What is the main difference between THHN and THWN wire?

• Wire
• Cable
• NNC
• Electrical

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  Garrie Nassau

  7/8/25, 4:27 PM

  The THHN (Thermoplastic High Heat-resistant Nylon-coated) is used mainly in dry environments, while THWN (Thermoplastic Heat and Water-resistant Nylon-coated) is suitable for both wet and dry locations. 

  Most modern THHN wire is dual-rated as THHN/THWN-2, making it more versatile for different environments. If you need a specific product reference, don’t hesitate to ask about it here!

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