40 Amp Cable Size at 40 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 40 m (131.2 ft).
Copper Cable (≤3% Drop)6 mm²Drop: 9.88V (2.38%)
Aluminum Cable (≤3% Drop)10 mm²Drop: 9.78V (2.36%)
Voltage at Load405.1 VLine Loss: 684.8 W
Max Power & Breaker28.75 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 40m
| 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 | 39.54 V (9.53%) | 375.5 V | 65.22 V (15.72%) | 2739.2 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 23.72 V (5.72%) | 391.3 V | 39.13 V (9.43%) | 1643.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 14.83 V (3.57%) | 400.2 V | 24.46 V (5.89%) | 1027.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 9.88 V (2.38%) | 405.1 V | 16.3 V (3.93%) | 684.8 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 5.93 V (1.43%) | 409.1 V | 9.78 V (2.36%) | 410.9 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 3.71 V (0.89%) | 411.3 V | 6.11 V (1.47%) | 256.8 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 2.37 V (0.57%) | 412.6 V | 3.91 V (0.94%) | 164.4 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.69 V (0.41%) | 413.3 V | 2.8 V (0.67%) | 117.4 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.19 V (0.29%) | 413.8 V | 1.96 V (0.47%) | 82.2 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.85 V (0.2%) | 414.2 V | 1.4 V (0.34%) | 58.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.62 V (0.15%) | 414.4 V | 1.03 V (0.25%) | 43.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.49 V (0.12%) | 414.5 V | 0.82 V (0.2%) | 34.2 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.4 V (0.1%) | 414.6 V | 0.65 V (0.16%) | 27.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.32 V (0.08%) | 414.7 V | 0.53 V (0.13%) | 22.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.25 V (0.06%) | 414.8 V | 0.41 V (0.1%) | 17.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.2 V (0.05%) | 414.8 V | 0.33 V (0.08%) | 13.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.15 V (0.04%) | 414.9 V | 0.24 V (0.06%) | 10.3 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 40 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 40A at 40 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 6 mm² copper cable for 40A over 40m at 415V (voltage drop: 9.88V or 2.38%).
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 · 45m (415V)40A · 50m (415V)40A · 60m (415V)40A · 70m (415V)10A · 40m (415V)16A · 40m (415V)20A · 40m (415V)25A · 40m (415V)32A · 40m (415V)50A · 40m (415V)63A · 40m (415V)80A · 40m (415V)100A · 40m (415V)125A · 40m (415V)160A · 40m (415V)200A · 40m (415V)