425 Amp Cable Size at 40 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 40 m (131.2 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 2.1V (0.3%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.6V (0.38%)
Voltage at Load687.9 VLine Loss: 1546.1 W
Max Power & Breaker507.92 kW450A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 425A at 40m
| 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 | 420.08 V (60.88%) | 269.9 V | 692.94 V (100.43%) | 309230.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 252.05 V (36.53%) | 438.0 V | 415.76 V (60.26%) | 185538.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 157.53 V (22.83%) | 532.5 V | 259.85 V (37.66%) | 115961.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 105.02 V (15.22%) | 585.0 V | 173.23 V (25.11%) | 77307.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 63.01 V (9.13%) | 627.0 V | 103.94 V (15.06%) | 46384.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 39.38 V (5.71%) | 650.6 V | 64.96 V (9.41%) | 28990.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 25.2 V (3.65%) | 664.8 V | 41.58 V (6.03%) | 18553.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 18.0 V (2.61%) | 672.0 V | 29.7 V (4.3%) | 13252.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 12.6 V (1.83%) | 677.4 V | 20.79 V (3.01%) | 9276.9 W | Drop High |
| 70 mm² | 192 A | 150 A | 9.0 V (1.3%) | 681.0 V | 14.85 V (2.15%) | 6626.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 6.63 V (0.96%) | 683.4 V | 10.94 V (1.59%) | 4882.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 5.25 V (0.76%) | 684.7 V | 8.66 V (1.26%) | 3865.4 W | Drop High |
| 150 mm² | 309 A | 241 A | 4.2 V (0.61%) | 685.8 V | 6.93 V (1.0%) | 3092.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.41 V (0.49%) | 686.6 V | 5.62 V (0.81%) | 2507.3 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.63 V (0.38%) | 687.4 V | 4.33 V (0.63%) | 1932.7 W | Drop High |
| 300 mm² | 477 A | 372 A | 2.1 V (0.3%) | 687.9 V | 3.46 V (0.5%) | 1546.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.58 V (0.23%) | 688.4 V | 2.6 V (0.38%) | 1159.6 W | ✓ OK (≤3%) |
FAQ — 425 Amp Cable Size at 40 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 425A at 40 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 40m at 690V (voltage drop: 2.1V or 0.3%).
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 · 45m (690V)425A · 50m (690V)425A · 60m (690V)425A · 70m (690V)10A · 40m (690V)16A · 40m (690V)20A · 40m (690V)25A · 40m (690V)32A · 40m (690V)40A · 40m (690V)50A · 40m (690V)63A · 40m (690V)80A · 40m (690V)100A · 40m (690V)125A · 40m (690V)160A · 40m (690V)200A · 40m (690V)