Fremer Installed a new electrical service replacing the old, in bad shape, outdated one. That in itself would make a big difference. Just look at the old meter socket in the video. The old aluminum wiring connections were corroded. More than likely the aluminum wire connections were not tight either. Poor corroded connections equals excessive harmonic distortion. Excessive harmonic distortion equals noise on the AC mains wiring.

Add to that all the old utility power wiring to new service wiring terminations at the overhead weatherhead were replaced. That can make a big difference...

I did take note of the earth grounding connections methods used in the video. That’s probably the first time I have ever seen Cadweld (Exothermic Welding) terminations used for the connections of the grounding electrode conductor to the earth driven grounding electrode, ground rod(s). That ain’t cheap!

FWIW the main purpose of the electrical service to earth connection is for lightning protection. It does nothing for the sound of an audio system.

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Fremer did the right thing for his situation.

You likely only need some dedicated 20amp lines added.

I have the dedicated lines and just bought a Balanced Isolation Transformer

to do some light cleaning. Then I hope to be done.

If your grounding sucks, as they all do in desert areas,

you can look into improving that. Keep us posted please.

Watching the Fremer video now. Perfect example of what I have been saying over and over again to people quoting code: Code is nothing to do with sound quality. Code is for safety. You can do it perfectly to code and still have crap. 

(Where by the way is the fuzzball who complains when Fremer videos are posted? Crickets. MDS much?)

Fremer’s new electrical service was wired to the current code for the AHJ, (Authority Having Jurisdiction), in his area. The wiring and wiring methods used can exceed the AHJ requirements/standards as long as the wiring used and wiring methods used meet the minimum AHJ standards.

AS I have said many times... Code is bare minimum...

With that said, bare minimum Still has to be met...

Example, NO ISOLATED DEDICATED GROUND ROD(s) All grounds rods shall connect to the main grounding system of the electrical service.

Quote:

National Electrical Code 90.1 Purpose:

(A) Practical Safeguarding. The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the use of electricity. This Code is not intended as a design specification or an instruction manual for untrained persons.

(B) Adequacy. This Code contains provisions that are considered necessary for safety. Compliance therewith and proper maintenance result in an installation that is essentially free from hazard but not necessarily efficient, convenient, or adequate for good service or future expansion of electrical use.

Informational Note: Hazards often occur because of overloading of wiring systems by methods or usage not in conformity with this Code. This occurs because initial wiring did not provide for increases in the use of electricity. An initial adequate installation and reasonable provisions for system changes provide for future increases in the use of electricity.

Harumpf, harumpf, goes the relfex.