I guess I'll have to throw a bit of fodder around to stimulate a response here. The only grumblings I've heard have suggested articles 90.7 & 110.2.
90.7 Examination of Equipment for Safety
“For specific items of equipment and materials referred to in this Code,” (Charging first statement)
110.2 Approval
The conductors and equipment required or permitted by this Code shall be acceptable only if approved.
I have not found any specific reference to this equipment & "Approval" appears to be based upon 90.3. Rebuttals? Agreements? Opinions?