125 Amp Cable Size at 500 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 125 A over 500 m (1640.4 ft).
Copper Cable (≤3% Drop)120 mm²Drop: 19.31V (2.8%)
Aluminum Cable (≤3% Drop)185 mm²Drop: 20.66V (2.99%)
Voltage at Load670.7 VLine Loss: 4179.7 W
Max Power & Breaker149.39 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 500m
| 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 | 1544.41 V (223.83%) | 0.0 V | 2547.56 V (369.21%) | 334375.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 926.65 V (134.3%) | 0.0 V | 1528.53 V (221.53%) | 200625.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 579.15 V (83.94%) | 110.8 V | 955.33 V (138.45%) | 125390.6 W | Drop High |
| 6 mm² | 41 A | 32 A | 386.1 V (55.96%) | 303.9 V | 636.89 V (92.3%) | 83593.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 231.66 V (33.57%) | 458.3 V | 382.13 V (55.38%) | 50156.2 W | Drop High |
| 16 mm² | 76 A | 59 A | 144.79 V (20.98%) | 545.2 V | 238.83 V (34.61%) | 31347.7 W | Drop High |
| 25 mm² | 101 A | 78 A | 92.66 V (13.43%) | 597.3 V | 152.85 V (22.15%) | 20062.5 W | Drop High |
| 35 mm² | 125 A | 97 A | 66.19 V (9.59%) | 623.8 V | 109.18 V (15.82%) | 14330.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 46.33 V (6.71%) | 643.7 V | 76.43 V (11.08%) | 10031.2 W | Drop High |
| 70 mm² | 192 A | 150 A | 33.09 V (4.8%) | 656.9 V | 54.59 V (7.91%) | 7165.2 W | ~ ≤5% |
| 95 mm² | 232 A | 181 A | 24.39 V (3.53%) | 665.6 V | 40.22 V (5.83%) | 5279.6 W | ~ ≤5% |
| 120 mm² | 269 A | 210 A | 19.31 V (2.8%) | 670.7 V | 31.84 V (4.62%) | 4179.7 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 15.44 V (2.24%) | 674.6 V | 25.48 V (3.69%) | 3343.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 12.52 V (1.81%) | 677.5 V | 20.66 V (2.99%) | 2711.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 9.65 V (1.4%) | 680.3 V | 15.92 V (2.31%) | 2089.8 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 7.72 V (1.12%) | 682.3 V | 12.74 V (1.85%) | 1671.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 5.79 V (0.84%) | 684.2 V | 9.55 V (1.38%) | 1253.9 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 500 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 125A at 500 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 120 mm² copper cable for 125A over 500m at 690V (voltage drop: 19.31V or 2.8%).
What is the power capacity of 125A at 690V?
At unity power factor, 125A at 690V supports 149.39 kW with a standard 125A circuit breaker.
Related Lengths & Currents (690V)
125A · 5m (690V)125A · 10m (690V)125A · 15m (690V)125A · 20m (690V)125A · 25m (690V)125A · 30m (690V)125A · 35m (690V)125A · 40m (690V)125A · 45m (690V)125A · 50m (690V)125A · 60m (690V)125A · 70m (690V)10A · 500m (690V)16A · 500m (690V)20A · 500m (690V)25A · 500m (690V)32A · 500m (690V)40A · 500m (690V)50A · 500m (690V)63A · 500m (690V)80A · 500m (690V)100A · 500m (690V)160A · 500m (690V)200A · 500m (690V)