Just to expand on this a little more, for other than possibly a service or feeder application, is there anything that actually prevents manufactures from producing NM-B cables with reduced "neutrals" for use in branch circuits?
Such as, #12 with a #14 neutral conductor or #10 with a # 12 neutral, etc.
I seem to remember seeing some NM cables being made this way many years ago.
The only things I could see would be:
1) New tooling
2) New safety approvals
3) New packaging
4) New catalogs
5) New manufacturing BOMs
6) New literature to explain when one could and could not use the new material
7) More returns
8) More confusion
But aside from that, no I don't think there is any physically preventing manufacturers from producing this product.
