The question came to me about how far must the NM cable sheath enter the boxes? I could only find the information located in 334.15(C). Nothing about entering the box sans the conduit. My answer would be, the sheath must extend beyond the clamping device be it a non-metallic box or a metal one. The person calling me was concerned because his boss wants the sheath to be at least 3/4" into the box.
There's got to be more important things than this dispute.

George:
From 314.17 (C) of 2014 NEC.....

Where nonmetallic sheathed cable or multi-conductor Type UF cable is used, the sheath shall extend not less than 6 mm (1/4 in.) inside the box and beyond any cable clamp. In all instances, all permitted wiring methods shall be secured to the boxes.

1/4" in english

Yep, 1/4" minimum.

Thanks Guys. You are the best. I would have expected it to be in Article 334 but it wasn't. HEY Inspectors have every right to be wrong :)) And I'm probably one of the few that would admit it.

That's what this BB is all about.

George:
As I say to some..."I'm human, I do make mistakes too"

I guess it is because there is more than one kind of cable and they were trying to avoid the mess that was created when they put a cable rule in 320 and referred to it in all the other cable articles. (like accessible attics in 330.23 334.23 etc)