25 Amp Cable Size at 50 Meters (690V Three-Phase (Wind / Heavy 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 (1.68%)
Aluminum Cable (≤3% Drop)4 mm²Drop: 19.11V (2.77%)
Voltage at Load678.4 VLine Loss: 501.6 W
Max Power & Breaker29.88 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 (4.48%) | 659.1 V | 50.95 V (7.38%) | 1337.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 802.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 11.58 V (1.68%) | 678.4 V | 19.11 V (2.77%) | 501.6 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 7.72 V (1.12%) | 682.3 V | 12.74 V (1.85%) | 334.4 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 4.63 V (0.67%) | 685.4 V | 7.64 V (1.11%) | 200.6 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.9 V (0.42%) | 687.1 V | 4.78 V (0.69%) | 125.4 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.85 V (0.27%) | 688.1 V | 3.06 V (0.44%) | 80.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.32 V (0.19%) | 688.7 V | 2.18 V (0.32%) | 57.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.93 V (0.13%) | 689.1 V | 1.53 V (0.22%) | 40.1 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.66 V (0.1%) | 689.3 V | 1.09 V (0.16%) | 28.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.49 V (0.07%) | 689.5 V | 0.8 V (0.12%) | 21.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.39 V (0.06%) | 689.6 V | 0.64 V (0.09%) | 16.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.31 V (0.04%) | 689.7 V | 0.51 V (0.07%) | 13.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.25 V (0.04%) | 689.7 V | 0.41 V (0.06%) | 10.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.19 V (0.03%) | 689.8 V | 0.32 V (0.05%) | 8.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.15 V (0.02%) | 689.8 V | 0.25 V (0.04%) | 6.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.12 V (0.02%) | 689.9 V | 0.19 V (0.03%) | 5.0 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 50 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 25A at 50 meters (690V)?
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 690V (voltage drop: 11.58V or 1.68%).
What is the power capacity of 25A at 690V?
At unity power factor, 25A at 690V supports 29.88 kW with a standard 25A circuit breaker.
Related Lengths & Currents (690V)
25A · 5m (690V)25A · 10m (690V)25A · 15m (690V)25A · 20m (690V)25A · 25m (690V)25A · 30m (690V)25A · 35m (690V)25A · 40m (690V)25A · 45m (690V)25A · 60m (690V)25A · 70m (690V)10A · 50m (690V)16A · 50m (690V)20A · 50m (690V)32A · 50m (690V)40A · 50m (690V)50A · 50m (690V)63A · 50m (690V)80A · 50m (690V)100A · 50m (690V)125A · 50m (690V)160A · 50m (690V)200A · 50m (690V)