Installed 4 quad boxes in hallway off of kitchen - each box connects to a 4" work box in the basement below via 1" smurf tube. The 4" work boxes are also connected via 1/2" EMT. Most of the circuits go up from the boxes - in some cases, the quad boxes act as pass throughs. All 16 spots are in use (although one has a pair of indicator lights for lights that are not visable from this point.)