doubling neutral wires in ground bar in panel

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Many electricians in this area used to run 12-3 for two bedroom circuits for example. I used to also, but I haven't for a long time, and I don't think I've seen it recently. What would be the difference of that and wire nutting two opposite phase circuits' neutrals and landing them in one neutral bar hole? Thanks
 
Stevenfyeager said:
Many electricians in this area used to run 12-3 for two bedroom circuits for example. I used to also, but I haven't for a long time, and I don't think I've seen it recently. What would be the difference of that and wire nutting two opposite phase circuits' neutrals and landing them in one neutral bar hole? Thanks
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Electrically you've created a MWBC so those rules would apply. Otherwise nothing wrong with a making a MWBC unless you hate MWBC's.
 
Yes, there is (something wrong with making a MWBC). You're not allowed to parallel smaller conductors.

Besides, if you've already run two 12-2's, there are disadvantages, and no advantage, to creating a MWBC.
 
LarryFine said:
Yes, there is (something wrong with making a MWBC). You're not allowed to parallel smaller conductors.

Besides, if you've already run two 12-2's, there are disadvantages, and no advantage, to creating a MWBC.
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Are you saying that you cannot use two 2-wire cables and make a MWBC at the panel by pigtailing the neutral? This is often done in old panels where there are not enough holes in the neutral bar.
 
Sorry. In the panel only, yes, but you still now must use a 2p breaker or handle tie, and somehow must make sure the two circuits' hots are never placed on the same line.
 
infinity said:
Are you saying that you cannot use two 2-wire cables and make a MWBC at the panel by pigtailing the neutral? This is often done in old panels where there are not enough holes in the neutral bar.
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Is a good way to deal with not enough holes in the neutral bar, but:

LarryFine said:
Sorry. In the panel only, yes, but you still now must use a 2p breaker or handle tie, and somehow must make sure the two circuits' hots are never placed on the same line.
Click to expand...
 
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