100 Amp Cable Size at 20 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 20 m (65.6 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 2.97V (0.71%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 2.45V (0.59%)
Voltage at Load412.0 VLine Loss: 513.6 W
Max Power & Breaker71.88 kW100A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 100A at 20m
| 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 | 49.42 V (11.91%) | 365.6 V | 81.52 V (19.64%) | 8560.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 29.65 V (7.15%) | 385.3 V | 48.91 V (11.79%) | 5136.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 18.53 V (4.47%) | 396.5 V | 30.57 V (7.37%) | 3210.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 12.36 V (2.98%) | 402.6 V | 20.38 V (4.91%) | 2140.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 7.41 V (1.79%) | 407.6 V | 12.23 V (2.95%) | 1284.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 4.63 V (1.12%) | 410.4 V | 7.64 V (1.84%) | 802.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 2.97 V (0.71%) | 412.0 V | 4.89 V (1.18%) | 513.6 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 2.12 V (0.51%) | 412.9 V | 3.49 V (0.84%) | 366.9 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.48 V (0.36%) | 413.5 V | 2.45 V (0.59%) | 256.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.06 V (0.26%) | 413.9 V | 1.75 V (0.42%) | 183.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.78 V (0.19%) | 414.2 V | 1.29 V (0.31%) | 135.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.62 V (0.15%) | 414.4 V | 1.02 V (0.25%) | 107.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.49 V (0.12%) | 414.5 V | 0.82 V (0.2%) | 85.6 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.4 V (0.1%) | 414.6 V | 0.66 V (0.16%) | 69.4 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.31 V (0.07%) | 414.7 V | 0.51 V (0.12%) | 53.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.25 V (0.06%) | 414.8 V | 0.41 V (0.1%) | 42.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.19 V (0.04%) | 414.8 V | 0.31 V (0.07%) | 32.1 W | ✓ OK (≤3%) |
FAQ — 100 Amp Cable Size at 20 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 100A at 20 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 20m at 415V (voltage drop: 2.97V or 0.71%).
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 · 25m (415V)100A · 30m (415V)100A · 35m (415V)100A · 40m (415V)100A · 45m (415V)100A · 50m (415V)100A · 60m (415V)100A · 70m (415V)10A · 20m (415V)16A · 20m (415V)20A · 20m (415V)25A · 20m (415V)32A · 20m (415V)40A · 20m (415V)50A · 20m (415V)63A · 20m (415V)80A · 20m (415V)125A · 20m (415V)160A · 20m (415V)200A · 20m (415V)