I agree, no foreign wires are to be passed through the transformer. I expect that there will be many who wear the AHJ hat that will agree. It is also common knowledge that all conductors are not to be passed through an area that originates in the top section -- the label in the transformer enclosure will cleary identify this and other restrictions.
Joe Tedesco, NEC Consultant
#80764 - 05/16/0211:39 PMRe: Transformer as a raceway?