We follow that but here's what threw us: look at the cut & paste from the code ... what does the NEC mean by "ALL conductors of ALL feeders". Doesn't that seem to indicate every individual conductor of each set? Or do they interpret each set as a separate feeder? Or, again, are we just interpreting it wrong?
"Where installed in a metal raceway or other metal enclosure, all conductors of all feeders using a common neutral shall be enclosed within the same raceway or other enclosure as required in 300.20."