25 Amp Cable Size at 250 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 250 m (820.2 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 14.48V (2.1%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 15.29V (2.22%)
Voltage at Load675.5 VLine Loss: 627.0 W
Max Power & Breaker29.88 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A 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 | 154.44 V (22.38%) | 535.6 V | 254.76 V (36.92%) | 6687.5 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 92.66 V (13.43%) | 597.3 V | 152.85 V (22.15%) | 4012.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 57.92 V (8.39%) | 632.1 V | 95.53 V (13.85%) | 2507.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 38.61 V (5.6%) | 651.4 V | 63.69 V (9.23%) | 1671.9 W | Drop High |
| 10 mm² | 57 A | 44 A | 23.17 V (3.36%) | 666.8 V | 38.21 V (5.54%) | 1003.1 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 14.48 V (2.1%) | 675.5 V | 23.88 V (3.46%) | 627.0 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 9.27 V (1.34%) | 680.7 V | 15.29 V (2.22%) | 401.2 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 6.62 V (0.96%) | 683.4 V | 10.92 V (1.58%) | 286.6 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 4.63 V (0.67%) | 685.4 V | 7.64 V (1.11%) | 200.6 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.31 V (0.48%) | 686.7 V | 5.46 V (0.79%) | 143.3 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.44 V (0.35%) | 687.6 V | 4.02 V (0.58%) | 105.6 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.93 V (0.28%) | 688.1 V | 3.18 V (0.46%) | 83.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.54 V (0.22%) | 688.5 V | 2.55 V (0.37%) | 66.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.25 V (0.18%) | 688.7 V | 2.07 V (0.3%) | 54.2 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.97 V (0.14%) | 689.0 V | 1.59 V (0.23%) | 41.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.77 V (0.11%) | 689.2 V | 1.27 V (0.18%) | 33.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.58 V (0.08%) | 689.4 V | 0.96 V (0.14%) | 25.1 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 25A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 25A over 250m at 690V (voltage drop: 14.48V or 2.1%).
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 · 50m (690V)25A · 60m (690V)25A · 70m (690V)10A · 250m (690V)16A · 250m (690V)20A · 250m (690V)32A · 250m (690V)40A · 250m (690V)50A · 250m (690V)63A · 250m (690V)80A · 250m (690V)100A · 250m (690V)125A · 250m (690V)160A · 250m (690V)200A · 250m (690V)