What Is Thhn Wire
THHN wire is a type of insulated building wire recognized for its extensive use in construction projects across residential, commercial, and industrial sectors. It is one of the most common conductor types found in North America for carrying electrical current within a structure. Choose THHN if your installation is in a dry environment with high temperatures.
Choose THWN if youre installing cables in wet or damp conditions and want maximum flexibility. THHN (Thermoplastic High Heat-Resistant Nylon-coated) features a PVC insulation base covered with a tough nylon jacket. The nylon outer layer provides excellent abrasion resistance, chemical resistance, and protection during installation.
A: Thermoplastic High Heat-resistant Nylon-coated (abbreviated as THHN) wire is a commonly used building wire in various electrical applications. It contains copper conductors and additional protection in the form of a nylon sheath. In the electrical wire industry, terms like THHN wire, THWN wire, and THW wire indicate specific features, materials, uses, and safety ratings.
This post will help clear the air by explaining these common electrical wire acronyms. Basically, THWN wire is a wire that can be used in high heat situations (up to 75C or 167F) and in both dry and wet conditions. This wire is insulated by thermoplastic wrap and is additionally coated with nylon to give it high heat and water resistance.
