300 Amp Cable Size at 90 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 300 A over 90 m (295.3 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 6.67V (0.97%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 6.88V (1.0%)
Voltage at Load683.3 VLine Loss: 3466.8 W
Max Power & Breaker358.53 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A at 90m
| 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 | 667.19 V (96.69%) | 22.8 V | 1100.55 V (159.5%) | 346680.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 400.31 V (58.02%) | 289.7 V | 660.33 V (95.7%) | 208008.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 250.19 V (36.26%) | 439.8 V | 412.7 V (59.81%) | 130005.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 166.8 V (24.17%) | 523.2 V | 275.14 V (39.87%) | 86670.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 100.08 V (14.5%) | 589.9 V | 165.08 V (23.92%) | 52002.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 62.55 V (9.07%) | 627.5 V | 103.18 V (14.95%) | 32501.2 W | Drop High |
| 25 mm² | 101 A | 78 A | 40.03 V (5.8%) | 650.0 V | 66.03 V (9.57%) | 20800.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 28.59 V (4.14%) | 661.4 V | 47.17 V (6.84%) | 14857.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 20.02 V (2.9%) | 670.0 V | 33.02 V (4.78%) | 10400.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 14.3 V (2.07%) | 675.7 V | 23.58 V (3.42%) | 7428.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 10.53 V (1.53%) | 679.5 V | 17.38 V (2.52%) | 5473.9 W | Drop High |
| 120 mm² | 269 A | 210 A | 8.34 V (1.21%) | 681.7 V | 13.76 V (1.99%) | 4333.5 W | Drop High |
| 150 mm² | 309 A | 241 A | 6.67 V (0.97%) | 683.3 V | 11.01 V (1.59%) | 3466.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 5.41 V (0.78%) | 684.6 V | 8.92 V (1.29%) | 2810.9 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 4.17 V (0.6%) | 685.8 V | 6.88 V (1.0%) | 2166.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 3.34 V (0.48%) | 686.7 V | 5.5 V (0.8%) | 1733.4 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 2.5 V (0.36%) | 687.5 V | 4.13 V (0.6%) | 1300.0 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 90 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 90 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 150 mm² copper cable for 300A over 90m at 690V (voltage drop: 6.67V or 0.97%).
What is the power capacity of 300A at 690V?
At unity power factor, 300A at 690V supports 358.53 kW with a standard 300A circuit breaker.
Related Lengths & Currents (690V)
300A · 5m (690V)300A · 10m (690V)300A · 15m (690V)300A · 20m (690V)300A · 25m (690V)300A · 30m (690V)300A · 35m (690V)300A · 40m (690V)300A · 45m (690V)300A · 50m (690V)300A · 60m (690V)300A · 70m (690V)10A · 90m (690V)16A · 90m (690V)20A · 90m (690V)25A · 90m (690V)32A · 90m (690V)40A · 90m (690V)50A · 90m (690V)63A · 90m (690V)80A · 90m (690V)100A · 90m (690V)125A · 90m (690V)160A · 90m (690V)200A · 90m (690V)