A dual-rated conductor marked THHN/THWN is rated at what temperature when used in dry locations?

The dual-rated conductor marked as THHN/THWN is designed to handle higher temperature ratings under specified conditions. When used in dry locations, this conductor is rated at 90 degrees Celsius (194 degrees Fahrenheit). This rating reflects the ability of the insulation material to withstand elevated temperatures, which is particularly important in applications where heat generation may occur or where electrical load could contribute to increased temperatures.

The THHN designation indicates that the conductor is rated for 90 degrees Celsius in dry locations, while the THWN designation similarly covers wet locations but can also be rated for dry use. Therefore, both ratings reinforce the ability of THHN/THWN conductors to perform effectively and safely in various environments while maintaining a maximum temperature threshold of 90 degrees Celsius.

In contrast, the other provided temperature ratings do not apply to the THHN/THWN combination. The 60 degrees Celsius option represents a lower temperature rating appropriate for older or different types of wiring. The 75 degrees Celsius rating might pertain to certain types of conductors designed for specific applications but does not reflect the capabilities of THHN/THWN rated conductors. Lastly, the 95 degrees Celsius rating exceeds the established limits for this type of conductor under standard conditions and does not apply here