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    mr500's Avatar
    mr500 Posts: 181, Reputation: 8
    Junior Member
    		  
    #1

    Apr 18, 2008, 07:42 PM
    Thhn/Thwn Wire
    What's the difference in THHN/THWN besides the W for wet locations. Are these one in the same wire? I see it advertised as such. Sometimes with and with out the THWN part. Just really curious about this

    M
    Washington1's Avatar
    Washington1 Posts: 798, Reputation: 36
    Senior Member
    		  
    #2

    Apr 19, 2008, 11:23 AM
    Quote Originally Posted by mr500
    Whats the difference in THHN/THWN besides the W for wet locations. Are these one in the same wire? I see it advertised as such. sometimes with and with out the THWN part. Just really curious about this

    M
    Hope this helps:


    THW-2: Thermoplastic Insulation (usually PVC), Heat Resistant (90°C rating), suitable for Wet locations.


    THWN-2: Same as THW except Nylon jacket over reduced insulation thickness. Also rated THHN.




    THHN: Thermoplastic Insulation (usually PVC), High Heat Resistant (90°C rating), dry locations only, Nylon jacket. Also rated THWN.

    Key: Suitable for wet locations THWN
    Key: Not suitable for wet locations THHN

    People think they can run Thhn in coduit in wet locations, but they can't. Unless it has a dual THHN/THWN rating
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    Apr 19, 2008, 11:56 AM
    As a quick note, yes, today's they are one in the same. You will be hard pressed to find single rated THHN or THWN. Pretty much all THHN is dual rated with THWN.
    mr500's Avatar
    mr500 Posts: 181, Reputation: 8
    Junior Member
    		  
    #4

    Apr 19, 2008, 02:18 PM
    I was thinking they were the same. BUT I'm going to make cure it reads that on the sheathing I hate to do this twice. BUT Im sure its all the same with the new stuff out today.

    Thanks Been a great help Off to spend that 1.78ft and dive into this stufff!

    Mike
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