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Explanation: According to the NEC ALL conductors of a circuit must be in the same cable/conduit/whatever. Most other countries only require the active and neutral conductor in this clause (for a good reason) and specifically exclude the ground wire, so you're allowed to do that in other places! For that reason I might be tempted to wire that way if I can't do a full rewire. It's not 100% up to code but gives you full safety. That's one of the few points where I don't agree with the NEC.