100 Amp Cable Size at 70 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 100 A over 70 m (229.7 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 10.38V (2.5%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 8.56V (2.06%)
Voltage at Load404.6 VLine Loss: 1797.6 W
Max Power & Breaker71.88 kW100A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 100A at 70m
| 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 | 172.97 V (41.68%) | 242.0 V | 285.33 V (68.75%) | 29960.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 103.78 V (25.01%) | 311.2 V | 171.2 V (41.25%) | 17976.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 64.87 V (15.63%) | 350.1 V | 107.0 V (25.78%) | 11235.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 43.24 V (10.42%) | 371.8 V | 71.33 V (17.19%) | 7490.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 25.95 V (6.25%) | 389.1 V | 42.8 V (10.31%) | 4494.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 16.22 V (3.91%) | 398.8 V | 26.75 V (6.45%) | 2808.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 10.38 V (2.5%) | 404.6 V | 17.12 V (4.13%) | 1797.6 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 7.41 V (1.79%) | 407.6 V | 12.23 V (2.95%) | 1284.0 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 5.19 V (1.25%) | 409.8 V | 8.56 V (2.06%) | 898.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 3.71 V (0.89%) | 411.3 V | 6.11 V (1.47%) | 642.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.73 V (0.66%) | 412.3 V | 4.51 V (1.09%) | 473.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 2.16 V (0.52%) | 412.8 V | 3.57 V (0.86%) | 374.5 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.73 V (0.42%) | 413.3 V | 2.85 V (0.69%) | 299.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.4 V (0.34%) | 413.6 V | 2.31 V (0.56%) | 242.9 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.08 V (0.26%) | 413.9 V | 1.78 V (0.43%) | 187.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.86 V (0.21%) | 414.1 V | 1.43 V (0.34%) | 149.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.65 V (0.16%) | 414.4 V | 1.07 V (0.26%) | 112.4 W | ✓ OK (≤3%) |
FAQ — 100 Amp Cable Size at 70 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 100A at 70 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 100A over 70m at 415V (voltage drop: 10.38V or 2.5%).
What is the power capacity of 100A at 415V?
At unity power factor, 100A at 415V supports 71.88 kW with a standard 100A circuit breaker.
Related Lengths & Currents (415V)
100A · 5m (415V)100A · 10m (415V)100A · 15m (415V)100A · 20m (415V)100A · 25m (415V)100A · 30m (415V)100A · 35m (415V)100A · 40m (415V)100A · 45m (415V)100A · 50m (415V)100A · 60m (415V)10A · 70m (415V)16A · 70m (415V)20A · 70m (415V)25A · 70m (415V)32A · 70m (415V)40A · 70m (415V)50A · 70m (415V)63A · 70m (415V)80A · 70m (415V)125A · 70m (415V)160A · 70m (415V)200A · 70m (415V)