One gross violation of 312.5 (C) that is shown in electrical publications, as if it is not a violation, involves the advetising by a cable company that introduced NM in different colors.
They show a panel with a all the NMs entering through a single 2 inch knock out.
Even the IAEI in their advertising show a white wiskered old man with his white hard hat looking at a panel with all the NMs entering a single knock out.
I have had contractors try to get by with six inch stubs and inside walls thinking this complied with the Code.
It does not !
