How are you interpreting “equipment grounding conductors, where installed,” as stated in 250.122[B] when ungrounded conductors are upsized?
Do you consider this as meaning where an EGC is actually pulled in a raceway, or simply where any EGC is present, whether physically pulled or part of a listed cable assembly, such as SER?

It seems that this could possibly be interpreted either way and might allow using an upsized cable assembly containing an equipment-grounding conductor sized only per Table 250.122, as opposed to a raceway where the conductors are pulled and the EGC sized on the ratio of the circular mil area of the upsized ungrounded conductors.
What is your take on this?

TKX