All guides
THHN vs XHHW Wire
A practical comparison of THHN and XHHW insulation systems for conduit runs, wet locations, and temperature performance.
Direct answer
THHN is common for dry and many conduit applications, while XHHW is often preferred where wet-location performance and robust insulation characteristics are required.
Buyer decision rules
- Check the exact conductor marking because dual-rated conductors can change installation flexibility.
- Prioritize wet-location compatibility when conduit can collect moisture.
- Review termination temperature ratings to ensure ampacity assumptions match device limits.
- Align insulation choice with chemical, abrasion, and project lifecycle demands.
Related manufacturers
Related product searches
FAQ
Can THHN be used in wet locations?
Many conductors sold as THHN are dual-rated, but you should verify the exact marking to confirm wet-location suitability before installation.
Does insulation type change voltage drop calculations?
Voltage drop is primarily driven by conductor size, material, and run length, but insulation ratings still affect allowable installation conditions and ampacity assumptions.