20 Amp Cable Size at 400 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 20 A over 400 m (1312.3 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 18.53V (2.69%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 19.57V (2.84%)
Voltage at Load671.5 VLine Loss: 642.0 W
Max Power & Breaker23.9 kW20A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 20A at 400m
| 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 | 197.68 V (28.65%) | 492.3 V | 326.09 V (47.26%) | 6848.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 118.61 V (17.19%) | 571.4 V | 195.65 V (28.36%) | 4108.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 74.13 V (10.74%) | 615.9 V | 122.28 V (17.72%) | 2568.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 49.42 V (7.16%) | 640.6 V | 81.52 V (11.81%) | 1712.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 29.65 V (4.3%) | 660.3 V | 48.91 V (7.09%) | 1027.2 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 642.0 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 11.86 V (1.72%) | 678.1 V | 19.57 V (2.84%) | 410.9 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 8.47 V (1.23%) | 681.5 V | 13.98 V (2.03%) | 293.5 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 5.93 V (0.86%) | 684.1 V | 9.78 V (1.42%) | 205.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 4.24 V (0.61%) | 685.8 V | 6.99 V (1.01%) | 146.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 3.12 V (0.45%) | 686.9 V | 5.15 V (0.75%) | 108.1 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 2.47 V (0.36%) | 687.5 V | 4.08 V (0.59%) | 85.6 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.98 V (0.29%) | 688.0 V | 3.26 V (0.47%) | 68.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.6 V (0.23%) | 688.4 V | 2.64 V (0.38%) | 55.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.24 V (0.18%) | 688.8 V | 2.04 V (0.3%) | 42.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.99 V (0.14%) | 689.0 V | 1.63 V (0.24%) | 34.2 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.74 V (0.11%) | 689.3 V | 1.22 V (0.18%) | 25.7 W | ✓ OK (≤3%) |
FAQ — 20 Amp Cable Size at 400 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 20A at 400 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 20A over 400m at 690V (voltage drop: 18.53V or 2.69%).
What is the power capacity of 20A at 690V?
At unity power factor, 20A at 690V supports 23.9 kW with a standard 20A circuit breaker.
Related Lengths & Currents (690V)
20A · 5m (690V)20A · 10m (690V)20A · 15m (690V)20A · 20m (690V)20A · 25m (690V)20A · 30m (690V)20A · 35m (690V)20A · 40m (690V)20A · 45m (690V)20A · 50m (690V)20A · 60m (690V)20A · 70m (690V)10A · 400m (690V)16A · 400m (690V)25A · 400m (690V)32A · 400m (690V)40A · 400m (690V)50A · 400m (690V)63A · 400m (690V)80A · 400m (690V)100A · 400m (690V)125A · 400m (690V)160A · 400m (690V)200A · 400m (690V)