125 Amp Cable Size at 45 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 45 m (147.6 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 5.96V (0.86%)
Aluminum Cable (≤3% Drop)70 mm²Drop: 4.91V (0.71%)
Voltage at Load684.0 VLine Loss: 1289.7 W
Max Power & Breaker149.39 kW125A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 125A at 45m
| 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 | 139.0 V (20.14%) | 551.0 V | 229.28 V (33.23%) | 30093.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 83.4 V (12.09%) | 606.6 V | 137.57 V (19.94%) | 18056.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 52.12 V (7.55%) | 637.9 V | 85.98 V (12.46%) | 11285.2 W | Drop High |
| 6 mm² | 41 A | 32 A | 34.75 V (5.04%) | 655.3 V | 57.32 V (8.31%) | 7523.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 20.85 V (3.02%) | 669.2 V | 34.39 V (4.98%) | 4514.1 W | Drop High |
| 16 mm² | 76 A | 59 A | 13.03 V (1.89%) | 677.0 V | 21.5 V (3.12%) | 2821.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 8.34 V (1.21%) | 681.7 V | 13.76 V (1.99%) | 1805.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 5.96 V (0.86%) | 684.0 V | 9.83 V (1.42%) | 1289.7 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 4.17 V (0.6%) | 685.8 V | 6.88 V (1.0%) | 902.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 2.98 V (0.43%) | 687.0 V | 4.91 V (0.71%) | 644.9 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 2.19 V (0.32%) | 687.8 V | 3.62 V (0.52%) | 475.2 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.74 V (0.25%) | 688.3 V | 2.87 V (0.42%) | 376.2 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 1.39 V (0.2%) | 688.6 V | 2.29 V (0.33%) | 300.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 1.13 V (0.16%) | 688.9 V | 1.86 V (0.27%) | 244.0 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.87 V (0.13%) | 689.1 V | 1.43 V (0.21%) | 188.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.69 V (0.1%) | 689.3 V | 1.15 V (0.17%) | 150.5 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.52 V (0.08%) | 689.5 V | 0.86 V (0.12%) | 112.9 W | ✓ OK (≤3%) |
FAQ — 125 Amp Cable Size at 45 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 125A at 45 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 45m at 690V (voltage drop: 5.96V or 0.86%).
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 · 50m (690V)125A · 60m (690V)125A · 70m (690V)10A · 45m (690V)16A · 45m (690V)20A · 45m (690V)25A · 45m (690V)32A · 45m (690V)40A · 45m (690V)50A · 45m (690V)63A · 45m (690V)80A · 45m (690V)100A · 45m (690V)160A · 45m (690V)200A · 45m (690V)