thhn

Electrical wiring in North America follows the regulations and standards applicable at the installation location. It is also designed to provide proper function, and is also influenced by history and traditions of the location installation.
The US National Electrical Code is applicable to many areas in the US where state, county or local authorities have adopted it. For electrical wiring in Canada, the Canadian Electrical Code is a very similar standard published in Canada by the Canadian Standards Association.

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  1. ThomasB

    Overhead triplex feeder termination question

    I have 6-6-6 triplex overhead that I'm running to a detached garage. At the weatherhead at the garage I'm going to splice 8 guage thhn copper to run down to the sub panel (approx 5' max of 8 guage at both ends of the run). This feeder will be on a 50a breaker. Does anyone see any issues with...
  2. T

    THHN vs Romex behind drywall - why the difference

    THHN is supposed to be enclosed in conduit when behind drywall. Romex does not have the same requirement. Romex is "basically" THHN encased by a secondary sheath. Does this sheath really make that much difference such that THHN must be in conduit but Romex does not? Does that thin layer of...
  3. K

    should I use THHN wire or NM rommanx wire?

    I used 1 inch emt conduit in the garage for 50 amp circuit for ev charger. I plan to use 4AWG wire. Please let me know which wire is est for passing through conuit, I also have less than 3 feet wire goes in the wall

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