40 Amp Cable Size at 100 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 100 m (328.1 ft).
Copper Cable (≤3% Drop)10 mm²Drop: 14.83V (2.15%)
Aluminum Cable (≤3% Drop)16 mm²Drop: 15.29V (2.22%)
Voltage at Load675.2 VLine Loss: 1027.2 W
Max Power & Breaker47.8 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 100m
| 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 | 98.84 V (14.32%) | 591.2 V | 163.04 V (23.63%) | 6848.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 59.31 V (8.59%) | 630.7 V | 97.83 V (14.18%) | 4108.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 37.07 V (5.37%) | 652.9 V | 61.14 V (8.86%) | 2568.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 24.71 V (3.58%) | 665.3 V | 40.76 V (5.91%) | 1712.0 W | ~ ≤5% |
| 10 mm² | 57 A | 44 A | 14.83 V (2.15%) | 675.2 V | 24.46 V (3.54%) | 1027.2 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 9.27 V (1.34%) | 680.7 V | 15.29 V (2.22%) | 642.0 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 5.93 V (0.86%) | 684.1 V | 9.78 V (1.42%) | 410.9 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 4.24 V (0.61%) | 685.8 V | 6.99 V (1.01%) | 293.5 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 2.97 V (0.43%) | 687.0 V | 4.89 V (0.71%) | 205.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 2.12 V (0.31%) | 687.9 V | 3.49 V (0.51%) | 146.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 1.56 V (0.23%) | 688.4 V | 2.57 V (0.37%) | 108.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.24 V (0.18%) | 688.8 V | 2.04 V (0.3%) | 85.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.99 V (0.14%) | 689.0 V | 1.63 V (0.24%) | 68.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.8 V (0.12%) | 689.2 V | 1.32 V (0.19%) | 55.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.62 V (0.09%) | 689.4 V | 1.02 V (0.15%) | 42.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.49 V (0.07%) | 689.5 V | 0.82 V (0.12%) | 34.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.37 V (0.05%) | 689.6 V | 0.61 V (0.09%) | 25.7 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 100 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 40A at 100 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 10 mm² copper cable for 40A over 100m at 690V (voltage drop: 14.83V or 2.15%).
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 · 50m (690V)40A · 60m (690V)40A · 70m (690V)10A · 100m (690V)16A · 100m (690V)20A · 100m (690V)25A · 100m (690V)32A · 100m (690V)50A · 100m (690V)63A · 100m (690V)80A · 100m (690V)100A · 100m (690V)125A · 100m (690V)160A · 100m (690V)200A · 100m (690V)