THHN Wire
THHN (Thermoplastic High Heat-resistant Nylon-coated wire) is recognized for its endurance and fire-resistant properties. The wire comprises a well-conducting metal core (usually copper or aluminum) that is insulated using polyvinyl chloride (PVC). This PVC insulation is then further jacketed with heavy, tough nylon. The wire is so-named after its three primary components (insulation and two coatings). It is a durable workhorse of wires, designed for a range of wiring environments and types of buildings.
Emphasizing specific features of the THHN wire, like the nylon coating, can add another layer of protection against the high abrasion, chemicals, and moisture the wire faces as it serves its purpose. This coating assures the wire will continue to work wherever it is installed, especially in places with particularly harsh conditions. THHN wire can used in branch wiring, branch circuits, as electrical wire, hook up wire and building wire. Multiple THHN wires can be bundled together and sheathed in PVC to create THHN cables.
FAQs
Are THWN wire and TFFN wire used for the same applications?
While both types of wire can sometimes be found in similar applications such as control circuits or machine tools, THWN is generally better suited for environments that might expose the wire to water or higher temperatures. TFFN, on the other hand, is more often used in lighter, indoor applications requiring flexibility.