What wire to use instead of Romex

@roccity said:

Yes. It’s a short, straight run from the outlet down to the garage - just as it appears in the illustration I created above.

Best and cheapest way is to have the electrician install 10-2 solid copper MC cable.

You will save on labor and material. Labor is your biggest cost.

He may even be able to run the MC cable up inside the wall and recess the electrical outlet box. Just a suggestion for the electrician use a deep i gang cut-in switch box. He will appreciated the added space for make up of the duplex outlet to the #10 solid wire.

FYI if you would like 4 receptacle outlets have him install a 2 gang deep cut-in switch box for two duplex outlets.

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. 

If you want to shield the twisted pair more than it is naturally, run it in copper pipe.

Please be kind to the demo crew that will take your house down in 10 or 25 years and don't do this. There's a reason specific, easily identifiable conduits exist for each purpose: so that future workers will know at a glance what's in it. Running power conductors inside plumbing tubing is complete idiocy.

A Master Electrician can answer all of your questions and source materials that mere mortals will struggle to find.