wrote in message ...
On Friday, November 22, 2013 4:37:03 AM UTC-5, Danny D'Amico wrote:


I'm not sure what that means though...

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. Just saying AB is meaningless, because it could
mean A is on the left, B on the right, or it could mean A is above,
B is just below it. In any case, what you have, is the latter.
That is what is shown in your diagram.
Otherwise you would get zero from a double pole breaker instead
of 240V.

This is correct. My issue with the example provided was that there
were an A phase and a B phase shown, inline, left to right. I have
yet to see a panel with this layout. Even with three phase panels,
the layout is A, B, C. Top to bottom, identical on both sides of
the panel. The only deviation that I have seen is when the bus
tabs are used for the main breaker input, and this only causes the
loss of two connection points in the panel. This is a very common
practice in MCC distribution panels. So, 22 circuits... :-)