The derating factor is usually a decimal multiplier $\leq 1$. The specific factors vary by installation method, but the primary variables are:
Different regions approach derating with slightly different philosophies: cable derating factor
| Condition | Typical Factor Range | Most Common Value | |-----------|----------------------|--------------------| | Ambient temp >30°C | 0.70 – 0.95 | 0.87 (40°C, XLPE) | | Grouped (2–5 cables) | 0.60 – 0.85 | 0.70 | | Dry soil backfill | 0.70 – 0.85 | 0.75 | | Buried >1m deep | 0.90 – 0.96 | 0.94 | | Altitude >1000m | 0.90 – 0.95 | 0.95 | The derating factor is usually a decimal multiplier $\leq 1$
This report is for informational purposes. Always follow local electrical codes and standards. cable derating factor