40 Amp Cable Size at 90 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 90 m (295.3 ft).
Copper Cable (≤3% Drop)10 mm²Drop: 13.34V (1.93%)
Aluminum Cable (≤3% Drop)16 mm²Drop: 13.76V (1.99%)
Voltage at Load676.7 VLine Loss: 924.5 W
Max Power & Breaker47.8 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 90m
| 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 | 88.96 V (12.89%) | 601.0 V | 146.74 V (21.27%) | 6163.2 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 53.37 V (7.74%) | 636.6 V | 88.04 V (12.76%) | 3697.9 W | Drop High |
| 4 mm² | 32 A | 25 A | 33.36 V (4.83%) | 656.6 V | 55.03 V (7.97%) | 2311.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 22.24 V (3.22%) | 667.8 V | 36.68 V (5.32%) | 1540.8 W | ~ ≤5% |
| 10 mm² | 57 A | 44 A | 13.34 V (1.93%) | 676.7 V | 22.01 V (3.19%) | 924.5 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 8.34 V (1.21%) | 681.7 V | 13.76 V (1.99%) | 577.8 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 5.34 V (0.77%) | 684.7 V | 8.8 V (1.28%) | 369.8 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 3.81 V (0.55%) | 686.2 V | 6.29 V (0.91%) | 264.1 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 2.67 V (0.39%) | 687.3 V | 4.4 V (0.64%) | 184.9 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.91 V (0.28%) | 688.1 V | 3.14 V (0.46%) | 132.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 1.4 V (0.2%) | 688.6 V | 2.32 V (0.34%) | 97.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.11 V (0.16%) | 688.9 V | 1.83 V (0.27%) | 77.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.89 V (0.13%) | 689.1 V | 1.47 V (0.21%) | 61.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.72 V (0.1%) | 689.3 V | 1.19 V (0.17%) | 50.0 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.56 V (0.08%) | 689.4 V | 0.92 V (0.13%) | 38.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.44 V (0.06%) | 689.6 V | 0.73 V (0.11%) | 30.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.33 V (0.05%) | 689.7 V | 0.55 V (0.08%) | 23.1 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 90 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 40A at 90 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 90m at 690V (voltage drop: 13.34V or 1.93%).
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 · 90m (690V)16A · 90m (690V)20A · 90m (690V)25A · 90m (690V)32A · 90m (690V)50A · 90m (690V)63A · 90m (690V)80A · 90m (690V)100A · 90m (690V)125A · 90m (690V)160A · 90m (690V)200A · 90m (690V)