Sources for information and/or advice on dedicated AC lines desired

Hello bdp. We did a renovation of an already finished basement that allowed installation of dedicated 20 amp lines for a music listening area. I suspect what we did is sort of a basic/minimum.  Were we building anew "from the studs", as it were, there are a couple of additional things we’d have done.  Basically all we did was run 3 separate lines w/standard Romex cable from an existing sub panel. I had 3 duplex Cabledyne (cyro’d Hubbell) outlets installed at the end of each run.  That doesn't represent a personal position on the merits of cryo treatment, simply that the Cabledyne outlets were well reviewed and affordable and cryo’ing is what Cabledyne does to them.

Ideally, I’d have liked to install a separate panel connected directly to the line from the street and supporting only the 3 new lines. Separate grounding for it as necessary. Not in the budget. Our sub panel does have a few other circuits on it but, fortunately, not the main house power draws. My thought is if you contact a local A/V store (or audio store) you can get a recommendation for an electrician they’ve used to do installations. Pretty sure it is not rocket science and a competent, licensed electrician will be able to give you good advice.

Good luck.

I've had good experiences with a 5kva balanced power transformer.  Next move I plan to run a 240V line to the listening room, where a 10kva or larger transformer can be plugged into the wall and output several isolated 120V threads to the audio system.  That meets electrical code.  (It's against code to put the transformer at the basement panel and run the transformer's 120V outputs through the walls to 120V outlets.) 

Not sure if this is against forum rules or not, but there was a very informative thread on a different forum on this topic
http://forums.stevehoffman.tv/threads/dedicated-lines-1-use-isolated-grounds-or-not-2-subpanel-wirin...

Also, I've heard good things about Cardas AC wires designed for use inside the walls.  Possibly worth a look.

I went through this back in around 2006 or 7 and got some great technical/code sorts of insights from a few contributors far more knowledgeable than me. I gave all of it to my electrician to review, and it helped.
Here’s what I know:
I wouldn’t use existing wiring, would use 20 amp lines with correspondingly heavy gauge wire, would have an electrical contractor that gets the inspector to permit/ approve it (and if possible, somebody who has had experience wiring stuff for studios or halls).
Unless you have the ability to get a completely separate service for your system, you are, as far as I know, going to be sharing ground with the household system, which has the potential for noise. There are tricks about which leg, etc. but the idea of a big-assed isolation transformer is a good one.
Do more outlets and lines than you think you need- way cheaper in the long run than having to break walls and have a new mess on your hands (with all your delicate gear, records, etc. whatever already in place).
I have an Equi=Tech big box sitting in storage- I thought I’d be relocated by now; there are some specialty panels made by audiophile companies, but I suspect the real hands-on folks may say Square D brand or equivalent is fine (that’s what’s currently being used in my NY house, 60 amp subpanel, plus a 240 volt line for one isolation/step down plus an additional isolation transformer for my tone arm air compressor).
I’d look at electric as part of an overall plan for the room- are you doing separate air conditioning system- Mike L followed certain practices used for studios to keep air rush quiet; also, I’d think about whatever current state of the art is in filtration to minimize dust but that’s a peeve of mine;
lay-out for signal cable routing;
lighting and how that relates to electrical- lights can be noisy;
I actually got rid of my AC conditioning boxes once I put in the dedicated lines, I thought the system sounded better without conditioning;
I’m sure there are other things I can’t thing of now, but happy to talk, I’ve been sketching out my new "room" for several years, in the process of waiting to relocate. My plan is still a separate structure and build-out from whatever house we buy or build and its electrical system, i.e. separate service to the "studio" which can also be a zoning/code issue;
Oh, structural- springy floors suck though you can deal w/ that;
noise suppression- I never thought about sound proofing, but did it for my compressor room, which is adjacent to the listening room, used mass loaded vinyl. That stuff is crazy heavy and there’s some good stuff about how to best use it if you are open to the studs.
I didn't do built in treatment in my listening room, but aftermarket bass traps, diffusion and some absorption. Mike L. probably has one of the more over the top rooms in the States and I know he's refined what he originally had done after living with it for some years, so he'd be good to talk to and is a nice fellow. 

And a comfy chair. Like the Spanish Inquisition. :)