There DO exist 'combination' 2-pole AFCI's, at least from two makers. Square D seems intent on discouraging the use of all MWBC's. I'm beginning to see where some of the recent code changed relating to MWBC's comes from.
That leaves the elusive AFCI device. Anyone have a picture of one?
Reno: "That leaves the elusive AFCI device. Anyone have a picture of one?"
Popular consensus is that there is no such animal, yet!
BTW, my thought to to the 'metalic raceway xx feet to an AFCI could be interperted as within a structure that has an obsolete panel, a subpanel could be installed...with a metalic raceway of xx feet. That would kind of make sense of this NEC reference.
After sending the 2 pole combination link from Siemens web page to my wholesaler (GE distributor) he started beating the bushes and came back assuring me that GE had them in the works. I won't be pulling any multiwire homeruns to the bedrooms until I have one in my hand though.