40 Amp Cable Size at 300 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 40 A over 300 m (984.3 ft).
Copper Cable (≤3% Drop)50 mm²Drop: 8.9V (2.14%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 10.48V (2.53%)
Voltage at Load406.1 VLine Loss: 616.3 W
Max Power & Breaker28.75 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A 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 | 296.53 V (71.45%) | 118.5 V | 489.13 V (117.86%) | 20544.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 177.92 V (42.87%) | 237.1 V | 293.48 V (70.72%) | 12326.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 111.2 V (26.79%) | 303.8 V | 183.42 V (44.2%) | 7704.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 74.13 V (17.86%) | 340.9 V | 122.28 V (29.47%) | 5136.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 44.48 V (10.72%) | 370.5 V | 73.37 V (17.68%) | 3081.6 W | Drop High |
| 16 mm² | 76 A | 59 A | 27.8 V (6.7%) | 387.2 V | 45.86 V (11.05%) | 1926.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 17.79 V (4.29%) | 397.2 V | 29.35 V (7.07%) | 1232.6 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 12.71 V (3.06%) | 402.3 V | 20.96 V (5.05%) | 880.5 W | ~ ≤5% |
| 50 mm² | 151 A | 118 A | 8.9 V (2.14%) | 406.1 V | 14.67 V (3.54%) | 616.3 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 6.35 V (1.53%) | 408.6 V | 10.48 V (2.53%) | 440.2 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 4.68 V (1.13%) | 410.3 V | 7.72 V (1.86%) | 324.4 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.71 V (0.89%) | 411.3 V | 6.11 V (1.47%) | 256.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.97 V (0.71%) | 412.0 V | 4.89 V (1.18%) | 205.4 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.4 V (0.58%) | 412.6 V | 3.97 V (0.96%) | 166.6 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.85 V (0.45%) | 413.1 V | 3.06 V (0.74%) | 128.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.48 V (0.36%) | 413.5 V | 2.45 V (0.59%) | 102.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.11 V (0.27%) | 413.9 V | 1.83 V (0.44%) | 77.0 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 300 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 40A at 300 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 50 mm² copper cable for 40A over 300m at 415V (voltage drop: 8.9V or 2.14%).
What is the power capacity of 40A at 415V?
At unity power factor, 40A at 415V supports 28.75 kW with a standard 40A circuit breaker.
Related Lengths & Currents (415V)
40A · 5m (415V)40A · 10m (415V)40A · 15m (415V)40A · 20m (415V)40A · 25m (415V)40A · 30m (415V)40A · 35m (415V)40A · 40m (415V)40A · 45m (415V)40A · 50m (415V)40A · 60m (415V)40A · 70m (415V)10A · 300m (415V)16A · 300m (415V)20A · 300m (415V)25A · 300m (415V)32A · 300m (415V)50A · 300m (415V)63A · 300m (415V)80A · 300m (415V)100A · 300m (415V)125A · 300m (415V)160A · 300m (415V)200A · 300m (415V)