30 Amp Cable Size at 25 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 30 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 6.95V (1.01%)
Aluminum Cable (≤3% Drop)6 mm²Drop: 7.64V (1.11%)
Voltage at Load683.1 VLine Loss: 361.1 W
Max Power & Breaker35.85 kW30A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 30A at 25m
| 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 | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 963.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 577.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 6.95 V (1.01%) | 683.1 V | 11.46 V (1.66%) | 361.1 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 4.63 V (0.67%) | 685.4 V | 7.64 V (1.11%) | 240.7 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 2.78 V (0.4%) | 687.2 V | 4.59 V (0.66%) | 144.4 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 1.74 V (0.25%) | 688.3 V | 2.87 V (0.42%) | 90.3 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.11 V (0.16%) | 688.9 V | 1.83 V (0.27%) | 57.8 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.79 V (0.12%) | 689.2 V | 1.31 V (0.19%) | 41.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.56 V (0.08%) | 689.4 V | 0.92 V (0.13%) | 28.9 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.4 V (0.06%) | 689.6 V | 0.66 V (0.09%) | 20.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.29 V (0.04%) | 689.7 V | 0.48 V (0.07%) | 15.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.23 V (0.03%) | 689.8 V | 0.38 V (0.06%) | 12.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.19 V (0.03%) | 689.8 V | 0.31 V (0.04%) | 9.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.15 V (0.02%) | 689.8 V | 0.25 V (0.04%) | 7.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.12 V (0.02%) | 689.9 V | 0.19 V (0.03%) | 6.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.09 V (0.01%) | 689.9 V | 0.15 V (0.02%) | 4.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.07 V (0.01%) | 689.9 V | 0.11 V (0.02%) | 3.6 W | ✓ OK (≤3%) |
FAQ — 30 Amp Cable Size at 25 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 30A at 25 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 30A over 25m at 690V (voltage drop: 6.95V or 1.01%).
What is the power capacity of 30A at 690V?
At unity power factor, 30A at 690V supports 35.85 kW with a standard 30A circuit breaker.
Related Lengths & Currents (690V)
30A · 5m (690V)30A · 10m (690V)30A · 15m (690V)30A · 20m (690V)30A · 30m (690V)30A · 35m (690V)30A · 40m (690V)30A · 45m (690V)30A · 50m (690V)30A · 60m (690V)30A · 70m (690V)10A · 25m (690V)16A · 25m (690V)20A · 25m (690V)25A · 25m (690V)32A · 25m (690V)40A · 25m (690V)50A · 25m (690V)63A · 25m (690V)80A · 25m (690V)100A · 25m (690V)125A · 25m (690V)160A · 25m (690V)200A · 25m (690V)