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    guest598's Avatar
    guest598 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 17, 2011, 01:14 PM
    Can THHN Wire be used in PVC under ground.
    Can THHN Wire be used in PVC under ground.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #2

    Dec 17, 2011, 01:26 PM
    No, THHN is listed (Article 300, Table 310.13(A)) as dry or damp areas.

    Earth is considered a wet area. Conduit, below ground level is also considered to be in a wet area.

    THHW, THW, THW-2,THWN, THWN-2 and TW are acceptable for wet areas.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #3

    Dec 17, 2011, 02:12 PM
    Check the wire you may have, most THHN is dual rated as THHN/THWN
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