[faterikcartman]

I want to feed a 100 Amp subpanel from a 100 Amp fuse in my 200 Amp main service panel. Just to let you know, I am having a licensed electrician make the connections but to save money I am doing all the grunt work (which I totally regret but now I'm committed and determined).

My question pertains solely to feeding the 100 Amp sub and the correct, per 2002 NEC, requirements.

Ideally, I would like to feed it (through a single stud from the main right next to it in my attached garage) with 2/3 copper NM-B (3 conductor plus ground, 2 AWG Romex) but from consulting various charts am concerned that that would not be big enough due to necessary derating because it is Romex.

My alternatives (as I see them now) are using 1/0 SER but that would be aluminum which I rather not use, or running 1 AWG THHN in 1 1/2" conduit but since I'm not cutting a 1 1/2" hole in my 2x4 stud that would mean a funky short run of conduit exposed in my garage which I do not want.

Is 2/3 Romex up to 2002 code or do I need to go larger (SER since there is no Romex larger than 2/3)?

Thanks in advance.