475 Amp Cable Size at 20 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 475 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)300 mm²Drop: 1.17V (0.17%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 1.45V (0.21%)
Voltage at Load688.8 VLine Loss: 965.7 W
Max Power & Breaker567.68 kW500A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 475A 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 | 234.75 V (34.02%) | 455.2 V | 387.23 V (56.12%) | 193135.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 140.85 V (20.41%) | 549.1 V | 232.34 V (33.67%) | 115881.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 88.03 V (12.76%) | 602.0 V | 145.21 V (21.05%) | 72425.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 58.69 V (8.51%) | 631.3 V | 96.81 V (14.03%) | 48283.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 35.21 V (5.1%) | 654.8 V | 58.08 V (8.42%) | 28970.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 22.01 V (3.19%) | 668.0 V | 36.3 V (5.26%) | 18106.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 14.09 V (2.04%) | 675.9 V | 23.23 V (3.37%) | 11588.1 W | Drop High |
| 35 mm² | 125 A | 97 A | 10.06 V (1.46%) | 679.9 V | 16.6 V (2.41%) | 8277.2 W | Drop High |
| 50 mm² | 151 A | 118 A | 7.04 V (1.02%) | 683.0 V | 11.62 V (1.68%) | 5794.1 W | Drop High |
| 70 mm² | 192 A | 150 A | 5.03 V (0.73%) | 685.0 V | 8.3 V (1.2%) | 4138.6 W | Drop High |
| 95 mm² | 232 A | 181 A | 3.71 V (0.54%) | 686.3 V | 6.11 V (0.89%) | 3049.5 W | Drop High |
| 120 mm² | 269 A | 210 A | 2.93 V (0.43%) | 687.1 V | 4.84 V (0.7%) | 2414.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 2.35 V (0.34%) | 687.7 V | 3.87 V (0.56%) | 1931.3 W | Drop High |
| 185 mm² | 353 A | 275 A | 1.9 V (0.28%) | 688.1 V | 3.14 V (0.46%) | 1566.0 W | Drop High |
| 240 mm² | 415 A | 324 A | 1.47 V (0.21%) | 688.5 V | 2.42 V (0.35%) | 1207.1 W | Drop High |
| 300 mm² | 477 A | 372 A | 1.17 V (0.17%) | 688.8 V | 1.94 V (0.28%) | 965.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.88 V (0.13%) | 689.1 V | 1.45 V (0.21%) | 724.3 W | ✓ OK (≤3%) |
FAQ — 475 Amp Cable Size at 20 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 475A at 20 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 300 mm² copper cable for 475A over 20m at 690V (voltage drop: 1.17V or 0.17%).
What is the power capacity of 475A at 690V?
At unity power factor, 475A at 690V supports 567.68 kW with a standard 500A circuit breaker.
Related Lengths & Currents (690V)
475A · 5m (690V)475A · 10m (690V)475A · 15m (690V)475A · 25m (690V)475A · 30m (690V)475A · 35m (690V)475A · 40m (690V)475A · 45m (690V)475A · 50m (690V)475A · 60m (690V)475A · 70m (690V)10A · 20m (690V)16A · 20m (690V)20A · 20m (690V)25A · 20m (690V)32A · 20m (690V)40A · 20m (690V)50A · 20m (690V)63A · 20m (690V)80A · 20m (690V)100A · 20m (690V)125A · 20m (690V)160A · 20m (690V)200A · 20m (690V)