Dedicated Line Noise Filter?

I heard from my electrician and all is good. I copied the instructions posted by @jea48 and @almarg and sent an email. He said that the additional wiring of the new panel matches jea48's information. One exception is that he believes the 2nd grounding rod should come from the subpanel, rather than 2 rods from the main circuit box. (new code requires 2 ground rods per residence).

So, Jea and Al, thank you again for the time you spent dealing with this issue.

@cleeds ,

the project wasn't inspected by a city official before it was put into use.

Inspection is done at the time a house is being sold during the closing process; Title search, Home Inspection, and Pest Inspection are required. The buyer may use an attorney or a realtor for the closing process and must hire the certified building inspector.

As far as permits, I saw the law that you posted, and I know it applies to construction or an addition to a residence, but my neighbor and I both have had electrical and plumbing work performed without a permit from a licensed contractor.

Oh, and @jea48 , I have a 2 phase panel with 60A service (small row home and still meets code). Electrician installed a 60A Double-pole breaker in the main panel, then ran wire in a conduit to the subpanel.
It's about 5" to the side of the main.

Not that it will help, but gotta say, @jea48 is just so generous with his knowledge- he helped me with some questions I had about an isolation transformer install, and I had a big electrical contractor do the work, open a permit, etc. There is a gap in knowledge, I think, between the electrician community and audio-- and jea48 gets "it"- no code shortcuts, but getting to the issues.
I’ll watch this thread with interest. I always learn something on these electrical/code/wiring threads.
What’s scary in Texas (unlike NY) is that it is caveat emptor for buyers. When we were looking at houses here, I’d say, hmmm, I wonder what the file says, and my broker would pull it, go to the city or county as applicable. Outbuidlings that were never permitted, additions, ditto. So, when you buy, it’s on you, the buyer. You may be ok until you want some work done, and then a city official comes by and says, "sir, that outbuilding there- we have no record of it." And you are in backwards compliance land.
I lived in PA many years ago, but have zero knowledge of practices there.
Good luck with this low-- you’ll get it sorted.
bill hart

Many thanks, @whart . I agree that @jea48 has the knowledge that crosses that boundary between electrician and electronics. All that and I bet he can cook. 

Thanks Bill (whart), and lowrider57, for the kind words.

Jim