325 Amp Cable Size at 250 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 250 m (820.2 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 16.28V (2.36%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 16.56V (2.4%)
Voltage at Load673.7 VLine Loss: 9163.7 W
Max Power & Breaker388.41 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 250m
| 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 | 2007.74 V (290.98%) | 0.0 V | 3311.83 V (479.97%) | 1130187.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1204.64 V (174.59%) | 0.0 V | 1987.1 V (287.98%) | 678112.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 752.9 V (109.12%) | 0.0 V | 1241.93 V (179.99%) | 423820.3 W | Drop High |
| 6 mm² | 41 A | 32 A | 501.93 V (72.74%) | 188.1 V | 827.96 V (119.99%) | 282546.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 301.16 V (43.65%) | 388.8 V | 496.77 V (72.0%) | 169528.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 188.23 V (27.28%) | 501.8 V | 310.48 V (45.0%) | 105955.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 120.46 V (17.46%) | 569.5 V | 198.71 V (28.8%) | 67811.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 86.05 V (12.47%) | 604.0 V | 141.94 V (20.57%) | 48436.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 60.23 V (8.73%) | 629.8 V | 99.35 V (14.4%) | 33905.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 43.02 V (6.24%) | 647.0 V | 70.97 V (10.29%) | 24218.3 W | Drop High |
| 95 mm² | 232 A | 181 A | 31.7 V (4.59%) | 658.3 V | 52.29 V (7.58%) | 17845.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 25.1 V (3.64%) | 664.9 V | 41.4 V (6.0%) | 14127.3 W | Drop High |
| 150 mm² | 309 A | 241 A | 20.08 V (2.91%) | 669.9 V | 33.12 V (4.8%) | 11301.9 W | Drop High |
| 185 mm² | 353 A | 275 A | 16.28 V (2.36%) | 673.7 V | 26.85 V (3.89%) | 9163.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 12.55 V (1.82%) | 677.5 V | 20.7 V (3.0%) | 7063.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 10.04 V (1.45%) | 680.0 V | 16.56 V (2.4%) | 5650.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 7.53 V (1.09%) | 682.5 V | 12.42 V (1.8%) | 4238.2 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 325A at 250 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 250m at 690V (voltage drop: 16.28V or 2.36%).
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 · 25m (690V)325A · 30m (690V)325A · 35m (690V)325A · 40m (690V)325A · 45m (690V)325A · 50m (690V)325A · 60m (690V)325A · 70m (690V)10A · 250m (690V)16A · 250m (690V)20A · 250m (690V)25A · 250m (690V)32A · 250m (690V)40A · 250m (690V)50A · 250m (690V)63A · 250m (690V)80A · 250m (690V)100A · 250m (690V)125A · 250m (690V)160A · 250m (690V)200A · 250m (690V)