Which insulation is appropriate for individual overhead conductors that are not near any buildings?

The appropriate type of insulation for individual overhead conductors that are not near any buildings is thermoset type insulation. Thermoset materials are known for their superior thermal stability and resistance to environmental factors such as UV rays, moisture, and temperature extremes. This makes them particularly suitable for overhead applications where they are exposed to the elements and where longevity and durability are critical.

In comparison, thermoplastic type insulation, while offering flexibility and ease of installation, may not provide the same level of resistance to heat and environmental degradation as thermoset insulation. For overhead conductors that face constant exposure to the atmosphere, thermoset insulation's characteristics give it a distinct advantage in ensuring safety and preventing failures due to insulation breakdown.

Additionally, while a combination of both types could theoretically provide benefits, it is generally more practical and effective to select a single, reliable insulation type like thermoset for overhead use. This ensures uniform performance characteristics throughout the conductor, aligning with safety standards and NEC requirements regarding the durability and reliability of conductors in overhead applications.