90 Amp Cable Size at 20 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 90 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 2.67V (0.39%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 3.14V (0.46%)
Voltage at Load687.3 VLine Loss: 416.0 W
Max Power & Breaker107.56 kW90A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 90A at 20m
| 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 | 44.48 V (6.45%) | 645.5 V | 73.37 V (10.63%) | 6933.6 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 26.69 V (3.87%) | 663.3 V | 44.02 V (6.38%) | 4160.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 16.68 V (2.42%) | 673.3 V | 27.51 V (3.99%) | 2600.1 W | Drop High |
| 6 mm² | 41 A | 32 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 1733.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 6.67 V (0.97%) | 683.3 V | 11.01 V (1.59%) | 1040.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 4.17 V (0.6%) | 685.8 V | 6.88 V (1.0%) | 650.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 2.67 V (0.39%) | 687.3 V | 4.4 V (0.64%) | 416.0 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.91 V (0.28%) | 688.1 V | 3.14 V (0.46%) | 297.2 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.33 V (0.19%) | 688.7 V | 2.2 V (0.32%) | 208.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.95 V (0.14%) | 689.0 V | 1.57 V (0.23%) | 148.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.7 V (0.1%) | 689.3 V | 1.16 V (0.17%) | 109.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.56 V (0.08%) | 689.4 V | 0.92 V (0.13%) | 86.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.44 V (0.06%) | 689.6 V | 0.73 V (0.11%) | 69.3 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.36 V (0.05%) | 689.6 V | 0.59 V (0.09%) | 56.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.28 V (0.04%) | 689.7 V | 0.46 V (0.07%) | 43.3 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.22 V (0.03%) | 689.8 V | 0.37 V (0.05%) | 34.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.17 V (0.02%) | 689.8 V | 0.28 V (0.04%) | 26.0 W | ✓ OK (≤3%) |
FAQ — 90 Amp Cable Size at 20 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 90A at 20 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 90A over 20m at 690V (voltage drop: 2.67V or 0.39%).
What is the power capacity of 90A at 690V?
At unity power factor, 90A at 690V supports 107.56 kW with a standard 90A circuit breaker.
Related Lengths & Currents (690V)
90A · 5m (690V)90A · 10m (690V)90A · 15m (690V)90A · 25m (690V)90A · 30m (690V)90A · 35m (690V)90A · 40m (690V)90A · 45m (690V)90A · 50m (690V)90A · 60m (690V)90A · 70m (690V)10A · 20m (690V)16A · 20m (690V)20A · 20m (690V)25A · 20m (690V)32A · 20m (690V)40A · 20m (690V)50A · 20m (690V)63A · 20m (690V)80A · 20m (690V)100A · 20m (690V)125A · 20m (690V)160A · 20m (690V)200A · 20m (690V)