325 Amp Cable Size at 25 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 325 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 1.63V (0.24%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 1.66V (0.24%)
Voltage at Load688.4 VLine Loss: 916.4 W
Max Power & Breaker388.41 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 25m
| 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 | 200.77 V (29.1%) | 489.2 V | 331.18 V (48.0%) | 113018.7 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 120.46 V (17.46%) | 569.5 V | 198.71 V (28.8%) | 67811.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 75.29 V (10.91%) | 614.7 V | 124.19 V (18.0%) | 42382.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 50.19 V (7.27%) | 639.8 V | 82.8 V (12.0%) | 28254.7 W | Drop High |
| 10 mm² | 57 A | 44 A | 30.12 V (4.36%) | 659.9 V | 49.68 V (7.2%) | 16952.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 18.82 V (2.73%) | 671.2 V | 31.05 V (4.5%) | 10595.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 12.05 V (1.75%) | 678.0 V | 19.87 V (2.88%) | 6781.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 8.6 V (1.25%) | 681.4 V | 14.19 V (2.06%) | 4843.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 6.02 V (0.87%) | 684.0 V | 9.94 V (1.44%) | 3390.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 4.3 V (0.62%) | 685.7 V | 7.1 V (1.03%) | 2421.8 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.17 V (0.46%) | 686.8 V | 5.23 V (0.76%) | 1784.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.51 V (0.36%) | 687.5 V | 4.14 V (0.6%) | 1412.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.01 V (0.29%) | 688.0 V | 3.31 V (0.48%) | 1130.2 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.63 V (0.24%) | 688.4 V | 2.69 V (0.39%) | 916.4 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.25 V (0.18%) | 688.7 V | 2.07 V (0.3%) | 706.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.0 V (0.15%) | 689.0 V | 1.66 V (0.24%) | 565.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.75 V (0.11%) | 689.2 V | 1.24 V (0.18%) | 423.8 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 25 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 325A at 25 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 185 mm² copper cable for 325A over 25m at 690V (voltage drop: 1.63V or 0.24%).
What is the power capacity of 325A at 690V?
At unity power factor, 325A at 690V supports 388.41 kW with a standard 350A circuit breaker.
Related Lengths & Currents (690V)
325A · 5m (690V)325A · 10m (690V)325A · 15m (690V)325A · 20m (690V)325A · 30m (690V)325A · 35m (690V)325A · 40m (690V)325A · 45m (690V)325A · 50m (690V)325A · 60m (690V)325A · 70m (690V)10A · 25m (690V)16A · 25m (690V)20A · 25m (690V)25A · 25m (690V)32A · 25m (690V)40A · 25m (690V)50A · 25m (690V)63A · 25m (690V)80A · 25m (690V)100A · 25m (690V)125A · 25m (690V)160A · 25m (690V)200A · 25m (690V)