Using 10-2 vs. 12-2 for wiring
You need to verify your box fill #10 wire uses a 2.5 multiplier. You only have to count 1 ground wire, add up all the other wires in the box and multiply by 2.5 then add 5 for the device. If using boxes with clamps another 2.5 added to to the above will provide the minimum listed box size. The size in cubic inches required by code that is stamped on the box. Be aware that measuring the box and multiplying the length, width and depth gives a larger number than the listed size in table 314.16.A.