GE THQL Breakers and panels are protected from installing too many breakers by design of the half-size "non-CTL" breakers to only be compatible with, say, 20 space panels. Older design GE's aren't compatible at all.
The bus attachment point looks like this: -|-
rather than the single: |
Check the listing on this, but Cutler Hammer and Sq D Homeline make tandems that will fit into a GE bus.
