32 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 32 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 0.55V (2.28%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 0.65V (2.69%)
Voltage at Load23.5 VLine Loss: 17.5 W
Max Power & Breaker0.77 kW32A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 32A 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 | 18.26 V (76.09%) | 5.7 V | 30.12 V (125.51%) | 584.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 10.96 V (45.65%) | 13.0 V | 18.07 V (75.31%) | 350.6 W | Drop High |
| 4 mm² | 32 A | 25 A | 6.85 V (28.53%) | 17.2 V | 11.3 V (47.07%) | 219.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 4.57 V (19.02%) | 19.4 V | 7.53 V (31.38%) | 146.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 2.74 V (11.41%) | 21.3 V | 4.52 V (18.83%) | 87.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.71 V (7.13%) | 22.3 V | 2.82 V (11.77%) | 54.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.1 V (4.57%) | 22.9 V | 1.81 V (7.53%) | 35.1 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 0.78 V (3.26%) | 23.2 V | 1.29 V (5.38%) | 25.0 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 0.55 V (2.28%) | 23.5 V | 0.9 V (3.77%) | 17.5 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.39 V (1.63%) | 23.6 V | 0.65 V (2.69%) | 12.5 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.29 V (1.2%) | 23.7 V | 0.48 V (1.98%) | 9.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.23 V (0.95%) | 23.8 V | 0.38 V (1.57%) | 7.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.18 V (0.76%) | 23.8 V | 0.3 V (1.26%) | 5.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.15 V (0.62%) | 23.9 V | 0.24 V (1.02%) | 4.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.11 V (0.48%) | 23.9 V | 0.19 V (0.78%) | 3.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.09 V (0.38%) | 23.9 V | 0.15 V (0.63%) | 2.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.07 V (0.29%) | 23.9 V | 0.11 V (0.47%) | 2.2 W | ✓ OK (≤3%) |
FAQ — 32 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 32A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 32A over 20m at 24V (voltage drop: 0.55V or 2.28%).
What is the power capacity of 32A at 24V?
At unity power factor, 32A at 24V supports 0.77 kW with a standard 32A circuit breaker.
Related Lengths & Currents (24V)
32A · 5m (24V)32A · 10m (24V)32A · 15m (24V)32A · 25m (24V)32A · 30m (24V)32A · 35m (24V)32A · 40m (24V)32A · 45m (24V)32A · 50m (24V)32A · 60m (24V)32A · 70m (24V)10A · 20m (24V)16A · 20m (24V)20A · 20m (24V)25A · 20m (24V)40A · 20m (24V)50A · 20m (24V)63A · 20m (24V)80A · 20m (24V)100A · 20m (24V)125A · 20m (24V)160A · 20m (24V)200A · 20m (24V)