Also, remember in newer boxes, it's three slots of
Q22-CD,
with the rest Q22-Q22. Older boxes can be wired for either
IIRC that's true of the BA23 but the larger BA123 is four slots
of Q-CD and then serpentine Q-Q.
The even newer BA200 series (BA213/BA214) and probably everything
after that (which is mostly just the BA400 stuff) is AFAIK all
Q-CD.
Antonio
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Antonio Carlini arcarlini(a)iee.org