What does the abbreviation "THHN" stand for in electrical wire types?

The abbreviation "THHN" stands for Thermoplastic High Heat-resistant Nylon-coated. This designation provides specific information about the properties and applications of the wire. The term "Thermoplastic" indicates that the insulation material can be melted and reshaped when heated, allowing for flexibility in manufacturing. "High Heat-resistant" signifies that the wire can operate at elevated temperatures, making it suitable for various applications, particularly in environments where heat may be a concern.

Additionally, "Nylon-coated" highlights that the wire is covered with a nylon material, which offers enhanced protection against abrasion and chemical exposure, further extending its durability and performance in different settings.

Overall, this combination of characteristics allows THHN wire to be widely used in building and construction for various electrical applications, making it a preferred choice among electricians and contractors.