What Is Thhn Stranded Wire

Stranded wire types are available in various specifications and standards, and THHN stranded wire is one such type. THHN stands for Thermoplastic High Heat-resistant Nylon coated wire, and it may be available as either stranded or solid wire. They are available as either aluminum or stranded copper wire, and are often covered in polyvinyl chloride (PVC) insulation with an additional nylon jacket, and rated according to the American Wire Gauge (AWG). So, for instance, you may find copper or aluminum 12 gauge wire labelled as THHN.

THHN Stranded Cable is used in either dry or damp/wet applications. For dry use, it is rated at 90 degrees Celsius, and has a 75 degrees Celsius rating for wet applications.THHN cables for later use (wet) are labeled as “THWN”, where the “W” indicates wet use.

THHN stranded cable is a popular wire of choice for building contractors, but it also has used in wring of control circuits, machine tools and certain types of appliances. Because of its cost-effectiveness, many electrical contractors prefer THHN stranded wire vs solid wire labeled as XHHW.