[best] | Cable Derating Factor

( k_temp \times k_group \times k_depth \times k_soil \times k_altitude \times \dots ) 3.1 Ambient Temperature ((k_temp)) Higher ambient temperature reduces heat dissipation.

| Soil Type | Thermal Resistivity | Derating Factor (vs 1.2 baseline) | |-----------|--------------------|------------------------------------| | Wet clay/loam | 0.8–1.0 | 1.05–1.10 | | Normal soil (baseline) | 1.2 | 1.00 | | Dry sand/gravel | 2.0–2.5 | 0.70–0.85 | | Concrete backfill | 1.0 | 1.00 | Deeper burial reduces cooling due to higher soil thermal resistance. cable derating factor

Note: For high temperatures >55°C, special cables are required. When multiple cables run together, each heats its neighbors. ( k_temp \times k_group \times k_depth \times k_soil

For a given installation, calculate the total derating factor before selecting conductor cross-section. This report is for informational purposes. Always follow local electrical codes and standards. When multiple cables run together, each heats its neighbors