Note that these charts are general and may vary depending on the specific application, installation conditions, and manufacturer. It's always best to consult with a qualified electrical engineer or the manufacturer's documentation for specific cable sizing requirements.
| Voltage (kV) | Conductor Cross-Sectional Area (mm²) | Cable Diameter (mm) | Weight (kg/km) | | --- | --- | --- | --- | | 6 | 35 | 15.5 | 450 | | 6 | 50 | 17.5 | 550 | | 6 | 70 | 19.5 | 700 | | 10 | 35 | 18.5 | 600 | | 10 | 50 | 20.5 | 750 | | 10 | 70 | 22.5 | 900 | | 15 | 50 | 22.5 | 900 | | 15 | 70 | 24.5 | 1100 | | 15 | 95 | 27.5 | 1400 | | 20 | 70 | 27.5 | 1400 | | 20 | 95 | 30.5 | 1700 | | 20 | 120 | 33.5 | 2100 |
A good medium voltage cable size chart is not optional – it's the law (NEC Table 310.60 for MV). But a bad chart (just a list of sizes and ampacities) is worse than useless; it's a trap.
Ensure the cable survives a fault.
Used when faults may take up to an hour to clear. This requires thicker insulation, which affects the overall cable diameter and conduit sizing. 4. Environment and Derating
Choosing the right cable is a critical decision for any industrial or utility project. Because medium voltage systems (typically ranging from 2kV to 35kV ) carry significantly more energy than standard low-voltage lines, an undersized cable isn't just a performance issue—it’s a fire hazard and a potential system failure.
Medium voltage (MV) cables are typically rated between . Selecting the right size is critical for safety and efficiency, often based on standard ratings like 5kV , 15kV , or 35kV . Medium Voltage Cable Ampacity Chart (5kV - 35kV)