425 Amp Cable Size at 70 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 425 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 3.68V (0.53%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 4.55V (0.66%)
Voltage at Load686.3 VLine Loss: 2705.8 W
Max Power & Breaker507.92 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 70m
| 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 | 735.14 V (106.54%) | 0.0 V | 1212.64 V (175.74%) | 541152.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 441.08 V (63.93%) | 248.9 V | 727.58 V (105.45%) | 324691.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 275.68 V (39.95%) | 414.3 V | 454.74 V (65.9%) | 202932.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 183.79 V (26.64%) | 506.2 V | 303.16 V (43.94%) | 135288.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 110.27 V (15.98%) | 579.7 V | 181.9 V (26.36%) | 81172.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 68.92 V (9.99%) | 621.1 V | 113.68 V (16.48%) | 50733.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 44.11 V (6.39%) | 645.9 V | 72.76 V (10.54%) | 32469.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 31.51 V (4.57%) | 658.5 V | 51.97 V (7.53%) | 23192.2 W | Drop High |
| 50 mm² | 151 A | 118 A | 22.05 V (3.2%) | 667.9 V | 36.38 V (5.27%) | 16234.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 15.75 V (2.28%) | 674.2 V | 25.99 V (3.77%) | 11596.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 11.61 V (1.68%) | 678.4 V | 19.15 V (2.77%) | 8544.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 9.19 V (1.33%) | 680.8 V | 15.16 V (2.2%) | 6764.4 W | Drop High |
| 150 mm² | 309 A | 241 A | 7.35 V (1.07%) | 682.6 V | 12.13 V (1.76%) | 5411.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 5.96 V (0.86%) | 684.0 V | 9.83 V (1.42%) | 4387.7 W | Drop High |
| 240 mm² | 415 A | 324 A | 4.59 V (0.67%) | 685.4 V | 7.58 V (1.1%) | 3382.2 W | Drop High |
| 300 mm² | 477 A | 372 A | 3.68 V (0.53%) | 686.3 V | 6.06 V (0.88%) | 2705.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 2.76 V (0.4%) | 687.2 V | 4.55 V (0.66%) | 2029.3 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 70 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 425A at 70 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 425A over 70m at 690V (voltage drop: 3.68V or 0.53%).
What is the power capacity of 425A at 690V?
At unity power factor, 425A at 690V supports 507.92 kW with a standard 450A circuit breaker.
Related Lengths & Currents (690V)
425A · 5m (690V)425A · 10m (690V)425A · 15m (690V)425A · 20m (690V)425A · 25m (690V)425A · 30m (690V)425A · 35m (690V)425A · 40m (690V)425A · 45m (690V)425A · 50m (690V)425A · 60m (690V)10A · 70m (690V)16A · 70m (690V)20A · 70m (690V)25A · 70m (690V)32A · 70m (690V)40A · 70m (690V)50A · 70m (690V)63A · 70m (690V)80A · 70m (690V)100A · 70m (690V)125A · 70m (690V)160A · 70m (690V)200A · 70m (690V)