THHN vs. XHHW Wiring: Differences & Best Applications

• Wire
• Cable
• NNC
• Electrical

• 

  Garrie Nassau

  2/14/25, 4:44 PM

  
  
  

  What are the pros and cons between THHN and  XHHW cable? All the details here:

  THHN (Thermoplastic High Heat-Resistant Nylon-Coated)

  • Best for: Dry indoor locations and conduit installations.
  • Pros: Affordable, lightweight, easy to install.
  • Cons: Less moisture resistance, not ideal for outdoor use.

  XHHW (Cross-Linked High Heat-Resistant Water-Resistant)

  • Best for: Outdoor, wet, and high-heat environments.
  • Pros: Thicker insulation, water-resistant, durable.
  • Cons: Slightly more expensive and less flexible.

  Take this into consideration

  • Use THHN for cost-effective indoor projects.
  • Use XHHW for outdoor, underground, or wet areas.
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