jake14mw wrote:What size PVC conduit for the 6-3 wire?
PVC conduit is only required if the NM cable is exposed to damage or for aesthetics. If the PVC is just a sleeve, then any size it will fit in will work. You'll still need to clamp the cable to the destination enclosure.
If the PVC conduit is complete from box to box, you'd need to use at least 1" PVC. But you'd be better off pulling individual wires.