Hey electrical froods:
I have some receptacles and a light to wire. I plan to:
Feed the switch box with 12/2 NM
Run 12/3 from the switch box to the light, with both hots connected to the switch box feed hot, the red switched, the black unswitched.
Connect the light to the red and the neutral.
Run 12/2 to the receptacles, connected to the black and neutral of the 12/3 in the switch box, for unswitched power.
Since all my circuit conductors are always in one cable, and there is no way to overload any conductor of the 12/3 without overloading the 12/2 that feeds it, and I'm not paralleling because the red and black are connected only at one end, would this not comply with code? I can't find anything against it, and it's neater than running two separate 12/2 cables. It's basically what you do with a ceiling fan, but with the circuit continuing past the end of the 12/3.