Ok, it shows 2.25 in.3 for #12. Since you have 4, that's a total of 9. Clamps seem to be only for 1 clamp, rated at wire size so, clamps @ 2.25. 1 device = 2, you have 2. So 4 x 2.25, so that equals to 9, or it seems to be that way. For the grounding, you take the largest, which seems to be a #12 in your case, at 2.25 as well. It seems that jumpers and pigtails don't count.
So, if I'm not mistaken, 9 + 2.25+ 9 + 2.25 = 22.5 in.3 In terms of box fill, I'm going for 10?
Again, my first attempt, don't quote me on it.
[This message has been edited by DSpanoudakis (edited 10-05-2005).]
