What is the insulation temperature rating of type THHN wire in a damp location?

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Multiple Choice

What is the insulation temperature rating of type THHN wire in a damp location?

Explanation:
THHN insulation is rated for 90°C. That temperature rating applies whether the conductor is in a damp location, because THHN is designed to handle high temperatures in conduit installations, including damp environments. The other options don’t fit because 60°F isn’t a standard insulation rating, 140°F would exceed the rated capability, and 75°C is the lower rating used for some other insulation types (like THWN/THWN-2) rather than THHN.

THHN insulation is rated for 90°C. That temperature rating applies whether the conductor is in a damp location, because THHN is designed to handle high temperatures in conduit installations, including damp environments. The other options don’t fit because 60°F isn’t a standard insulation rating, 140°F would exceed the rated capability, and 75°C is the lower rating used for some other insulation types (like THWN/THWN-2) rather than THHN.

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