Let me fix this:AlbertaA: The 220 volt cable that goes into your garage should have a white neutral wire.
If a neutral exists then yes, it can be used to create a multi-wire circuit (shared neutral).If so, would it be feasible for AlbertaA to just replace the ganged breakers in his panel with two 15 amp breakers, and use the white wire as a common neutral? I don't see why not because it WAS being used as a common neutral for a presumably higher amperage application previously.
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