40 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 40 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)10 mm²Drop: 10.38V (2.5%)
Aluminum Cable (≤3% Drop)16 mm²Drop: 10.7V (2.58%)
Voltage at Load404.6 VLine Loss: 719.0 W
Max Power & Breaker28.75 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A 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 | 69.19 V (16.67%) | 345.8 V | 114.13 V (27.5%) | 4793.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 41.51 V (10.0%) | 373.5 V | 68.48 V (16.5%) | 2876.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 25.95 V (6.25%) | 389.1 V | 42.8 V (10.31%) | 1797.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 17.3 V (4.17%) | 397.7 V | 28.53 V (6.88%) | 1198.4 W | ~ ≤5% |
| 10 mm² | 57 A | 44 A | 10.38 V (2.5%) | 404.6 V | 17.12 V (4.13%) | 719.0 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 6.49 V (1.56%) | 408.5 V | 10.7 V (2.58%) | 449.4 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 4.15 V (1.0%) | 410.8 V | 6.85 V (1.65%) | 287.6 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 2.97 V (0.71%) | 412.0 V | 4.89 V (1.18%) | 205.4 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 2.08 V (0.5%) | 412.9 V | 3.42 V (0.83%) | 143.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.48 V (0.36%) | 413.5 V | 2.45 V (0.59%) | 102.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 1.09 V (0.26%) | 413.9 V | 1.8 V (0.43%) | 75.7 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.86 V (0.21%) | 414.1 V | 1.43 V (0.34%) | 59.9 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.69 V (0.17%) | 414.3 V | 1.14 V (0.28%) | 47.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.56 V (0.14%) | 414.4 V | 0.93 V (0.22%) | 38.9 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.43 V (0.1%) | 414.6 V | 0.71 V (0.17%) | 30.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.35 V (0.08%) | 414.7 V | 0.57 V (0.14%) | 24.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.26 V (0.06%) | 414.7 V | 0.43 V (0.1%) | 18.0 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 70 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 40A at 70 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 10 mm² copper cable for 40A over 70m at 415V (voltage drop: 10.38V or 2.5%).
What is the power capacity of 40A at 415V?
At unity power factor, 40A at 415V supports 28.75 kW with a standard 40A circuit breaker.
Related Lengths & Currents (415V)
40A · 5m (415V)40A · 10m (415V)40A · 15m (415V)40A · 20m (415V)40A · 25m (415V)40A · 30m (415V)40A · 35m (415V)40A · 40m (415V)40A · 45m (415V)40A · 50m (415V)40A · 60m (415V)10A · 70m (415V)16A · 70m (415V)20A · 70m (415V)25A · 70m (415V)32A · 70m (415V)50A · 70m (415V)63A · 70m (415V)80A · 70m (415V)100A · 70m (415V)125A · 70m (415V)160A · 70m (415V)200A · 70m (415V)