350 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 350 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 17.53V (2.54%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 17.83V (2.58%)
Voltage at Load672.5 VLine Loss: 10627.7 W
Max Power & Breaker418.29 kW350A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 350A 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 | 2162.18 V (313.36%) | 0.0 V | 3566.58 V (516.9%) | 1310750.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1297.31 V (188.02%) | 0.0 V | 2139.95 V (310.14%) | 786450.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 810.82 V (117.51%) | 0.0 V | 1337.47 V (193.84%) | 491531.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 540.54 V (78.34%) | 149.5 V | 891.65 V (129.22%) | 327687.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 324.33 V (47.0%) | 365.7 V | 534.99 V (77.53%) | 196612.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 202.7 V (29.38%) | 487.3 V | 334.37 V (48.46%) | 122882.8 W | Drop High |
| 25 mm² | 101 A | 78 A | 129.73 V (18.8%) | 560.3 V | 213.99 V (31.01%) | 78645.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 92.66 V (13.43%) | 597.3 V | 152.85 V (22.15%) | 56175.0 W | Drop High |
| 50 mm² | 151 A | 118 A | 64.87 V (9.4%) | 625.1 V | 107.0 V (15.51%) | 39322.5 W | Drop High |
| 70 mm² | 192 A | 150 A | 46.33 V (6.71%) | 643.7 V | 76.43 V (11.08%) | 28087.5 W | Drop High |
| 95 mm² | 232 A | 181 A | 34.14 V (4.95%) | 655.9 V | 56.31 V (8.16%) | 20696.1 W | Drop High |
| 120 mm² | 269 A | 210 A | 27.03 V (3.92%) | 663.0 V | 44.58 V (6.46%) | 16384.4 W | Drop High |
| 150 mm² | 309 A | 241 A | 21.62 V (3.13%) | 668.4 V | 35.67 V (5.17%) | 13107.5 W | Drop High |
| 185 mm² | 353 A | 275 A | 17.53 V (2.54%) | 672.5 V | 28.92 V (4.19%) | 10627.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 13.51 V (1.96%) | 676.5 V | 22.29 V (3.23%) | 8192.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 10.81 V (1.57%) | 679.2 V | 17.83 V (2.58%) | 6553.8 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 8.11 V (1.18%) | 681.9 V | 13.37 V (1.94%) | 4915.3 W | ✓ OK (≤3%) |
FAQ — 350 Amp Cable Size at 250 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 350A at 250 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 185 mm² copper cable for 350A over 250m at 690V (voltage drop: 17.53V or 2.54%).
What is the power capacity of 350A at 690V?
At unity power factor, 350A at 690V supports 418.29 kW with a standard 350A circuit breaker.
Related Lengths & Currents (690V)
350A · 5m (690V)350A · 10m (690V)350A · 15m (690V)350A · 20m (690V)350A · 25m (690V)350A · 30m (690V)350A · 35m (690V)350A · 40m (690V)350A · 45m (690V)350A · 50m (690V)350A · 60m (690V)350A · 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)