300 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 300 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 1.85V (0.27%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 1.91V (0.28%)
Voltage at Load688.1 VLine Loss: 963.0 W
Max Power & Breaker358.53 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A 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 | 185.33 V (26.86%) | 504.7 V | 305.71 V (44.31%) | 96300.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 111.2 V (16.12%) | 578.8 V | 183.42 V (26.58%) | 57780.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 69.5 V (10.07%) | 620.5 V | 114.64 V (16.61%) | 36112.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 46.33 V (6.71%) | 643.7 V | 76.43 V (11.08%) | 24075.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 27.8 V (4.03%) | 662.2 V | 45.86 V (6.65%) | 14445.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 17.37 V (2.52%) | 672.6 V | 28.66 V (4.15%) | 9028.1 W | Drop High |
| 25 mm² | 101 A | 78 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 5778.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 7.94 V (1.15%) | 682.1 V | 13.1 V (1.9%) | 4127.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 5.56 V (0.81%) | 684.4 V | 9.17 V (1.33%) | 2889.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 3.97 V (0.58%) | 686.0 V | 6.55 V (0.95%) | 2063.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 2.93 V (0.42%) | 687.1 V | 4.83 V (0.7%) | 1520.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.32 V (0.34%) | 687.7 V | 3.82 V (0.55%) | 1203.7 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.85 V (0.27%) | 688.1 V | 3.06 V (0.44%) | 963.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.5 V (0.22%) | 688.5 V | 2.48 V (0.36%) | 780.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.16 V (0.17%) | 688.8 V | 1.91 V (0.28%) | 601.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.93 V (0.13%) | 689.1 V | 1.53 V (0.22%) | 481.5 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.69 V (0.1%) | 689.3 V | 1.15 V (0.17%) | 361.1 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 25 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 25 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 300A over 25m at 690V (voltage drop: 1.85V or 0.27%).
What is the power capacity of 300A at 690V?
At unity power factor, 300A at 690V supports 358.53 kW with a standard 300A circuit breaker.
Related Lengths & Currents (690V)
300A · 5m (690V)300A · 10m (690V)300A · 15m (690V)300A · 20m (690V)300A · 30m (690V)300A · 35m (690V)300A · 40m (690V)300A · 45m (690V)300A · 50m (690V)300A · 60m (690V)300A · 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)