Greetings & Happy New Year to all!I'd like to throw my 2 cents in here.First off I AM a licensed,01 (Commercial/Residential) JOURNEYMAN Electrician in the states of Washington & Nevada with 10 years experience & have done custom installations of home theater systems valued to $50,000.00.With the established notion that I know a little about this subject I would like to make the folowing observations.1:THHN is NOT recommended for your appication.THHN is a single conductor stranded wire & is almost exclusively used when pullng wires through emt or pvc pipe,NOT for running dedicated circuits into residential walls.2:For your application you want to use ROMEX wire,size 12 guage for a single 20amp circuit,size 10 guage for a 30 amp cuircut & if you are going to run a dedicated curcuit for each recep.then I do NOT recommend a 12/3 or 10/3 wire which shares the nuetral between the 2 cuircuts as the nuetral wire is were you are most likely to pick up line noise & this defeats the purpose of a dedicated curcuit for each recep.Either run 1ea. 12/2 ROMEX for each recep.or jumper the receps together on 1ea.30amp 10/2 circuit.One last thing.UNLESS you are very mechanically inclined & are sure that you can do this project correctly & SAFELY, HIRE A CERTIFIED JOURNEYMAN ELECTRICIAN to perform the labor.Retrofitting circuits into existing structures is NOT a slam bang deal & requires experience & the knowlege of how not only to avoid existing circuits in the wall but also to deal with any unexpected obstacles that may be incured in the walls such as fire breaks.I hope this helps.
