275 Amp Cable Size at 120 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 275 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 8.15V (1.18%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 10.91V (1.58%)
Voltage at Load681.8 VLine Loss: 3884.1 W
Max Power & Breaker328.66 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 275A at 120m
| 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 | 815.45 V (118.18%) | 0.0 V | 1345.11 V (194.94%) | 388410.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 489.27 V (70.91%) | 200.7 V | 807.07 V (116.97%) | 233046.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 305.79 V (44.32%) | 384.2 V | 504.42 V (73.1%) | 145653.8 W | Drop High |
| 6 mm² | 41 A | 32 A | 203.86 V (29.55%) | 486.1 V | 336.28 V (48.74%) | 97102.5 W | Drop High |
| 10 mm² | 57 A | 44 A | 122.32 V (17.73%) | 567.7 V | 201.77 V (29.24%) | 58261.5 W | Drop High |
| 16 mm² | 76 A | 59 A | 76.45 V (11.08%) | 613.6 V | 126.1 V (18.28%) | 36413.4 W | Drop High |
| 25 mm² | 101 A | 78 A | 48.93 V (7.09%) | 641.1 V | 80.71 V (11.7%) | 23304.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 34.95 V (5.06%) | 655.1 V | 57.65 V (8.35%) | 16646.1 W | Drop High |
| 50 mm² | 151 A | 118 A | 24.46 V (3.55%) | 665.5 V | 40.35 V (5.85%) | 11652.3 W | Drop High |
| 70 mm² | 192 A | 150 A | 17.47 V (2.53%) | 672.5 V | 28.82 V (4.18%) | 8323.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 12.88 V (1.87%) | 677.1 V | 21.24 V (3.08%) | 6132.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 10.19 V (1.48%) | 679.8 V | 16.81 V (2.44%) | 4855.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 8.15 V (1.18%) | 681.8 V | 13.45 V (1.95%) | 3884.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 6.61 V (0.96%) | 683.4 V | 10.91 V (1.58%) | 3149.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 5.1 V (0.74%) | 684.9 V | 8.41 V (1.22%) | 2427.6 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 4.08 V (0.59%) | 685.9 V | 6.73 V (0.97%) | 1942.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 3.06 V (0.44%) | 686.9 V | 5.04 V (0.73%) | 1456.5 W | ✓ OK (≤3%) |
FAQ — 275 Amp Cable Size at 120 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 275A at 120 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 275A over 120m at 690V (voltage drop: 8.15V or 1.18%).
What is the power capacity of 275A at 690V?
At unity power factor, 275A at 690V supports 328.66 kW with a standard 300A circuit breaker.
Related Lengths & Currents (690V)
275A · 5m (690V)275A · 10m (690V)275A · 15m (690V)275A · 20m (690V)275A · 25m (690V)275A · 30m (690V)275A · 35m (690V)275A · 40m (690V)275A · 45m (690V)275A · 50m (690V)275A · 60m (690V)275A · 70m (690V)10A · 120m (690V)16A · 120m (690V)20A · 120m (690V)25A · 120m (690V)32A · 120m (690V)40A · 120m (690V)50A · 120m (690V)63A · 120m (690V)80A · 120m (690V)100A · 120m (690V)125A · 120m (690V)160A · 120m (690V)200A · 120m (690V)