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Iwire: Just how does a PVC bushing protect a wire from the edge of a PVC fitting?

It's rounded - the chamfered edge of a rigid PVC can easily cut the softer sheath on cable

Maybe I have been misinformed, here is the code section I am thinking of. I do not see anything that says only metallic raceways.

I have always used bushings with PVC but that proves only that "I have always done it that way"

part of 300.4(F)

How about it is there something I am overlooking?

Bob

Would the PVC conduit itself count as a "substantial insulating material that is securely fastened in place." ?

The edge on the male adapter can be as sharp as a knife (I've shed the blood to prove it), or might be rounded.
Nonetheless, there's no exclusion for PVC.

It's a very normal thing to see PVC run into the bottom of stand up sections that's just cut off with no fitting whatsoever. That's what "bell ends" are made for. If you order them from the wholesaler, they will usually be a back ordered item, so rare is their use.

Not only is there no exception in 300.4(f) for pvc but in 352.46 it requires bushings for any size wire when using pvc.

I was failed on a temp service for forgetting one bushing. The whole service was pvc and needed eight bushings total. We miss counted and paid for it.

Danson thanks for the lesson.

I was not aware of 352.46 now I know I have been violating the code in smaller sizes of PVC.

Bob