THHN Wire
THHN wire is a type of electrical wire that's widely used in various applications, including residential, commercial, and industrial settings. Made of a copper conductor, it usually features a thermoplastic insulation made of PVC, as well as a nylon jacket that offers added protection and ease of installation. The letters THHN stand for "Thermoplastic High Heat-resistant Nylon-coated," denoting its primary characteristics and suitability for different environments.
In residential and commercial buildings, THHN wire often serves as building wire for tasks like wiring electrical outlets, switches, and lighting fixtures. It is primarily designed for dry locations but can withstand temperatures up to 90°C. The wire is often found in conduit or raceways and is commonly used for both branch circuits and control circuits. For applications requiring water resistance, you can opt for a dual-rated wire known as THHN/THWN, which is suitable for both wet and dry conditions.
The nylon jacket makes the wire resistant to oil and certain hazardous substances, enhancing its durability. This jacket also makes it easier to pull the wire through conduit, an important consideration for any installation. Stranded copper variations of the wire are often used in applications requiring more flexibility, like machine tools.
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