45 Amp Cable Size at 300 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 45 A over 300 m (984.3 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 20.02V (2.9%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 16.51V (2.39%)
Voltage at Load670.0 VLine Loss: 1560.1 W
Max Power & Breaker53.78 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A at 300m
| 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 | 333.59 V (48.35%) | 356.4 V | 550.27 V (79.75%) | 26001.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 200.16 V (29.01%) | 489.8 V | 330.16 V (47.85%) | 15600.6 W | Drop High |
| 4 mm² | 32 A | 25 A | 125.1 V (18.13%) | 564.9 V | 206.35 V (29.91%) | 9750.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 83.4 V (12.09%) | 606.6 V | 137.57 V (19.94%) | 6500.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 50.04 V (7.25%) | 640.0 V | 82.54 V (11.96%) | 3900.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 31.27 V (4.53%) | 658.7 V | 51.59 V (7.48%) | 2437.6 W | ~ ≤5% |
| 25 mm² | 101 A | 78 A | 20.02 V (2.9%) | 670.0 V | 33.02 V (4.78%) | 1560.1 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 14.3 V (2.07%) | 675.7 V | 23.58 V (3.42%) | 1114.3 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 10.01 V (1.45%) | 680.0 V | 16.51 V (2.39%) | 780.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 7.15 V (1.04%) | 682.9 V | 11.79 V (1.71%) | 557.2 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 5.27 V (0.76%) | 684.7 V | 8.69 V (1.26%) | 410.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 4.17 V (0.6%) | 685.8 V | 6.88 V (1.0%) | 325.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 3.34 V (0.48%) | 686.7 V | 5.5 V (0.8%) | 260.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.7 V (0.39%) | 687.3 V | 4.46 V (0.65%) | 210.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 2.08 V (0.3%) | 687.9 V | 3.44 V (0.5%) | 162.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.67 V (0.24%) | 688.3 V | 2.75 V (0.4%) | 130.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.25 V (0.18%) | 688.7 V | 2.06 V (0.3%) | 97.5 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 300 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 45A at 300 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 45A over 300m at 690V (voltage drop: 20.02V or 2.9%).
What is the power capacity of 45A at 690V?
At unity power factor, 45A at 690V supports 53.78 kW with a standard 45A circuit breaker.
Related Lengths & Currents (690V)
45A · 5m (690V)45A · 10m (690V)45A · 15m (690V)45A · 20m (690V)45A · 25m (690V)45A · 30m (690V)45A · 35m (690V)45A · 40m (690V)45A · 45m (690V)45A · 50m (690V)45A · 60m (690V)45A · 70m (690V)10A · 300m (690V)16A · 300m (690V)20A · 300m (690V)25A · 300m (690V)32A · 300m (690V)40A · 300m (690V)50A · 300m (690V)63A · 300m (690V)80A · 300m (690V)100A · 300m (690V)125A · 300m (690V)160A · 300m (690V)200A · 300m (690V)