25 Amp Cable Size at 25 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 25 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 0.53V (2.23%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 0.63V (2.63%)
Voltage at Load23.5 VLine Loss: 13.4 W
Max Power & Breaker0.6 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A at 25m
| 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 | 17.83 V (74.31%) | 6.2 V | 29.42 V (122.57%) | 445.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 10.7 V (44.58%) | 13.3 V | 17.65 V (73.54%) | 267.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 6.69 V (27.86%) | 17.3 V | 11.03 V (45.96%) | 167.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 4.46 V (18.58%) | 19.5 V | 7.35 V (30.64%) | 111.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 2.67 V (11.15%) | 21.3 V | 4.41 V (18.39%) | 66.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 1.67 V (6.97%) | 22.3 V | 2.76 V (11.49%) | 41.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.07 V (4.46%) | 22.9 V | 1.76 V (7.35%) | 26.7 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 0.76 V (3.18%) | 23.2 V | 1.26 V (5.25%) | 19.1 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 0.53 V (2.23%) | 23.5 V | 0.88 V (3.68%) | 13.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.38 V (1.59%) | 23.6 V | 0.63 V (2.63%) | 9.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.28 V (1.17%) | 23.7 V | 0.46 V (1.94%) | 7.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.22 V (0.93%) | 23.8 V | 0.37 V (1.53%) | 5.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.18 V (0.74%) | 23.8 V | 0.29 V (1.23%) | 4.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.14 V (0.6%) | 23.9 V | 0.24 V (0.99%) | 3.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.11 V (0.46%) | 23.9 V | 0.18 V (0.77%) | 2.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.09 V (0.37%) | 23.9 V | 0.15 V (0.61%) | 2.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.07 V (0.28%) | 23.9 V | 0.11 V (0.46%) | 1.7 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 25 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 25A at 25 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 25A over 25m at 24V (voltage drop: 0.53V or 2.23%).
What is the power capacity of 25A at 24V?
At unity power factor, 25A at 24V supports 0.6 kW with a standard 25A circuit breaker.
Related Lengths & Currents (24V)
25A · 5m (24V)25A · 10m (24V)25A · 15m (24V)25A · 20m (24V)25A · 30m (24V)25A · 35m (24V)25A · 40m (24V)25A · 45m (24V)25A · 50m (24V)25A · 60m (24V)25A · 70m (24V)10A · 25m (24V)16A · 25m (24V)20A · 25m (24V)32A · 25m (24V)40A · 25m (24V)50A · 25m (24V)63A · 25m (24V)80A · 25m (24V)100A · 25m (24V)125A · 25m (24V)160A · 25m (24V)200A · 25m (24V)