25 Amp Cable Size at 35 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 35 m (114.8 ft).
Copper Cable (≤3% Drop)70 mm²Drop: 0.53V (2.23%)
Aluminum Cable (≤3% Drop)95 mm²Drop: 0.65V (2.71%)
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 35m
| 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 | 24.97 V (104.03%) | 0.0 V | 41.18 V (171.6%) | 624.2 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 14.98 V (62.42%) | 9.0 V | 24.71 V (102.96%) | 374.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 9.36 V (39.01%) | 14.6 V | 15.44 V (64.35%) | 234.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 6.24 V (26.01%) | 17.8 V | 10.3 V (42.9%) | 156.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 3.74 V (15.6%) | 20.3 V | 6.18 V (25.74%) | 93.6 W | Drop High |
| 16 mm² | 76 A | 59 A | 2.34 V (9.75%) | 21.7 V | 3.86 V (16.09%) | 58.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.5 V (6.24%) | 22.5 V | 2.47 V (10.3%) | 37.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 1.07 V (4.46%) | 22.9 V | 1.76 V (7.35%) | 26.8 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 0.75 V (3.12%) | 23.3 V | 1.24 V (5.15%) | 18.7 W | ~ ≤5% |
| 70 mm² | 192 A | 150 A | 0.53 V (2.23%) | 23.5 V | 0.88 V (3.68%) | 13.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.39 V (1.64%) | 23.6 V | 0.65 V (2.71%) | 9.9 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.31 V (1.3%) | 23.7 V | 0.51 V (2.14%) | 7.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.25 V (1.04%) | 23.8 V | 0.41 V (1.72%) | 6.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.2 V (0.84%) | 23.8 V | 0.33 V (1.39%) | 5.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.16 V (0.65%) | 23.8 V | 0.26 V (1.07%) | 3.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.12 V (0.52%) | 23.9 V | 0.21 V (0.86%) | 3.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.09 V (0.39%) | 23.9 V | 0.15 V (0.64%) | 2.3 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 35 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 25A at 35 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 70 mm² copper cable for 25A over 35m 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 · 25m (24V)25A · 30m (24V)25A · 40m (24V)25A · 45m (24V)25A · 50m (24V)25A · 60m (24V)25A · 70m (24V)10A · 35m (24V)16A · 35m (24V)20A · 35m (24V)32A · 35m (24V)40A · 35m (24V)50A · 35m (24V)63A · 35m (24V)80A · 35m (24V)100A · 35m (24V)125A · 35m (24V)160A · 35m (24V)200A · 35m (24V)