.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.05 V (0.1%) | 48.0 V | 0.08 V (0.16%) | 1.9 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.04 V (0.07%) | 48.0 V | 0.06 V (0.12%) | 1.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.03 V (0.06%) | 48.0 V | 0.05 V (0.1%) | 1.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.02 V (0.04%) | 48.0 V | 0.04 V (0.07%) | 0.9 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 5 Meters (48V DC (LiFePO4 Battery Bank / Telecom))
What mm² cable size is required for 40A at 5 meters (48V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 6 mm² copper cable for 40A over 5m at 48V (voltage drop: 1.43V or 2.97%).
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 · 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 · 5m (48V)16A · 5m (48V)20A · 5m (48V)25A · 5m (48V)32A · 5m (48V)50A · 5m (48V)63A · 5m (48V)80A · 5m (48V)100A · 5m (48V)125A · 5m (48V)160A · 5m (48V)200A · 5m (48V)