Sorry, but I strongly disagree with the use of steel clad cables.You don't want magnetic materials anywhere near a conductor! I used a hand twisted pair of solid copper (Simple, I stripped the insulation from 10g Romex) and ran an insulated ground wire seperated by about 2-3" from the twisted pair. Note, I doubt this meets strict code ANYWHERE. If you want to shield the twisted pair more than it is naturally, run it in copper pipe.
What wire to use instead of Romex
I want to install a dedicated 20amp outlet (likely an AQ NRG). The run from the main panel in the garage to my living room above is relatively short - maybe 25 or 30 feet. Because of HOA rules/regs, I cannot use Romex. Wires in the garage must be inside conduit. I will run 10AWG, but I'm unsure what other specs I should implement. Should I use solid core or stranded? Should it be copper? Is BX the way to go? I've read where using stranded silver or silver tungsten is best, but I'd be concerned about the silver oxidizing/tarnishing over time, especially at the junction points where the wire has no insulation. Is it important to twist the three (including ground) wires or will they perform just as well if run side-by-side?