325 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 325 A over 40 m (131.2 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 2.6V (0.38%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 2.65V (0.38%)
Voltage at Load687.4 VLine Loss: 1466.2 W
Max Power & Breaker388.41 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A 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 | 321.24 V (46.56%) | 368.8 V | 529.89 V (76.8%) | 180830.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 192.74 V (27.93%) | 497.3 V | 317.94 V (46.08%) | 108498.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 120.46 V (17.46%) | 569.5 V | 198.71 V (28.8%) | 67811.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 80.31 V (11.64%) | 609.7 V | 132.47 V (19.2%) | 45207.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 48.19 V (6.98%) | 641.8 V | 79.48 V (11.52%) | 27124.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 30.12 V (4.36%) | 659.9 V | 49.68 V (7.2%) | 16952.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 19.27 V (2.79%) | 670.7 V | 31.79 V (4.61%) | 10849.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 13.77 V (2.0%) | 676.2 V | 22.71 V (3.29%) | 7749.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 9.64 V (1.4%) | 680.4 V | 15.9 V (2.3%) | 5424.9 W | Drop High |
| 70 mm² | 192 A | 150 A | 6.88 V (1.0%) | 683.1 V | 11.35 V (1.65%) | 3874.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 5.07 V (0.74%) | 684.9 V | 8.37 V (1.21%) | 2855.2 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.02 V (0.58%) | 686.0 V | 6.62 V (0.96%) | 2260.4 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.21 V (0.47%) | 686.8 V | 5.3 V (0.77%) | 1808.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.6 V (0.38%) | 687.4 V | 4.3 V (0.62%) | 1466.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 2.01 V (0.29%) | 688.0 V | 3.31 V (0.48%) | 1130.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.61 V (0.23%) | 688.4 V | 2.65 V (0.38%) | 904.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.2 V (0.17%) | 688.8 V | 1.99 V (0.29%) | 678.1 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 40 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 325A at 40 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 40m at 690V (voltage drop: 2.6V or 0.38%).
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 · 45m (690V)325A · 50m (690V)325A · 60m (690V)325A · 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)