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-   -   Damaged Nylon Sheath on THHN - does it matter? (http://www.diychatroom.com/f18/damaged-nylon-sheath-thhn-does-matter-159343/)

raybo 10-07-2012 10:35 PM

Damaged Nylon Sheath on THHN - does it matter?
 
Hi All,

After pulling some lengths of 3/0 and #3 copper cable, the wire coming out the final end of the conduit (wrestled past a couple LB's as well) the thin outer nylon sheath was torn in a few places. The underlying PVC insulation is in perfect shape without any abrasion whatsoever, so I do not have any strong concerns.

I know the outer sheath is intended to protect the cable and ease in pulling, but am wondering if it's removal where it has separated from the cable de-rates the insulation value at all?

Thanks!

mpoulton 10-07-2012 10:51 PM

I have always assumed that damage to the sheath is acceptable. Even new wire right off the spool often has defects in that layer, and it's so easily damaged it can't possibly be all that important.

ddawg16 10-08-2012 01:30 AM

I agree with mpoulton....in fact, I have always looked at that sheath as the way of making the wire easier to pull.....it's really too thin to provide any type of protection and isolation....the underlying insulation does that.


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