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Answer for USA, Canada and countries running a 60 Hz supply service.

This is very common in commercial and industrial installations. You must be sure that your two breakers are fed from different phases or legs of your electrical service. Having both circuits fed from the same phase or leg might cause the neutral to melt and cause a fire without tripping any breakers.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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Q: Is it a good idea to run two 20 amp circuits on their own 20 amp breakers but using only one 12 3 w gnd romex cable Only one white wire would be available for two different circuits?
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