15 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 15 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)70 mm²Drop: 0.64V (2.67%)
Aluminum Cable (≤3% Drop)120 mm²Drop: 0.62V (2.57%)
Voltage at Load23.4 VLine Loss: 9.6 W
Max Power & Breaker0.36 kW15A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 15A 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 | 29.96 V (124.83%) | 0.0 V | 49.42 V (205.92%) | 449.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 17.98 V (74.9%) | 6.0 V | 29.65 V (123.55%) | 269.6 W | Drop High |
| 4 mm² | 32 A | 25 A | 11.23 V (46.81%) | 12.8 V | 18.53 V (77.22%) | 168.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 7.49 V (31.21%) | 16.5 V | 12.36 V (51.48%) | 112.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 4.49 V (18.73%) | 19.5 V | 7.41 V (30.89%) | 67.4 W | Drop High |
| 16 mm² | 76 A | 59 A | 2.81 V (11.7%) | 21.2 V | 4.63 V (19.3%) | 42.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 1.8 V (7.49%) | 22.2 V | 2.97 V (12.35%) | 27.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 1.28 V (5.35%) | 22.7 V | 2.12 V (8.82%) | 19.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 0.9 V (3.75%) | 23.1 V | 1.48 V (6.18%) | 13.5 W | ~ ≤5% |
| 70 mm² | 192 A | 150 A | 0.64 V (2.67%) | 23.4 V | 1.06 V (4.41%) | 9.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.47 V (1.97%) | 23.5 V | 0.78 V (3.25%) | 7.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.37 V (1.56%) | 23.6 V | 0.62 V (2.57%) | 5.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.3 V (1.25%) | 23.7 V | 0.49 V (2.06%) | 4.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.24 V (1.01%) | 23.8 V | 0.4 V (1.67%) | 3.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.19 V (0.78%) | 23.8 V | 0.31 V (1.29%) | 2.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.15 V (0.62%) | 23.9 V | 0.25 V (1.03%) | 2.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.11 V (0.47%) | 23.9 V | 0.19 V (0.77%) | 1.7 W | ✓ OK (≤3%) |
FAQ — 15 Amp Cable Size at 70 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 15A at 70 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 70 mm² copper cable for 15A over 70m at 24V (voltage drop: 0.64V or 2.67%).
What is the power capacity of 15A at 24V?
At unity power factor, 15A at 24V supports 0.36 kW with a standard 15A circuit breaker.
Related Lengths & Currents (24V)
15A · 5m (24V)15A · 10m (24V)15A · 15m (24V)15A · 20m (24V)15A · 25m (24V)15A · 30m (24V)15A · 35m (24V)15A · 40m (24V)15A · 45m (24V)15A · 50m (24V)15A · 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)