Again ... the section I cited also refers to line to line loads, and the handle tie being adequate.
I believe that the multiplicity of circuit types is detailed for the 'lower voltage' arrangements simply because of one that is NOT listed: the 240 Delta. Such panels ought not have any single pole circuits in them.
Here's the paragraph right after the one I quoted:
"Single pole or multi-pole independent trip circuit breakers, with handle ties, rated 120/240 v ac, are suitable for use on multi-wire circuits with line-to-line or line-to-ground connected loads."
As mentioned, that's the text of the White book itself; I'm still confused as to what the "Marking guide" is discussing.
No matter how you slice it, the White book is pretty specific in stating that handle ties DO qualify as a disconnecting means.
