2 pole breakers for multiwire branch circuits?

[LarryFine]

Furthermore i didn't fully read the site rules and wasn't aware if there's a code book possession requirement.

Please understand it's the site's owner, Mike Holt, who made the rules as a matter of liability.

He wants to make sure only those in electrical trades participate because of potential risks.

He can't assume that non-professionals know the rest of the stuff they're not asking about.