[EricH]

I disagree with Jason. I interpret "shall be" to mean "you must do it this way", and with the other wiring rules using "minimum" to refer to a wire gauge (i.e., you can use larger wire, but you have to use wire), so no bus bar.

Given that two experienced FIRSTers with inspection experience disagree, I strongly recommend Q&A (nobody's asked this one yet)--and then make sure to bring documentation with you, including the Q&A, at the event if it is ruled legal.