900 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 900 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.83V (0.12%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.75V (0.4%)
Voltage at Load689.2 VLine Loss: 1300.0 W
Max Power & Breaker1075.6 kW1000A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 900A 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 | 444.79 V (64.46%) | 245.2 V | 733.7 V (106.33%) | 693360.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 266.87 V (38.68%) | 423.1 V | 440.22 V (63.8%) | 416016.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 166.8 V (24.17%) | 523.2 V | 275.14 V (39.87%) | 260010.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 111.2 V (16.12%) | 578.8 V | 183.42 V (26.58%) | 173340.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 66.72 V (9.67%) | 623.3 V | 110.05 V (15.95%) | 104004.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 41.7 V (6.04%) | 648.3 V | 68.78 V (9.97%) | 65002.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 26.69 V (3.87%) | 663.3 V | 44.02 V (6.38%) | 41601.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 19.06 V (2.76%) | 670.9 V | 31.44 V (4.56%) | 29715.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 13.34 V (1.93%) | 676.7 V | 22.01 V (3.19%) | 20800.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 9.53 V (1.38%) | 680.5 V | 15.72 V (2.28%) | 14857.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 7.02 V (1.02%) | 683.0 V | 11.58 V (1.68%) | 10947.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 5.56 V (0.81%) | 684.4 V | 9.17 V (1.33%) | 8667.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 4.45 V (0.64%) | 685.6 V | 7.34 V (1.06%) | 6933.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.61 V (0.52%) | 686.4 V | 5.95 V (0.86%) | 5621.8 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.78 V (0.4%) | 687.2 V | 4.59 V (0.66%) | 4333.5 W | Drop High |
| 300 mm² | 477 A | 372 A | 2.22 V (0.32%) | 687.8 V | 3.67 V (0.53%) | 3466.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.67 V (0.24%) | 688.3 V | 2.75 V (0.4%) | 2600.1 W | Drop High |
FAQ — 900 Amp Cable Size at 20 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 900A at 20 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 900A over 20m at 690V (voltage drop: 0.83V or 0.12%).
What is the power capacity of 900A at 690V?
At unity power factor, 900A at 690V supports 1075.6 kW with a standard 1000A circuit breaker.
Related Lengths & Currents (690V)
900A · 5m (690V)900A · 10m (690V)900A · 15m (690V)900A · 25m (690V)900A · 30m (690V)900A · 35m (690V)900A · 40m (690V)900A · 45m (690V)900A · 50m (690V)900A · 60m (690V)900A · 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)