300 Amp Cable Size at 40 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 40 m (131.2 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 2.97V (0.43%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 3.06V (0.44%)
Voltage at Load687.0 VLine Loss: 1540.8 W
Max Power & Breaker358.53 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A at 40m
| 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 | 296.53 V (42.97%) | 393.5 V | 489.13 V (70.89%) | 154080.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 177.92 V (25.78%) | 512.1 V | 293.48 V (42.53%) | 92448.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 111.2 V (16.12%) | 578.8 V | 183.42 V (26.58%) | 57780.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 74.13 V (10.74%) | 615.9 V | 122.28 V (17.72%) | 38520.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 44.48 V (6.45%) | 645.5 V | 73.37 V (10.63%) | 23112.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 27.8 V (4.03%) | 662.2 V | 45.86 V (6.65%) | 14445.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 17.79 V (2.58%) | 672.2 V | 29.35 V (4.25%) | 9244.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 12.71 V (1.84%) | 677.3 V | 20.96 V (3.04%) | 6603.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 8.9 V (1.29%) | 681.1 V | 14.67 V (2.13%) | 4622.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 6.35 V (0.92%) | 683.6 V | 10.48 V (1.52%) | 3301.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 4.68 V (0.68%) | 685.3 V | 7.72 V (1.12%) | 2432.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 3.71 V (0.54%) | 686.3 V | 6.11 V (0.89%) | 1926.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.97 V (0.43%) | 687.0 V | 4.89 V (0.71%) | 1540.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.4 V (0.35%) | 687.6 V | 3.97 V (0.57%) | 1249.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.85 V (0.27%) | 688.1 V | 3.06 V (0.44%) | 963.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.48 V (0.21%) | 688.5 V | 2.45 V (0.35%) | 770.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.11 V (0.16%) | 688.9 V | 1.83 V (0.27%) | 577.8 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 40 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 40 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 40m at 690V (voltage drop: 2.97V or 0.43%).
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 · 25m (690V)300A · 30m (690V)300A · 35m (690V)300A · 45m (690V)300A · 50m (690V)300A · 60m (690V)300A · 70m (690V)10A · 40m (690V)16A · 40m (690V)20A · 40m (690V)25A · 40m (690V)32A · 40m (690V)40A · 40m (690V)50A · 40m (690V)63A · 40m (690V)80A · 40m (690V)100A · 40m (690V)125A · 40m (690V)160A · 40m (690V)200A · 40m (690V)