Ned Simmons wrote:



310.4 Conductors in Parallel.
(A) General. Aluminum, copper-clad aluminum, or copper
conductors of size 1/0 AWG and larger, comprising each
phase, polarity, neutral, orgrounded circuit conductor shall
be permitted to be connected in parallel (electrically joined
at both ends).

I read that to mean you can run 1/0 and larger conductors in parallel
if they're run together. 12 ga romex daisy-chained around the
perimeter of a room with both ends tied to the breaker would be (1)
too small and (2) not "within the same raceway, auxiliary gutter,
cabletray, cablebus assembly, trench, cable, or cord."


The question is, is a "ring" really parallel conductors. I could
argue it either way.

jk