What is THHN?
THHN stands for Thermoplastic High Heat-resistant Nylon-coated wire. It is a standard type of electrical wire used in various building wiring projects, offering durability, flexibility, and heat resistance. The wire is composed of a copper or aluminum conductor, insulation made from thermoplastic material, and an outer nylon coating for added protection.
In residential and commercial settings, THHN wire is typically used in conduits or raceways for power distribution. It is rated for up to 90°C in dry locations and is known for its high conductivity and resistance to oil, gas, and chemicals. Electricians often choose THHN for its versatility and compliance with National Electrical Code (NEC) standards. For example, it is widely used in wiring lighting fixtures, appliances, and control circuits.
