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The 12/3 circuit you're inquiring about is called a multiwire circuit and since there's a 240 volt potential involved with sharing the neutral, it makes it more dangerous for the DIYer when connecting or working on this type of circuit. I wouldn't even bother with doing it this way. Instead run two separate 12/2-G cables and connect each one to it's own breaker in the panel. If they're on the same buss or opposite busses it won't make a difference since the load is not great. To ensure they're on separate busses depends on how your panel is manufactured, but usually if you install the breakers on the same side of the panel, one on top of the other you will be fine. Usually everyother breaker is on the same buss.
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