What is the maximum temperature rating of a THHN conductor in a dry location?

The maximum temperature rating of a THHN (Thermoplastic High Heat-resistant Nylon-coated) conductor in a dry location is 194°F. This rating is specified in the National Electrical Code (NEC), which establishes guidelines for safe electrical installations. THHN conductors are designed to withstand high temperatures and have properties that make them suitable for various applications, particularly in dry areas where moisture is not a concern.

While THHN is known for its performance in heat resistance, when determining its maximum temperature rating, it is crucial to refer to the appropriate standards. The 194°F rating ensures that the conductor operates safely within its limits, preventing insulation breakdown and potential hazards that could arise from overheating. This temperature threshold is essential for maintaining electrical integrity and is a fundamental aspect of selecting the right conductor for your specific application.