25 Amp Cable Size at 50 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 50 m (164.0 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 11.58V (2.79%)
Aluminum Cable (≤3% Drop)10 mm²Drop: 7.64V (1.84%)
Voltage at Load403.4 VLine Loss: 501.6 W
Max Power & Breaker17.97 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A at 50m
| 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 | 30.89 V (7.44%) | 384.1 V | 50.95 V (12.28%) | 1337.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 18.53 V (4.47%) | 396.5 V | 30.57 V (7.37%) | 802.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 11.58 V (2.79%) | 403.4 V | 19.11 V (4.6%) | 501.6 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 7.72 V (1.86%) | 407.3 V | 12.74 V (3.07%) | 334.4 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 4.63 V (1.12%) | 410.4 V | 7.64 V (1.84%) | 200.6 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.9 V (0.7%) | 412.1 V | 4.78 V (1.15%) | 125.4 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.85 V (0.45%) | 413.1 V | 3.06 V (0.74%) | 80.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.32 V (0.32%) | 413.7 V | 2.18 V (0.53%) | 57.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.93 V (0.22%) | 414.1 V | 1.53 V (0.37%) | 40.1 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.66 V (0.16%) | 414.3 V | 1.09 V (0.26%) | 28.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.49 V (0.12%) | 414.5 V | 0.8 V (0.19%) | 21.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.39 V (0.09%) | 414.6 V | 0.64 V (0.15%) | 16.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.31 V (0.07%) | 414.7 V | 0.51 V (0.12%) | 13.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.25 V (0.06%) | 414.7 V | 0.41 V (0.1%) | 10.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.19 V (0.05%) | 414.8 V | 0.32 V (0.08%) | 8.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.15 V (0.04%) | 414.8 V | 0.25 V (0.06%) | 6.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.12 V (0.03%) | 414.9 V | 0.19 V (0.05%) | 5.0 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 50 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 25A at 50 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 25A over 50m at 415V (voltage drop: 11.58V or 2.79%).
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 · 60m (415V)25A · 70m (415V)10A · 50m (415V)16A · 50m (415V)20A · 50m (415V)32A · 50m (415V)40A · 50m (415V)50A · 50m (415V)63A · 50m (415V)80A · 50m (415V)100A · 50m (415V)125A · 50m (415V)160A · 50m (415V)200A · 50m (415V)