Cable Derating Factor !link! 〈2024〉

Standard soil is 1.2 K·m/W (e.g., damp clay). Dry sand or backfill can be >2.5 K·m/W.

| Depth | Factor (up to 10kV) | |-------|---------------------| | 0.5 m | 1.00 | | 0.8 m | 0.96 | | 1.0 m | 0.94 | | 1.5 m | 0.90 | cable derating factor

$$\textEffective Capacity = \textTabulated Capacity \times C_a \times C_g \times C_i \dots$$ Standard soil is 1

Ignoring derating factors is a leading cause of unexpected cable failures, nuisance tripping, and reduced system lifespan. Standard soil is 1.2 K·m/W (e.g.

Note: For high temperatures >55°C, special cables are required.

For a given installation, calculate the total derating factor before selecting conductor cross-section.