On Fri, 22 Nov 2013 05:58:03 -0800, wrote:

It's referring to where the two legs/phases show up in the panel.
But, I'm not sure what AB means either. You need to define what
the perspective is.

I'm going to make a stab at *guessing* what A & B are in my
main breaker panel.

Is this correct?
http://farm8.staticflickr.com/7294/1...3c991e33_o.png