300 Amp Cable Size at 300 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 300 m (984.3 ft).
Copper Cable (≤3% Drop)185 mm²Drop: 18.03V (2.61%)
Aluminum Cable (≤3% Drop)300 mm²Drop: 18.34V (2.66%)
Voltage at Load672.0 VLine Loss: 9369.7 W
Max Power & Breaker358.53 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A at 300m
| 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 | 2223.95 V (322.31%) | 0.0 V | 3668.48 V (531.66%) | 1155600.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 1334.37 V (193.39%) | 0.0 V | 2201.09 V (319.0%) | 693360.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 833.98 V (120.87%) | 0.0 V | 1375.68 V (199.37%) | 433350.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 555.99 V (80.58%) | 134.0 V | 917.12 V (132.92%) | 288900.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 333.59 V (48.35%) | 356.4 V | 550.27 V (79.75%) | 173340.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 208.5 V (30.22%) | 481.5 V | 343.92 V (49.84%) | 108337.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 133.44 V (19.34%) | 556.6 V | 220.11 V (31.9%) | 69336.0 W | Drop High |
| 35 mm² | 125 A | 97 A | 95.31 V (13.81%) | 594.7 V | 157.22 V (22.79%) | 49525.7 W | Drop High |
| 50 mm² | 151 A | 118 A | 66.72 V (9.67%) | 623.3 V | 110.05 V (15.95%) | 34668.0 W | Drop High |
| 70 mm² | 192 A | 150 A | 47.66 V (6.91%) | 642.3 V | 78.61 V (11.39%) | 24762.9 W | Drop High |
| 95 mm² | 232 A | 181 A | 35.12 V (5.09%) | 654.9 V | 57.92 V (8.39%) | 18246.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 27.8 V (4.03%) | 662.2 V | 45.86 V (6.65%) | 14445.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 22.24 V (3.22%) | 667.8 V | 36.68 V (5.32%) | 11556.0 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 18.03 V (2.61%) | 672.0 V | 29.74 V (4.31%) | 9369.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 13.9 V (2.01%) | 676.1 V | 22.93 V (3.32%) | 7222.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 11.12 V (1.61%) | 678.9 V | 18.34 V (2.66%) | 5778.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 8.34 V (1.21%) | 681.7 V | 13.76 V (1.99%) | 4333.5 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 300 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 300 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 185 mm² copper cable for 300A over 300m at 690V (voltage drop: 18.03V or 2.61%).
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 · 300m (690V)16A · 300m (690V)20A · 300m (690V)25A · 300m (690V)32A · 300m (690V)40A · 300m (690V)50A · 300m (690V)63A · 300m (690V)80A · 300m (690V)100A · 300m (690V)125A · 300m (690V)160A · 300m (690V)200A · 300m (690V)