325 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 325 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 4.56V (0.66%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 4.64V (0.67%)
Voltage at Load685.4 VLine Loss: 2565.8 W
Max Power & Breaker388.41 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A 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 | 562.17 V (81.47%) | 127.8 V | 927.31 V (134.39%) | 316452.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 337.3 V (48.88%) | 352.7 V | 556.39 V (80.64%) | 189871.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 210.81 V (30.55%) | 479.2 V | 347.74 V (50.4%) | 118669.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 140.54 V (20.37%) | 549.5 V | 231.83 V (33.6%) | 79113.1 W | Drop High |
| 10 mm² | 57 A | 44 A | 84.32 V (12.22%) | 605.7 V | 139.1 V (20.16%) | 47467.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 52.7 V (7.64%) | 637.3 V | 86.94 V (12.6%) | 29667.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 33.73 V (4.89%) | 656.3 V | 55.64 V (8.06%) | 18987.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 24.09 V (3.49%) | 665.9 V | 39.74 V (5.76%) | 13562.2 W | Drop High |
| 50 mm² | 151 A | 118 A | 16.86 V (2.44%) | 673.1 V | 27.82 V (4.03%) | 9493.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 12.05 V (1.75%) | 678.0 V | 19.87 V (2.88%) | 6781.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 8.88 V (1.29%) | 681.1 V | 14.64 V (2.12%) | 4996.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 7.03 V (1.02%) | 683.0 V | 11.59 V (1.68%) | 3955.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 5.62 V (0.81%) | 684.4 V | 9.27 V (1.34%) | 3164.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 4.56 V (0.66%) | 685.4 V | 7.52 V (1.09%) | 2565.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 3.51 V (0.51%) | 686.5 V | 5.8 V (0.84%) | 1977.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 2.81 V (0.41%) | 687.2 V | 4.64 V (0.67%) | 1582.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 2.11 V (0.31%) | 687.9 V | 3.48 V (0.5%) | 1186.7 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 70 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 325A at 70 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 70m at 690V (voltage drop: 4.56V or 0.66%).
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)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)