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" [Linked Image]

part of 300.4(F)
Quote
(F) Insulated Fittings. Where raceways containing ungrounded conductors 4 AWG or larger enter a cabinet, box enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place.

How about it is there something I am overlooking? [Linked Image]

Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts