Product Corner – THHN

With the seasonal ramp-up in homebuilding and commercial construction projects, you may be seeing an uptick in the demand for building wire. Among the most popular solutions for power distribution throughout structures is THHN. THHN building wire is generally used to carry electrical current to all circuits of power in a building or dwelling. Variations of THHN are utilized in the electrical plans of almost every industrial, residential, and commercial building.


Copper THHN

THHN stands for Thermoplastic High Heat-resistant Nylon coated. THHN is available in stranded or solid conductors depending on the size. It is either manufactured in copper or aluminum and covered in PVC (polyvinyl chloride) insulation with a nylon jacket. THHN is UL listed with a rated 90 degrees Celsius in dry locations or 75 degrees Celsius in wet applications with a THWN rating. The vast majority of THHN building wire carries a dual rating on the cable marked THHN / THWN for both the wet and dry temperature rating. In industrial applications, THHN is often used in the wiring of machine tools, control circuits, and the manufacturing of common household appliances/electronics.

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 types 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.

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