Dedicated lines — how many? Other advice?

@hilde45,
Run a 10/awg BX/MC cable solid core conductors from the breaker panel to a metal receptacle box. The metal sheathing on the BX/MC cable absorbs the (EF)) electric fields emitted by the wires and shunts it to ground. Now from panel to plug is shielded. The upside is low line noise and reduced antenna effect. Downside BX/MC cable is pricier. Run at least two dedicated 20 amp lines for audio. I have four in my audio rig. No ground loops See the links below. Hope that helps. Mike.                                                                                                                                 https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf

 https://healthybuildingscience.com/2013/01/15/residential-wiring-best/#:

Myself has a electrician audio friend install 2-20 amp circuits 
to low resistance ,and isolate I had Awg 10 wire , Pangea to HD 
Solid Copper Gold plated AC outlets they are very good ,
the lines are 4 wire ,have 2 grounds ,1 common ground , the other 
is a insulated Isolated ground , it made a tremendous difference .
I had stock awg 14 originally the noise floor is dramatically lowered 
also the 20 amp circuit breakers are Silver and were $60 each but well worth it ,he had to order them for these are only use in critical 
installs he said and I had installer a Siemens big surge suppressor 
installed at the breaker box to protect it.

@ditusa @audioman58  Thanks -- taking notes and following those links. Appreciate the actual help.

Glad to help , happy 4th to all 🇺🇸 

A seperate dedicated line for with a good line conditioner would’ve optimal Audioquest ,has the  model 12000 , 2000, or2500
and 5000 , like myself the bigger wire the better awg 10 is what I used , 20 amp breakers , and 4 wire Not Two, using a dual ground , one common ,the other a insulated isolated ground ,noticeably 
lower noise fooor and for sure and pure silver Circuit breakers or silverplated over copper .much better then stock ,and won’t oxydize like copper, and Copper gold AC outlets pangea 
not expensive $50 each have at least 3-4 outlets installed you 
will use them ,and cap the openings if not using to prevent dust
Getting inside, if you budget can handle a higher priced line
conditioner buy it ,it has better technologies. Also for equipment 
protection Siemens make a nice  surge suppression that installs at
the breaker box.  it’s less then $200 Everything counts.
2 seperate 4 wire dedicated lines better then 1 . Copper wire only 
and all your power cords should have -0 Brass which most cheapest ones have 3 x less conductivity-more resistance = noise
i build some of my own powercords ,and use Furutech  about $120 per per mid grade, VH audio is very good for assistance , email Chris he builds them too if you want quality  ,less $$ then commercial brands , triode wire audio cables are very good value- quality.