125 Amp Cable Size at 80 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 80 m (262.5 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 10.59V (1.53%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 8.73V (1.27%)
Voltage at Load679.4 VLine Loss: 2292.9 W
Max Power & Breaker149.39 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 80m
| 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 | 247.11 V (35.81%) | 442.9 V | 407.61 V (59.07%) | 53500.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 148.26 V (21.49%) | 541.7 V | 244.57 V (35.44%) | 32100.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 92.66 V (13.43%) | 597.3 V | 152.85 V (22.15%) | 20062.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 61.78 V (8.95%) | 628.2 V | 101.9 V (14.77%) | 13375.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 37.07 V (5.37%) | 652.9 V | 61.14 V (8.86%) | 8025.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 23.17 V (3.36%) | 666.8 V | 38.21 V (5.54%) | 5015.6 W | Drop High |
| 25 mm² | 101 A | 78 A | 14.83 V (2.15%) | 675.2 V | 24.46 V (3.54%) | 3210.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 10.59 V (1.53%) | 679.4 V | 17.47 V (2.53%) | 2292.9 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 7.41 V (1.07%) | 682.6 V | 12.23 V (1.77%) | 1605.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 5.3 V (0.77%) | 684.7 V | 8.73 V (1.27%) | 1146.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 3.9 V (0.57%) | 686.1 V | 6.44 V (0.93%) | 844.7 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 3.09 V (0.45%) | 686.9 V | 5.1 V (0.74%) | 668.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 2.47 V (0.36%) | 687.5 V | 4.08 V (0.59%) | 535.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 2.0 V (0.29%) | 688.0 V | 3.3 V (0.48%) | 433.8 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 1.54 V (0.22%) | 688.5 V | 2.55 V (0.37%) | 334.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.24 V (0.18%) | 688.8 V | 2.04 V (0.3%) | 267.5 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.93 V (0.13%) | 689.1 V | 1.53 V (0.22%) | 200.6 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 80 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 125A at 80 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 125A over 80m at 690V (voltage drop: 10.59V or 1.53%).
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 · 80m (690V)16A · 80m (690V)20A · 80m (690V)25A · 80m (690V)32A · 80m (690V)40A · 80m (690V)50A · 80m (690V)63A · 80m (690V)80A · 80m (690V)100A · 80m (690V)160A · 80m (690V)200A · 80m (690V)