As an inspector, I was wondering if these system installers take a permit out to install their equipment?
Maybe they just stand there and tell you what to do with their stuff?
Chiming in on this one a bit late - but the wire size would need to remain consistent throughout - OCP to fixture. The modules in homeworks do not limit current or act as OCP in any way. And 15A circuits make little use of the modules capacity so assume #12 throughout... Or you'll end up with more modules, and more runs.
Further advice as the OP hasn't dealt with this system before:
Make sure this "Installer" plans his loads, and panel schedules prior to you installing and running wire, and double check his calc's - His load swapping later only makes you look bad! Especially in the finishing stages of work. And dont forget to check for AFCI required circuits for their grouping...
The room or area where these panels will go are going to be jamb packed. You can save some pulling with the use of 12/4 (two circuit), and occasional conduit. Do your best to claim a common wall all the way up and take it over so you get the easiest pulling with the least drilling. As you'll see there will be an enourmous amount pf pulling all those switch legs - on top of all your home runs for power.
As these things are all 2 wire circuits all are CCC's (Again note #1), try to bring all the appropriate cables over their respective panel, but also suggest 4X or 6X gutter above all (for the inevitable load swapping), and/or 14X14X4 j-boxes between the gutter and panels for spicing if necessary. Terminate all grounds in the above mentioned gutter - there is barely any room for them in a Homeworks panel! (35 CCC's in a cross-section of gutter before derating - so NM in the top - drop the ground in a bar, then through a nipple to a J-bx or same to the panel - so long as you are not bundling there is no derating.)
Suggest a gutter below just for all the feeds. (1 per 4 switch legs...)
