45 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 45 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 11.91V (2.87%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 9.83V (2.37%)
Voltage at Load403.1 VLine Loss: 928.6 W
Max Power & Breaker32.35 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A 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 | 277.99 V (66.99%) | 137.0 V | 458.56 V (110.5%) | 21667.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 166.8 V (40.19%) | 248.2 V | 275.14 V (66.3%) | 13000.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 104.25 V (25.12%) | 310.8 V | 171.96 V (41.44%) | 8125.3 W | Drop High |
| 6 mm² | 41 A | 32 A | 69.5 V (16.75%) | 345.5 V | 114.64 V (27.62%) | 5416.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 41.7 V (10.05%) | 373.3 V | 68.78 V (16.57%) | 3250.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 26.06 V (6.28%) | 388.9 V | 42.99 V (10.36%) | 2031.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 16.68 V (4.02%) | 398.3 V | 27.51 V (6.63%) | 1300.0 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 11.91 V (2.87%) | 403.1 V | 19.65 V (4.74%) | 928.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 8.34 V (2.01%) | 406.7 V | 13.76 V (3.31%) | 650.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 5.96 V (1.44%) | 409.0 V | 9.83 V (2.37%) | 464.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 4.39 V (1.06%) | 410.6 V | 7.24 V (1.74%) | 342.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.47 V (0.84%) | 411.5 V | 5.73 V (1.38%) | 270.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.78 V (0.67%) | 412.2 V | 4.59 V (1.1%) | 216.7 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.25 V (0.54%) | 412.7 V | 3.72 V (0.9%) | 175.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.74 V (0.42%) | 413.3 V | 2.87 V (0.69%) | 135.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.39 V (0.33%) | 413.6 V | 2.29 V (0.55%) | 108.3 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.04 V (0.25%) | 414.0 V | 1.72 V (0.41%) | 81.3 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 250 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 45A at 250 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 45A over 250m at 415V (voltage drop: 11.91V or 2.87%).
What is the power capacity of 45A at 415V?
At unity power factor, 45A at 415V supports 32.35 kW with a standard 45A circuit breaker.
Related Lengths & Currents (415V)
45A · 5m (415V)45A · 10m (415V)45A · 15m (415V)45A · 20m (415V)45A · 25m (415V)45A · 30m (415V)45A · 35m (415V)45A · 40m (415V)45A · 45m (415V)45A · 50m (415V)45A · 60m (415V)45A · 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)