800 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 800 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.74V (0.18%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.45V (0.59%)
Voltage at Load414.3 VLine Loss: 1027.2 W
Max Power & Breaker575.04 kW800A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 800A 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 | 395.37 V (95.27%) | 19.6 V | 652.17 V (157.15%) | 547840.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 237.22 V (57.16%) | 177.8 V | 391.3 V (94.29%) | 328704.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 148.26 V (35.73%) | 266.7 V | 244.57 V (58.93%) | 205440.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 98.84 V (23.82%) | 316.2 V | 163.04 V (39.29%) | 136960.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 59.31 V (14.29%) | 355.7 V | 97.83 V (23.57%) | 82176.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 37.07 V (8.93%) | 377.9 V | 61.14 V (14.73%) | 51360.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 23.72 V (5.72%) | 391.3 V | 39.13 V (9.43%) | 32870.4 W | Drop High |
| 35 mm² | 125 A | 97 A | 16.94 V (4.08%) | 398.1 V | 27.95 V (6.74%) | 23478.9 W | Drop High |
| 50 mm² | 151 A | 118 A | 11.86 V (2.86%) | 403.1 V | 19.57 V (4.71%) | 16435.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 8.47 V (2.04%) | 406.5 V | 13.98 V (3.37%) | 11739.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 6.24 V (1.5%) | 408.8 V | 10.3 V (2.48%) | 8650.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 4.94 V (1.19%) | 410.1 V | 8.15 V (1.96%) | 6848.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 3.95 V (0.95%) | 411.0 V | 6.52 V (1.57%) | 5478.4 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.21 V (0.77%) | 411.8 V | 5.29 V (1.27%) | 4441.9 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.47 V (0.6%) | 412.5 V | 4.08 V (0.98%) | 3424.0 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.98 V (0.48%) | 413.0 V | 3.26 V (0.79%) | 2739.2 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.48 V (0.36%) | 413.5 V | 2.45 V (0.59%) | 2054.4 W | Drop High |
FAQ — 800 Amp Cable Size at 20 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 800A at 20 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 800A over 20m at 415V (voltage drop: 0.74V or 0.18%).
What is the power capacity of 800A at 415V?
At unity power factor, 800A at 415V supports 575.04 kW with a standard 800A circuit breaker.
Related Lengths & Currents (415V)
800A · 5m (415V)800A · 10m (415V)800A · 15m (415V)800A · 25m (415V)800A · 30m (415V)800A · 35m (415V)800A · 40m (415V)800A · 45m (415V)800A · 50m (415V)800A · 60m (415V)800A · 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)100A · 20m (415V)125A · 20m (415V)160A · 20m (415V)200A · 20m (415V)