325 Amp Cable Size at 20 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 20 m (65.6 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 1.3V (0.31%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 1.32V (0.32%)
Voltage at Load413.7 VLine Loss: 733.1 W
Max Power & Breaker233.61 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 325A at 20m
| 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 | 160.62 V (38.7%) | 254.4 V | 264.95 V (63.84%) | 90415.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 96.37 V (23.22%) | 318.6 V | 158.97 V (38.31%) | 54249.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 60.23 V (14.51%) | 354.8 V | 99.35 V (23.94%) | 33905.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 40.15 V (9.68%) | 374.8 V | 66.24 V (15.96%) | 22603.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 24.09 V (5.81%) | 390.9 V | 39.74 V (9.58%) | 13562.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 15.06 V (3.63%) | 399.9 V | 24.84 V (5.99%) | 8476.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 9.64 V (2.32%) | 405.4 V | 15.9 V (3.83%) | 5424.9 W | Drop High |
| 35 mm² | 125 A | 97 A | 6.88 V (1.66%) | 408.1 V | 11.35 V (2.74%) | 3874.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 4.82 V (1.16%) | 410.2 V | 7.95 V (1.92%) | 2712.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.44 V (0.83%) | 411.6 V | 5.68 V (1.37%) | 1937.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.54 V (0.61%) | 412.5 V | 4.18 V (1.01%) | 1427.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.01 V (0.48%) | 413.0 V | 3.31 V (0.8%) | 1130.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.61 V (0.39%) | 413.4 V | 2.65 V (0.64%) | 904.1 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.3 V (0.31%) | 413.7 V | 2.15 V (0.52%) | 733.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.0 V (0.24%) | 414.0 V | 1.66 V (0.4%) | 565.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.8 V (0.19%) | 414.2 V | 1.32 V (0.32%) | 452.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.6 V (0.15%) | 414.4 V | 0.99 V (0.24%) | 339.1 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 20 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 325A at 20 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 20m at 415V (voltage drop: 1.3V or 0.31%).
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 · 25m (415V)325A · 30m (415V)325A · 35m (415V)325A · 40m (415V)325A · 45m (415V)325A · 50m (415V)325A · 60m (415V)325A · 70m (415V)10A · 20m (415V)16A · 20m (415V)20A · 20m (415V)25A · 20m (415V)32A · 20m (415V)40A · 20m (415V)50A · 20m (415V)63A · 20m (415V)80A · 20m (415V)100A · 20m (415V)125A · 20m (415V)160A · 20m (415V)200A · 20m (415V)