800 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 800 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 9.27V (1.34%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 30.57V (4.43%)
Voltage at Load680.7 VLine Loss: 12840.0 W
Max Power & Breaker956.09 kW800A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 800A at 250m
| 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 | 4942.12 V (716.25%) | 0.0 V | 8152.19 V (1181.48%) | 6848000.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 2965.27 V (429.75%) | 0.0 V | 4891.31 V (708.89%) | 4108800.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 1853.29 V (268.59%) | 0.0 V | 3057.07 V (443.05%) | 2568000.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 1235.53 V (179.06%) | 0.0 V | 2038.05 V (295.37%) | 1712000.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 741.32 V (107.44%) | 0.0 V | 1222.83 V (177.22%) | 1027200.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 463.32 V (67.15%) | 226.7 V | 764.27 V (110.76%) | 642000.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 296.53 V (42.97%) | 393.5 V | 489.13 V (70.89%) | 410880.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 211.81 V (30.7%) | 478.2 V | 349.38 V (50.63%) | 293485.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 148.26 V (21.49%) | 541.7 V | 244.57 V (35.44%) | 205440.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 105.9 V (15.35%) | 584.1 V | 174.69 V (25.32%) | 146742.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 78.03 V (11.31%) | 612.0 V | 128.72 V (18.65%) | 108126.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 61.78 V (8.95%) | 628.2 V | 101.9 V (14.77%) | 85600.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 49.42 V (7.16%) | 640.6 V | 81.52 V (11.81%) | 68480.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 40.07 V (5.81%) | 649.9 V | 66.1 V (9.58%) | 55524.3 W | Drop High |
| 240 mm² | 415 A | 324 A | 30.89 V (4.48%) | 659.1 V | 50.95 V (7.38%) | 42800.0 W | Drop High |
| 300 mm² | 477 A | 372 A | 24.71 V (3.58%) | 665.3 V | 40.76 V (5.91%) | 34240.0 W | Drop High |
| 400 mm² | 570 A | 445 A | 18.53 V (2.69%) | 671.5 V | 30.57 V (4.43%) | 25680.0 W | Drop High |
FAQ — 800 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 800A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 800A over 250m at 690V (voltage drop: 9.27V or 1.34%).
What is the power capacity of 800A at 690V?
At unity power factor, 800A at 690V supports 956.09 kW with a standard 800A circuit breaker.
Related Lengths & Currents (690V)
800A · 5m (690V)800A · 10m (690V)800A · 15m (690V)800A · 20m (690V)800A · 25m (690V)800A · 30m (690V)800A · 35m (690V)800A · 40m (690V)800A · 45m (690V)800A · 50m (690V)800A · 60m (690V)800A · 70m (690V)10A · 250m (690V)16A · 250m (690V)20A · 250m (690V)25A · 250m (690V)32A · 250m (690V)40A · 250m (690V)50A · 250m (690V)63A · 250m (690V)80A · 250m (690V)100A · 250m (690V)125A · 250m (690V)160A · 250m (690V)200A · 250m (690V)