30 Amp Cable Size at 70 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 30 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 0.6V (2.5%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 0.62V (2.57%)
Voltage at Load23.4 VLine Loss: 18.0 W
Max Power & Breaker0.72 kW30A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 30A at 70m
| 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 | 59.92 V (249.67%) | 0.0 V | 98.84 V (411.83%) | 1797.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 35.95 V (149.8%) | 0.0 V | 59.3 V (247.1%) | 1078.6 W | Drop High |
| 4 mm² | 32 A | 25 A | 22.47 V (93.62%) | 1.5 V | 37.06 V (154.44%) | 674.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 14.98 V (62.42%) | 9.0 V | 24.71 V (102.96%) | 449.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 8.99 V (37.45%) | 15.0 V | 14.83 V (61.78%) | 269.6 W | Drop High |
| 16 mm² | 76 A | 59 A | 5.62 V (23.41%) | 18.4 V | 9.27 V (38.61%) | 168.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.6 V (14.98%) | 20.4 V | 5.93 V (24.71%) | 107.9 W | Drop High |
| 35 mm² | 125 A | 97 A | 2.57 V (10.7%) | 21.4 V | 4.24 V (17.65%) | 77.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 1.8 V (7.49%) | 22.2 V | 2.97 V (12.35%) | 53.9 W | Drop High |
| 70 mm² | 192 A | 150 A | 1.28 V (5.35%) | 22.7 V | 2.12 V (8.82%) | 38.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 0.95 V (3.94%) | 23.1 V | 1.56 V (6.5%) | 28.4 W | ~ ≤5% |
| 120 mm² | 269 A | 210 A | 0.75 V (3.12%) | 23.3 V | 1.24 V (5.15%) | 22.5 W | ~ ≤5% |
| 150 mm² | 309 A | 241 A | 0.6 V (2.5%) | 23.4 V | 0.99 V (4.12%) | 18.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.49 V (2.02%) | 23.5 V | 0.8 V (3.34%) | 14.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.37 V (1.56%) | 23.6 V | 0.62 V (2.57%) | 11.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.3 V (1.25%) | 23.7 V | 0.49 V (2.06%) | 9.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.22 V (0.94%) | 23.8 V | 0.37 V (1.54%) | 6.7 W | ✓ OK (≤3%) |
FAQ — 30 Amp Cable Size at 70 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 30A at 70 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 30A over 70m at 24V (voltage drop: 0.6V or 2.5%).
What is the power capacity of 30A at 24V?
At unity power factor, 30A at 24V supports 0.72 kW with a standard 30A circuit breaker.
Related Lengths & Currents (24V)
30A · 5m (24V)30A · 10m (24V)30A · 15m (24V)30A · 20m (24V)30A · 25m (24V)30A · 30m (24V)30A · 35m (24V)30A · 40m (24V)30A · 45m (24V)30A · 50m (24V)30A · 60m (24V)10A · 70m (24V)16A · 70m (24V)20A · 70m (24V)25A · 70m (24V)32A · 70m (24V)40A · 70m (24V)50A · 70m (24V)63A · 70m (24V)80A · 70m (24V)100A · 70m (24V)125A · 70m (24V)160A · 70m (24V)200A · 70m (24V)