What does THHN stand for in terms of conductor type?

THHN stands for Thermoplastic High Heat Resistant Nylon. This designation refers to a type of insulated electrical wire that is widely used in residential, commercial, and industrial installations. The "Thermoplastic" aspect indicates that the insulation is made from a plastic material that becomes pliable when heated, allowing for easy installation and manipulation of the wire.

The "High Heat Resistant" portion signifies that the insulation can withstand elevated temperatures, making it suitable for various applications where heat exposure might be an issue. Finally, "Nylon" refers to the type of coating used for the insulation, which provides additional durability and chemical resistance. This combination makes THHN wire ideal for a range of environments, ensuring both safety and performance in electrical systems.