40 Amp Cable Size at 50 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 40 A over 50 m (164.0 ft).
Copper Cable (≤3% Drop)6 mm²Drop: 12.36V (1.79%)
Aluminum Cable (≤3% Drop)10 mm²Drop: 12.23V (1.77%)
Voltage at Load677.6 VLine Loss: 856.0 W
Max Power & Breaker47.8 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 50m
| 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 | 49.42 V (7.16%) | 640.6 V | 81.52 V (11.81%) | 3424.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 29.65 V (4.3%) | 660.3 V | 48.91 V (7.09%) | 2054.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 1284.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 12.36 V (1.79%) | 677.6 V | 20.38 V (2.95%) | 856.0 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 7.41 V (1.07%) | 682.6 V | 12.23 V (1.77%) | 513.6 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 4.63 V (0.67%) | 685.4 V | 7.64 V (1.11%) | 321.0 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 2.97 V (0.43%) | 687.0 V | 4.89 V (0.71%) | 205.4 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 2.12 V (0.31%) | 687.9 V | 3.49 V (0.51%) | 146.7 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.48 V (0.21%) | 688.5 V | 2.45 V (0.35%) | 102.7 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.06 V (0.15%) | 688.9 V | 1.75 V (0.25%) | 73.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.78 V (0.11%) | 689.2 V | 1.29 V (0.19%) | 54.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.62 V (0.09%) | 689.4 V | 1.02 V (0.15%) | 42.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.49 V (0.07%) | 689.5 V | 0.82 V (0.12%) | 34.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.4 V (0.06%) | 689.6 V | 0.66 V (0.1%) | 27.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.31 V (0.04%) | 689.7 V | 0.51 V (0.07%) | 21.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.25 V (0.04%) | 689.8 V | 0.41 V (0.06%) | 17.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.19 V (0.03%) | 689.8 V | 0.31 V (0.04%) | 12.8 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 50 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 40A at 50 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 6 mm² copper cable for 40A over 50m at 690V (voltage drop: 12.36V or 1.79%).
What is the power capacity of 40A at 690V?
At unity power factor, 40A at 690V supports 47.8 kW with a standard 40A circuit breaker.
Related Lengths & Currents (690V)
40A · 5m (690V)40A · 10m (690V)40A · 15m (690V)40A · 20m (690V)40A · 25m (690V)40A · 30m (690V)40A · 35m (690V)40A · 40m (690V)40A · 45m (690V)40A · 60m (690V)40A · 70m (690V)10A · 50m (690V)16A · 50m (690V)20A · 50m (690V)25A · 50m (690V)32A · 50m (690V)50A · 50m (690V)63A · 50m (690V)80A · 50m (690V)100A · 50m (690V)125A · 50m (690V)160A · 50m (690V)200A · 50m (690V)