What's involved in dedicated lines

I just unscrewed the fuse (20 amp) to see what else was on the line in addition to my stereo/ht. This line controls my kitchen fluorescent light, one outlet used by a cordless phone, and two other overhead lights. Are there degrees as to how negative line sharing is, or is it the more other items on the line the worse it is? or are some items like a refigerator worse to share the line with? Some of my otgher fuses are 15 amp, it's good that my stereo is on a 20 amp line?

Gjkphd, I am so not an expert on this, it's ridiculous. But, here's my 2 cents:

First of all, if you have an old fusebox, & you plan to keep the house for awhile, it's probably worth it to upgrade to at least a modern 100 amp main panel w/circuit breakers, regardless of your audio issues. (Like Viridian said). Spending a lot of $$ on dedicated lines when you have an old fusebox seems to me like worrying about which Pirellis to buy for your Model T. But that's more of a homeowner's perspective than an audiophile's.

And yes, probably some things like a refigerator, or fluorescent lights, are worse to share the line with. (Hello!) But maybe tell us more about your system, your budget, etc.......

In response to your post Steveaudio, I've been in this home 12 years and am not going anywhere in near future so I will look into the changout from fuses to breakers, how will that be better audiophile-wise?
system incl cary preamp, pass x-250 amp, kora hermes dac, modified sony cd/dvd transport, tuner, acurus pre/processor, nad amp for kitchen and patio speakers, b&K 3 channel amp for surround, and tv and vcr and digital cable box. I have a tara labs line conditioner for sources and all equp have upgraded power cords , b&K and pass amps go straight into the fim outlets,

Gjkphd, some time ago several folks posted about comparing circuit breakers to the old style screw-in fuses. Their conclusion was that the old-style screw-in fuses sounded better, and that the even older glass fuses sounded better than the "newer" ceramic ones. I've never experimented with it, so I can't comment from personal experience.

That said, a major improvement from what you have today would be accomplished simply from pulling, cleaning and then reconnecting the applicable electrical cables, including the primary feeds, in your electrical panel (definitely professional ELECTRICIAN time). If you move forward with the dedicated lines, you'll get this automatically from the new lines. But while you have the electrician in the box, pull, clean and reconnect the mains lines and ground line as well. If you additonally apply some Walker Audio SST contact enhancer as you re-make the connections, you'll get an added improvement.

Gjkphd, like I said, my suggestion to change from a fusebox to breakers is more of a homeowner's perspective than an audiophile's. I honestly don't know how or if it would affect the audio quality. But I've been looking at a lot of houses to buy recently, & an old fusebox is definitely not desirable. Even 150 year old houses in nice condition will usually have updated electrical (circuit breakers). All I'm saying is, if you're going to spend $$ to get dedicated lines, when you're getting estimates, get a quote on this; it might not be more than a few hundred $$, & would be a nice update to your house, help the resale value, etc.

BTW, the fact that you have some 20 amp fuses doesn't necessarily mean they are on a "20 amp line". People use 20 amp fuses all the time (when 15 amp fuses are called for) because the 15 amp fuses blow when they plug in an A/C or something.

I realize this may be a bit O/T for your audio issues; just my 2 cents worth.