300 Amp Cable Size at 15 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 300 A over 15 m (49.2 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 1.11V (0.27%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 1.15V (0.28%)
Voltage at Load413.9 VLine Loss: 577.8 W
Max Power & Breaker215.64 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A at 15m
| 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 | 111.2 V (26.79%) | 303.8 V | 183.42 V (44.2%) | 57780.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 66.72 V (16.08%) | 348.3 V | 110.05 V (26.52%) | 34668.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 41.7 V (10.05%) | 373.3 V | 68.78 V (16.57%) | 21667.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 27.8 V (6.7%) | 387.2 V | 45.86 V (11.05%) | 14445.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 16.68 V (4.02%) | 398.3 V | 27.51 V (6.63%) | 8667.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 10.42 V (2.51%) | 404.6 V | 17.2 V (4.14%) | 5416.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 6.67 V (1.61%) | 408.3 V | 11.01 V (2.65%) | 3466.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 4.77 V (1.15%) | 410.2 V | 7.86 V (1.89%) | 2476.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 3.34 V (0.8%) | 411.7 V | 5.5 V (1.33%) | 1733.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 2.38 V (0.57%) | 412.6 V | 3.93 V (0.95%) | 1238.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.76 V (0.42%) | 413.2 V | 2.9 V (0.7%) | 912.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.39 V (0.33%) | 413.6 V | 2.29 V (0.55%) | 722.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.11 V (0.27%) | 413.9 V | 1.83 V (0.44%) | 577.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.9 V (0.22%) | 414.1 V | 1.49 V (0.36%) | 468.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.69 V (0.17%) | 414.3 V | 1.15 V (0.28%) | 361.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.56 V (0.13%) | 414.4 V | 0.92 V (0.22%) | 288.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.42 V (0.1%) | 414.6 V | 0.69 V (0.17%) | 216.7 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 15 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 300A at 15 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 300A over 15m at 415V (voltage drop: 1.11V or 0.27%).
What is the power capacity of 300A at 415V?
At unity power factor, 300A at 415V supports 215.64 kW with a standard 300A circuit breaker.
Related Lengths & Currents (415V)
300A · 5m (415V)300A · 10m (415V)300A · 20m (415V)300A · 25m (415V)300A · 30m (415V)300A · 35m (415V)300A · 40m (415V)300A · 45m (415V)300A · 50m (415V)300A · 60m (415V)300A · 70m (415V)10A · 15m (415V)16A · 15m (415V)20A · 15m (415V)25A · 15m (415V)32A · 15m (415V)40A · 15m (415V)50A · 15m (415V)63A · 15m (415V)80A · 15m (415V)100A · 15m (415V)125A · 15m (415V)160A · 15m (415V)200A · 15m (415V)