400 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 400 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 15.44V (2.24%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 15.29V (2.22%)
Voltage at Load674.6 VLine Loss: 10700.0 W
Max Power & Breaker478.05 kW400A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 400A 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 | 2471.06 V (358.12%) | 0.0 V | 4076.09 V (590.74%) | 1712000.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1482.64 V (214.87%) | 0.0 V | 2445.66 V (354.44%) | 1027200.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 926.65 V (134.3%) | 0.0 V | 1528.53 V (221.53%) | 642000.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 617.76 V (89.53%) | 72.2 V | 1019.02 V (147.68%) | 428000.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 370.66 V (53.72%) | 319.3 V | 611.41 V (88.61%) | 256800.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 231.66 V (33.57%) | 458.3 V | 382.13 V (55.38%) | 160500.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 148.26 V (21.49%) | 541.7 V | 244.57 V (35.44%) | 102720.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 105.9 V (15.35%) | 584.1 V | 174.69 V (25.32%) | 73371.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 74.13 V (10.74%) | 615.9 V | 122.28 V (17.72%) | 51360.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 52.95 V (7.67%) | 637.0 V | 87.34 V (12.66%) | 36685.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 39.02 V (5.65%) | 651.0 V | 64.36 V (9.33%) | 27031.6 W | Drop High |
| 120 mm² | 269 A | 210 A | 30.89 V (4.48%) | 659.1 V | 50.95 V (7.38%) | 21400.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 24.71 V (3.58%) | 665.3 V | 40.76 V (5.91%) | 17120.0 W | Drop High |
| 185 mm² | 353 A | 275 A | 20.04 V (2.9%) | 670.0 V | 33.05 V (4.79%) | 13881.1 W | Drop High |
| 240 mm² | 415 A | 324 A | 15.44 V (2.24%) | 674.6 V | 25.48 V (3.69%) | 10700.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 12.36 V (1.79%) | 677.6 V | 20.38 V (2.95%) | 8560.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 9.27 V (1.34%) | 680.7 V | 15.29 V (2.22%) | 6420.0 W | ✓ OK (≤3%) |
FAQ — 400 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 400A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 400A over 250m at 690V (voltage drop: 15.44V or 2.24%).
What is the power capacity of 400A at 690V?
At unity power factor, 400A at 690V supports 478.05 kW with a standard 400A circuit breaker.
Related Lengths & Currents (690V)
400A · 5m (690V)400A · 10m (690V)400A · 15m (690V)400A · 20m (690V)400A · 25m (690V)400A · 30m (690V)400A · 35m (690V)400A · 40m (690V)400A · 45m (690V)400A · 50m (690V)400A · 60m (690V)400A · 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)