I for one would be very happy if shared neutrals died a fast and painful death!!
No way, never.
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12/4 Cable and I are to good friends for us to part company.
Besides it makes no sense electrically to do away with MWBCs.
Once the branch circuits reach the panel it is common neutral all the way back to the source. The neutral bar is no better or worse than a wire nut. There is nothing in an electrical panel that makes a common neutral 'bad' on the load side and 'good' on the line side.
About all we can say is possible harmonic loads on the neutral but that will happen to the feeder neutral as well.
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Running all two wire circuits is wasteful of resources and give us greater voltage drop issues.
Bob
