THHN wire is a 600 volt building wire rated for use in dry locations at temperatures up to 90°C (194°F), or wet and oil/coolant applications at temperatures up to 75°C (167°F). Remington Industries stocks THHN building wire in 12 AWG and 14 AWG, with a bare copper conductor, PVC insulation, and a nylon jacket, available in solid or stranded construction.
What is THHN wire?
So, what is THHN wire? THHN stands for Thermoplastic High Heat-resistant Nylon-coated wire, a type of building wire recognized under the National Electrical Code (NEC) and UL-listed for voltages up to 600 volts. As a single-conductor 600V wire with PVC insulation and a nylon outer jacket, THHN offers a reliable balance of heat resistance, abrasion resistance, and flexibility, making it one of the most widely used wire types in commercial and residential construction.
The Construction of THHN Wire
Remington's THHN copper wire features a bare copper conductor for strong conductivity, wrapped in PVC insulation and a nylon jacket that resists nicks, scrapes, and moisture during installation. This THHN electrical wire is available in 12 AWG and 14 AWG gauges, with a choice of solid or stranded conductor construction, and comes in black, green, red, or white to help color-code circuits and stay organized on the job.
600v Wire Applications
THHN building wire, sometimes referred to as THHN cable, is commonly installed in conduit and raceway systems for branch circuits, services, and feeders in both commercial and residential construction. Its 600 volt wire rating and dual temperature ratings (up to 90°C in dry locations and 75°C in wet or oil/coolant environments) make it a dependable choice for a wide range of interior wiring applications.
THHN vs. Wet-Location-Rated Wire
It's worth noting that standard THHN wire is rated differently from THWN-2, a separate wet-location conductor type rated for 90°C in both wet and dry conditions. Because THHN's wet-location rating tops out at 75°C, please confirm that this 600V copper wire meets the temperature and moisture requirements of your application before installation.
Comparison Resource
If you need a comprehensive comparison between THHN and other wire types, view our Hook-Up Wire Data Chart. In need of a custom length or other value added services? Contact our team to discuss your specific application for 600 volt wire and the wide range of wire processing services that will help us meet your needs.
