What type of insulation does THHN wire have?

THHN wire is equipped with thermoplastic insulation, which is designed to be flexible and resistant to heat and moisture. The thermoplastic material allows for easy handling and installation, as it can be softened by heat and easily molded into shape. This type of insulation provides excellent protection against various environmental factors, including chemicals and abrasion, making it a preferred choice in many electrical applications. The adaptability and durability of thermoplastic insulation are essential for ensuring the longevity and safety of electrical installations.