Because the Cutler Hammer BR combo AFCI breakers are longer than standard breakers I decided to do a little test fitting. My original concern was that the ground bar would be covered so there would be a desirable installation sequence in order to avoid having to remove the breaker from one circuit to connect the ground for another.
It looks like the ground bar actually interferes with the installation of a combo AFCI breaker, so on a BR2020 panel with a GBK1420 in the standard position most of the slots on one side are not suitable for combo AFCI breakers. Given the broad requirements for AFCI breakers this could be a problem. Possibilities seem to be to use a smaller ground bar (maybe GBK10) or a bigger panel, but am I missing something? I assume mounting the ground bar in a non-standard position would void the listing. It appears that SquareD Homeline could have the same issue.
Dan Lanciani ddl@dalan.*com