Differences Between THHN & THWN Wire

THWN

Water resistance is a major reason for the use of THWN wire. These cables are installed in environments where a conduit is not mandatory, this additional flexibility makes it the preferred cable among electrical contractors, given that both wire types need not be carried. Stand-alone THWN cables are coated in PVC, as opposed to vinyl, to assist in water resistance.

THHN

THHN wire is the original version of the dual-rated cable. Designed to withstand heat up to 194 degrees Fahrenheit, this resistance drops to 167 degrees if oil exposure occurs. THHN wire is typically two-conductor, and found in the familiar ROMEX®,-style cabling that laces all homes and other structures. For underground and conduit-free installations, the UFB variant should be chosen.

MWR

Machine wire rated (MWR) wire often has the dual THHN/THWN rating stamped on its nylon or PVC jacket. This wire is often found in smaller gauges, and sometimes with tinned ends for ease in soldering. The uninsulated version is not THHN/THWN rated, and is used in the creation of windings for power supplies and motors.

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