What is THHN Wire?

Among the most popular single-conductor solutions for power distribution throughout structures is THHN. Most folks think of THHN as their go-to building wire for carrying electrical current to all circuits in a building or dwelling. However, electrical engineers and contractors often use power-sized THHN (8AWG – 750MCM) for supplying power and control in large scale applications. THHN serves as a simple solution for machine tools, appliances, automation, and branch circuits that require high volume power delivery. Variations of power sized and circuit sized THHN are utilized in the electrical plans of almost every industrial, residential, and commercial building.

What is THHN Wire?

THHN stands for Thermoplastic High Heat-resistant Nylon coated. THHN is available in stranded or solid conductors depending on the size. It is available in copper or aluminum and covered in PVC (polyvinyl chloride) insulation within a nylon jacket. The vast majority of single conductor THHN wire carries a dual rating on the cable marked THHN / THWN for both the wet and dry temperature rating. THHN is UL listed with a rating of 90 degrees Celsius in dry locations or 75 degrees Celsius in wet applications with the THWN designation.

THHN wire has several key distinctions compared to other building wire products. THHN uses a thinner PVC insulation which is a key factor in terms of its wide variety of electrical properties and uses. THHN lacks the flexibility of some other products due to its durable nylon coating. This rigidity can often be a plus many for contractors and end-users as its easy-feeding nature saves time during installation. THHN building wire has really grown in popularity due to it being a cost-effective alternative when compared to other variations of building wire. In most situations, electricians who use THHN building wire find these products to be effective, budget-friendly solutions that meet/exceed project specifications.

THHN Applications

Contractors often use THHN wire to power lighting and electrical outlets in buildings. Common residential and commercial applications include appliances, water heaters, and HVAC. The wire’s resistance to oil, water, grease and other chemicals and contaminants also makes it safe and effective for industrial applications. This durability also makes it a good call for exterior lighting and commercial uses. Underground installation is handled by using conduit for protection. The versatility of THHN makes it a great option for almost any application, indoors our outdoors.

DWC Has Power Sized THHN!

At DWC, our amazing supplier network allows us to stock a full range of THHN Variations. We’ve recently expanded our inventory of power-sized THHN (8AWG – 750MCM) for heavy duty power transmission in commercial and industrial applications. With great service, cut-to-length orders, and speedy fulfillment, DWC is your first place to go for popular THHN building wire varieties.

Contact your Account Manager today at 888-439-2947 or log into your fastQuote account to use DWC’s easy customer portal for wire & cable quotes in about 6 minutes.