25 Amp Cable Size at 300 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 25 A over 300 m (984.3 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 11.12V (2.68%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 9.17V (2.21%)
Voltage at Load403.9 VLine Loss: 481.5 W
Max Power & Breaker17.97 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A at 300m
| 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 | 185.33 V (44.66%) | 229.7 V | 305.71 V (73.66%) | 8025.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 111.2 V (26.79%) | 303.8 V | 183.42 V (44.2%) | 4815.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 69.5 V (16.75%) | 345.5 V | 114.64 V (27.62%) | 3009.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 46.33 V (11.16%) | 368.7 V | 76.43 V (18.42%) | 2006.3 W | Drop High |
| 10 mm² | 57 A | 44 A | 27.8 V (6.7%) | 387.2 V | 45.86 V (11.05%) | 1203.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 17.37 V (4.19%) | 397.6 V | 28.66 V (6.91%) | 752.3 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 11.12 V (2.68%) | 403.9 V | 18.34 V (4.42%) | 481.5 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 7.94 V (1.91%) | 407.1 V | 13.1 V (3.16%) | 343.9 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 5.56 V (1.34%) | 409.4 V | 9.17 V (2.21%) | 240.7 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.97 V (0.96%) | 411.0 V | 6.55 V (1.58%) | 172.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.93 V (0.71%) | 412.1 V | 4.83 V (1.16%) | 126.7 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 2.32 V (0.56%) | 412.7 V | 3.82 V (0.92%) | 100.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.85 V (0.45%) | 413.1 V | 3.06 V (0.74%) | 80.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.5 V (0.36%) | 413.5 V | 2.48 V (0.6%) | 65.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.16 V (0.28%) | 413.8 V | 1.91 V (0.46%) | 50.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.93 V (0.22%) | 414.1 V | 1.53 V (0.37%) | 40.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.69 V (0.17%) | 414.3 V | 1.15 V (0.28%) | 30.1 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 300 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 25A at 300 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 25A over 300m at 415V (voltage drop: 11.12V or 2.68%).
What is the power capacity of 25A at 415V?
At unity power factor, 25A at 415V supports 17.97 kW with a standard 25A circuit breaker.
Related Lengths & Currents (415V)
25A · 5m (415V)25A · 10m (415V)25A · 15m (415V)25A · 20m (415V)25A · 25m (415V)25A · 30m (415V)25A · 35m (415V)25A · 40m (415V)25A · 45m (415V)25A · 50m (415V)25A · 60m (415V)25A · 70m (415V)10A · 300m (415V)16A · 300m (415V)20A · 300m (415V)32A · 300m (415V)40A · 300m (415V)50A · 300m (415V)63A · 300m (415V)80A · 300m (415V)100A · 300m (415V)125A · 300m (415V)160A · 300m (415V)200A · 300m (415V)