300 Amp Cable Size at 15 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 15 m (49.2 ft).
Copper Cable (≤3% Drop)150 mm²Drop: 1.11V (0.16%)
Aluminum Cable (≤3% Drop)240 mm²Drop: 1.15V (0.17%)
Voltage at Load688.9 VLine Loss: 577.8 W
Max Power & Breaker358.53 kW300A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 300A at 15m
| 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 | 111.2 V (16.12%) | 578.8 V | 183.42 V (26.58%) | 57780.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 66.72 V (9.67%) | 623.3 V | 110.05 V (15.95%) | 34668.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 41.7 V (6.04%) | 648.3 V | 68.78 V (9.97%) | 21667.5 W | Drop High |
| 6 mm² | 41 A | 32 A | 27.8 V (4.03%) | 662.2 V | 45.86 V (6.65%) | 14445.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 16.68 V (2.42%) | 673.3 V | 27.51 V (3.99%) | 8667.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 10.42 V (1.51%) | 679.6 V | 17.2 V (2.49%) | 5416.9 W | Drop High |
| 25 mm² | 101 A | 78 A | 6.67 V (0.97%) | 683.3 V | 11.01 V (1.59%) | 3466.8 W | Drop High |
| 35 mm² | 125 A | 97 A | 4.77 V (0.69%) | 685.2 V | 7.86 V (1.14%) | 2476.3 W | Drop High |
| 50 mm² | 151 A | 118 A | 3.34 V (0.48%) | 686.7 V | 5.5 V (0.8%) | 1733.4 W | Drop High |
| 70 mm² | 192 A | 150 A | 2.38 V (0.35%) | 687.6 V | 3.93 V (0.57%) | 1238.1 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.76 V (0.25%) | 688.2 V | 2.9 V (0.42%) | 912.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.39 V (0.2%) | 688.6 V | 2.29 V (0.33%) | 722.2 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.11 V (0.16%) | 688.9 V | 1.83 V (0.27%) | 577.8 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.9 V (0.13%) | 689.1 V | 1.49 V (0.22%) | 468.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.69 V (0.1%) | 689.3 V | 1.15 V (0.17%) | 361.1 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.56 V (0.08%) | 689.4 V | 0.92 V (0.13%) | 288.9 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.42 V (0.06%) | 689.6 V | 0.69 V (0.1%) | 216.7 W | ✓ OK (≤3%) |
FAQ — 300 Amp Cable Size at 15 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 300A at 15 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 15m at 690V (voltage drop: 1.11V or 0.16%).
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 · 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 · 15m (690V)16A · 15m (690V)20A · 15m (690V)25A · 15m (690V)32A · 15m (690V)40A · 15m (690V)50A · 15m (690V)63A · 15m (690V)80A · 15m (690V)100A · 15m (690V)125A · 15m (690V)160A · 15m (690V)200A · 15m (690V)