What Is Thhn Wire?

THHN

THHN is an acronym for Thermoplastic, High Heat resistant, Nylon jacket insulation. This is one of the most commonly used insulation on wire.

Thermoplastic

Thermoplastic is a PVC material, which makes it a thinner insulation than most other types. Thermoplastic also emits toxic smoke when it gets hot enough to burn, so the installed wire shouldn't be exposed.

High Heat

It is important to know the temperature at which the insulation will break down. HH means the insulation will withstand a 90 C (194 F) temperature.

Nylon

Protecting the thermoplastic is a nylon jacket. The nylon also makes installation easier because the wire will slide freely through conduit.

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