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?
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.
Even if you are on the right track, you will still get run over if you just sit there.