325 Amp Cable Size at 250 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 250 m (820.2 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 10.04V (2.42%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 12.42V (2.99%)
Voltage at Load405.0 VLine Loss: 5650.9 W
Max Power & Breaker233.61 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 (483.79%) | 0.0 V | 3311.83 V (798.03%) | 1130187.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1204.64 V (290.28%) | 0.0 V | 1987.1 V (478.82%) | 678112.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 752.9 V (181.42%) | 0.0 V | 1241.93 V (299.26%) | 423820.3 W | Drop High |
| 6 mm² | 41 A | 32 A | 501.93 V (120.95%) | 0.0 V | 827.96 V (199.51%) | 282546.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 301.16 V (72.57%) | 113.8 V | 496.77 V (119.7%) | 169528.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 188.23 V (45.36%) | 226.8 V | 310.48 V (74.82%) | 105955.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 120.46 V (29.03%) | 294.5 V | 198.71 V (47.88%) | 67811.2 W | Drop High |
| 35 mm² | 125 A | 97 A | 86.05 V (20.73%) | 329.0 V | 141.94 V (34.2%) | 48436.6 W | Drop High |
| 50 mm² | 151 A | 118 A | 60.23 V (14.51%) | 354.8 V | 99.35 V (23.94%) | 33905.6 W | Drop High |
| 70 mm² | 192 A | 150 A | 43.02 V (10.37%) | 372.0 V | 70.97 V (17.1%) | 24218.3 W | Drop High |
| 95 mm² | 232 A | 181 A | 31.7 V (7.64%) | 383.3 V | 52.29 V (12.6%) | 17845.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 25.1 V (6.05%) | 389.9 V | 41.4 V (9.98%) | 14127.3 W | Drop High |
| 150 mm² | 309 A | 241 A | 20.08 V (4.84%) | 394.9 V | 33.12 V (7.98%) | 11301.9 W | Drop High |
| 185 mm² | 353 A | 275 A | 16.28 V (3.92%) | 398.7 V | 26.85 V (6.47%) | 9163.7 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 12.55 V (3.02%) | 402.5 V | 20.7 V (4.99%) | 7063.7 W | ~ ≤5% |
| 300 mm² | 477 A | 372 A | 10.04 V (2.42%) | 405.0 V | 16.56 V (3.99%) | 5650.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 7.53 V (1.81%) | 407.5 V | 12.42 V (2.99%) | 4238.2 W | ✓ OK (≤3%) |
FAQ — 325 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 325A at 250 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 325A over 250m at 415V (voltage drop: 10.04V or 2.42%).
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 · 40m (415V)325A · 45m (415V)325A · 50m (415V)325A · 60m (415V)325A · 70m (415V)10A · 250m (415V)16A · 250m (415V)20A · 250m (415V)25A · 250m (415V)32A · 250m (415V)40A · 250m (415V)50A · 250m (415V)63A · 250m (415V)80A · 250m (415V)100A · 250m (415V)125A · 250m (415V)160A · 250m (415V)200A · 250m (415V)