How to guarantee to lower noise- ground loops in your system

I have been through many problem area where noise in the  audio chain was a problem.
my friend Who is a Electrician solved the problem . All too many times people add a dedicated 20 amp circuit 12awg is standard 11-10awg even better lower resistance , also most important 
you need a Isolated dedicated ground, this is totally insulated right back to the earth ground in the 
breaker box this will dramatically lower your noise floor and remove ground loop problems .many people just put a dedicated line and think 
that’s it ,not so, if you are going to go through the trouble, then  for maybe $100 more the isolated dedicated ground  to the dedicated circuit is a must. I can tell you without question .
my Audio has a noticably quieter background .in songs i now hear low level musical artifacts like reverb off a guitar fading cymbals and clearer seperation of instruments .well worth the effort .Hopefully 
this will help others .this is a essential system upgrade .
If all circuits are to Code, AND there is a proper low resistance earth ground, you won’t have any mains circuit ground loops. 

This is all an absolute waste of time and money. 
If all circuits are to Code, AND there is a proper low resistance earth ground, you won’t have any mains circuit ground loops.

If "proper low resistance earth ground" means the earth ground from the components, then that is correct.
If just one component doesn't have a proper grounding scheme and is using unbalanced ICs, there is a probability of a ground-loop.

What many people don’t realize no matter how good your equipment design is if you are feeding ground off
the same circuits you can pickup noise
@audioman58  This actually isn't universally true. Its only true if the audio equipment puts current through the ground connection, which if its properly designed, it won't.

What sends up a red flag for me is, if doing this made a difference, then we know that some equipment in the system has a problem. When we then know that the designer blew it when he/she designed the grounding scheme, how many other aspects of the internal grounding are correct? The thing about ground loops is even if you don't hear them as a buzz, they still affect the sound via intermodulation.
HelloTo All , I never  stated this was a cure electrician has wired several Music studios ,and wires highly sensitive testing equipment he stated 
as a 30 year Master Electrician the 4wire Dual,ground ,where  one is common 
bare wire the other dedicated insulated 
ground this is the best way to get the
lowest noise signal. It works exceptionally well for myself and several friends who have done this.
nothing more to say I was just sharing 
what is installed in my Audio systems.
Several years ago I drove a new ground rod directly outside of my dedicated listening room, and connected an 8 gauge ground wire to an isolated 20 amp receptacle. That receptacle feeds my Pure Power 2000 a/c regenerator and also my APC S20 power conditioner. That isolated ground was the only ground wire for my stereo system, and did not connect to my electrical panel. It worked fine but I did not notice any great improvement in my sound. Maybe I might have noticed a greater improvement if I had also ran the neutral wire to the new ground rod, or maybe not.

About a year later I was talking to one of my new club members who had moved to Florida from north of Dallas Texas, and is an electrician. Since he is an electrician I told him what I had done for an isolated ground in my system. This is freaky, but he told me that he had done the exact same thing in Texas. His ground rod was struck by lightning, and traveled through the ground wire into his isolated ground receptacle, and also caught his drapes on fire.

It had previously been in the back of my mind that the same thing could happen to me, because we get a tremendous amount of lightning where I live. My dedicated isolated ground receptacle is also behind my drapes, and I do not want to remove the drapes because they run the entire length of that wall. So I removed the eight gauge ground wire and reconnected the ground wire that goes to my electrical panel.

In the future I may try installing a plastic box on the exterior wall by the new ground rod and leaving enough wire inside the box to reconnect to the ground rod for brief usage at times when I’m sure there will not be lightning strikes. This is entirely illegal and shows that there are solid reasons for electrical codes, and most of all to always pull an electrical permit for new electrical work. If you do not want your house to burn down do not try the above.