16 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 16 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 0.55V (2.28%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 0.65V (2.69%)
Voltage at Load23.5 VLine Loss: 8.8 W
Max Power & Breaker0.38 kW16A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 16A 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 | 9.13 V (38.04%) | 14.9 V | 15.06 V (62.76%) | 146.1 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 5.48 V (22.83%) | 18.5 V | 9.04 V (37.65%) | 87.7 W | Drop High |
| 4 mm² | 32 A | 25 A | 3.42 V (14.27%) | 20.6 V | 5.65 V (23.53%) | 54.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 2.28 V (9.51%) | 21.7 V | 3.77 V (15.69%) | 36.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 1.37 V (5.71%) | 22.6 V | 2.26 V (9.41%) | 21.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 0.86 V (3.57%) | 23.1 V | 1.41 V (5.88%) | 13.7 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 0.55 V (2.28%) | 23.5 V | 0.9 V (3.77%) | 8.8 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.39 V (1.63%) | 23.6 V | 0.65 V (2.69%) | 6.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.27 V (1.14%) | 23.7 V | 0.45 V (1.88%) | 4.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.2 V (0.82%) | 23.8 V | 0.32 V (1.34%) | 3.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.14 V (0.6%) | 23.9 V | 0.24 V (0.99%) | 2.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.11 V (0.48%) | 23.9 V | 0.19 V (0.78%) | 1.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.09 V (0.38%) | 23.9 V | 0.15 V (0.63%) | 1.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.07 V (0.31%) | 23.9 V | 0.12 V (0.51%) | 1.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.06 V (0.24%) | 23.9 V | 0.09 V (0.39%) | 0.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.05 V (0.19%) | 24.0 V | 0.08 V (0.31%) | 0.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.03 V (0.14%) | 24.0 V | 0.06 V (0.24%) | 0.5 W | ✓ OK (≤3%) |
FAQ — 16 Amp Cable Size at 20 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 16A at 20 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 16A over 20m at 24V (voltage drop: 0.55V or 2.28%).
What is the power capacity of 16A at 24V?
At unity power factor, 16A at 24V supports 0.38 kW with a standard 16A circuit breaker.
Related Lengths & Currents (24V)
16A · 5m (24V)16A · 10m (24V)16A · 15m (24V)16A · 25m (24V)16A · 30m (24V)16A · 35m (24V)16A · 40m (24V)16A · 45m (24V)16A · 50m (24V)16A · 60m (24V)16A · 70m (24V)10A · 20m (24V)20A · 20m (24V)25A · 20m (24V)32A · 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)