Electric outlets mystery

[John Terefenko]

Sound advice.

I believe multiwire branch circuits are still code compliant.

Not to my knowledge. All need own neutral. I know it is that way in commercial work.

[Charlie Velasquez]

Not to my knowledge. All need own neutral. I know it is that way in commercial work.

Wrt multiwire branch circuits, I believe 210.4 covers its use.
I think in at least one instance, a detached garage, if one wants to run power to it without running a sub panel, one could argue a mwbc is the only code compliant way to do it.

edit: this exact discussion is taking place on Mike Holt’s forum right now.

[Tom M King]

Shared neutrals were common practice, for decades, before Arc Fault breakers were required, and they found out that wasn't a good recipe.

I got my license in 1975, but only did the electrical work in the new houses, that I built one of for 33 years. I never felt comfortable with shared neutrals, so didn't use them. My houses built in the '70's, through the '90's, may have been some of the few built without shared neutrals. I was building spec houses, under no boss, so no pressure for fast, and cheap.