325 Amp Cable Size at 40 Meters (415V Three-Phase (UK / Australia 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 (0.63%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 2.65V (0.64%)
Voltage at Load412.4 VLine Loss: 1466.2 W
Max Power & Breaker233.61 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 (77.41%) | 93.8 V | 529.89 V (127.68%) | 180830.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 192.74 V (46.44%) | 222.3 V | 317.94 V (76.61%) | 108498.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 120.46 V (29.03%) | 294.5 V | 198.71 V (47.88%) | 67811.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 80.31 V (19.35%) | 334.7 V | 132.47 V (31.92%) | 45207.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 48.19 V (11.61%) | 366.8 V | 79.48 V (19.15%) | 27124.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 30.12 V (7.26%) | 384.9 V | 49.68 V (11.97%) | 16952.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 19.27 V (4.64%) | 395.7 V | 31.79 V (7.66%) | 10849.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 13.77 V (3.32%) | 401.2 V | 22.71 V (5.47%) | 7749.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 9.64 V (2.32%) | 405.4 V | 15.9 V (3.83%) | 5424.9 W | Drop High |
| 70 mm² | 192 A | 150 A | 6.88 V (1.66%) | 408.1 V | 11.35 V (2.74%) | 3874.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 5.07 V (1.22%) | 409.9 V | 8.37 V (2.02%) | 2855.2 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.02 V (0.97%) | 411.0 V | 6.62 V (1.6%) | 2260.4 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.21 V (0.77%) | 411.8 V | 5.3 V (1.28%) | 1808.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 2.6 V (0.63%) | 412.4 V | 4.3 V (1.04%) | 1466.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 2.01 V (0.48%) | 413.0 V | 3.31 V (0.8%) | 1130.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.61 V (0.39%) | 413.4 V | 2.65 V (0.64%) | 904.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.2 V (0.29%) | 413.8 V | 1.99 V (0.48%) | 678.1 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 40 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 325A at 40 meters (415V)?
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 415V (voltage drop: 2.6V or 0.63%).
What is the power capacity of 325A at 415V?
At unity power factor, 325A at 415V supports 233.61 kW with a standard 350A circuit breaker.
Related Lengths & Currents (415V)
325A · 5m (415V)325A · 10m (415V)325A · 15m (415V)325A · 20m (415V)325A · 25m (415V)325A · 30m (415V)325A · 35m (415V)325A · 45m (415V)325A · 50m (415V)325A · 60m (415V)325A · 70m (415V)10A · 40m (415V)16A · 40m (415V)20A · 40m (415V)25A · 40m (415V)32A · 40m (415V)40A · 40m (415V)50A · 40m (415V)63A · 40m (415V)80A · 40m (415V)100A · 40m (415V)125A · 40m (415V)160A · 40m (415V)200A · 40m (415V)