5 Amp Cable Size at 40 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 5 A over 40 m (131.2 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 0.54V (2.23%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 0.56V (2.35%)
Voltage at Load23.5 VLine Loss: 2.7 W
Max Power & Breaker0.12 kW6A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 5A 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 | 5.71 V (23.78%) | 18.3 V | 9.41 V (39.22%) | 28.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 3.42 V (14.27%) | 20.6 V | 5.65 V (23.53%) | 17.1 W | Drop High |
| 4 mm² | 32 A | 25 A | 2.14 V (8.92%) | 21.9 V | 3.53 V (14.71%) | 10.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 1.43 V (5.94%) | 22.6 V | 2.35 V (9.81%) | 7.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 0.86 V (3.57%) | 23.1 V | 1.41 V (5.88%) | 4.3 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 0.54 V (2.23%) | 23.5 V | 0.88 V (3.68%) | 2.7 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.34 V (1.43%) | 23.7 V | 0.56 V (2.35%) | 1.7 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.24 V (1.02%) | 23.8 V | 0.4 V (1.68%) | 1.2 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.17 V (0.71%) | 23.8 V | 0.28 V (1.18%) | 0.9 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.12 V (0.51%) | 23.9 V | 0.2 V (0.84%) | 0.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.09 V (0.38%) | 23.9 V | 0.15 V (0.62%) | 0.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.07 V (0.3%) | 23.9 V | 0.12 V (0.49%) | 0.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.06 V (0.24%) | 23.9 V | 0.09 V (0.39%) | 0.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.05 V (0.19%) | 24.0 V | 0.08 V (0.32%) | 0.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.04 V (0.15%) | 24.0 V | 0.06 V (0.25%) | 0.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.03 V (0.12%) | 24.0 V | 0.05 V (0.2%) | 0.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.02 V (0.09%) | 24.0 V | 0.04 V (0.15%) | 0.1 W | ✓ OK (≤3%) |
FAQ — 5 Amp Cable Size at 40 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 5A at 40 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 5A over 40m at 24V (voltage drop: 0.54V or 2.23%).
What is the power capacity of 5A at 24V?
At unity power factor, 5A at 24V supports 0.12 kW with a standard 6A circuit breaker.
Related Lengths & Currents (24V)
5A · 5m (24V)5A · 10m (24V)5A · 15m (24V)5A · 20m (24V)5A · 25m (24V)5A · 30m (24V)5A · 35m (24V)5A · 45m (24V)5A · 50m (24V)5A · 60m (24V)5A · 70m (24V)10A · 40m (24V)16A · 40m (24V)20A · 40m (24V)25A · 40m (24V)32A · 40m (24V)40A · 40m (24V)50A · 40m (24V)63A · 40m (24V)80A · 40m (24V)100A · 40m (24V)125A · 40m (24V)160A · 40m (24V)200A · 40m (24V)