15 Amp Cable Size at 70 Meters (415V Three-Phase (UK / Australia Industrial))
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)4 mm²Drop: 9.73V (2.34%)
Aluminum Cable (≤3% Drop)6 mm²Drop: 10.7V (2.58%)
Voltage at Load405.3 VLine Loss: 252.8 W
Max Power & Breaker10.78 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 | 25.95 V (6.25%) | 389.1 V | 42.8 V (10.31%) | 674.1 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 15.57 V (3.75%) | 399.4 V | 25.68 V (6.19%) | 404.5 W | ~ ≤5% |
| 4 mm² | 32 A | 25 A | 9.73 V (2.34%) | 405.3 V | 16.05 V (3.87%) | 252.8 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 6.49 V (1.56%) | 408.5 V | 10.7 V (2.58%) | 168.5 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 3.89 V (0.94%) | 411.1 V | 6.42 V (1.55%) | 101.1 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.43 V (0.59%) | 412.6 V | 4.01 V (0.97%) | 63.2 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.56 V (0.38%) | 413.4 V | 2.57 V (0.62%) | 40.4 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.11 V (0.27%) | 413.9 V | 1.83 V (0.44%) | 28.9 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.78 V (0.19%) | 414.2 V | 1.28 V (0.31%) | 20.2 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.56 V (0.13%) | 414.4 V | 0.92 V (0.22%) | 14.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.41 V (0.1%) | 414.6 V | 0.68 V (0.16%) | 10.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.32 V (0.08%) | 414.7 V | 0.53 V (0.13%) | 8.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.26 V (0.06%) | 414.7 V | 0.43 V (0.1%) | 6.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.21 V (0.05%) | 414.8 V | 0.35 V (0.08%) | 5.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.16 V (0.04%) | 414.8 V | 0.27 V (0.06%) | 4.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.13 V (0.03%) | 414.9 V | 0.21 V (0.05%) | 3.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.1 V (0.02%) | 414.9 V | 0.16 V (0.04%) | 2.5 W | ✓ OK (≤3%) |
FAQ — 15 Amp Cable Size at 70 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 15A at 70 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 15A over 70m at 415V (voltage drop: 9.73V or 2.34%).
What is the power capacity of 15A at 415V?
At unity power factor, 15A at 415V supports 10.78 kW with a standard 15A circuit breaker.
Related Lengths & Currents (415V)
15A · 5m (415V)15A · 10m (415V)15A · 15m (415V)15A · 20m (415V)15A · 25m (415V)15A · 30m (415V)15A · 35m (415V)15A · 40m (415V)15A · 45m (415V)15A · 50m (415V)15A · 60m (415V)10A · 70m (415V)16A · 70m (415V)20A · 70m (415V)25A · 70m (415V)32A · 70m (415V)40A · 70m (415V)50A · 70m (415V)63A · 70m (415V)80A · 70m (415V)100A · 70m (415V)125A · 70m (415V)160A · 70m (415V)200A · 70m (415V)