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In your house wiring the neutral conductor can be shared between 2 circuits that are on opposite hot legs. A shared neutral only needs to carry the amperage difference between the loads on the 2 circuits. If both circuits are drawing 15 amps the neutral carries 0 amps. If 1 circuit draws 15 amps and the other draws 5 amps the neutral carries 10 amps.
If you power both legs from the same source (EG) and load 2 circuits that are sharing a neutral, the neutral will need to carry the combined amperage of the 2 circuits. Proceed with caution, you could overload (overheat) some house wiring.
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