What wire to use instead of Romex

@roccity said:

Great idea to use a single pole tandem breaker. Placing it in the top panel also saves me a couple of feet of run.

I would also recommend moving the 1 pole 15 amp breaker over to the space on the left next to the 2 pole 100 amp breaker, that feeds the sub-panel in the condo. Install the 20 20 tandem breaker in the right hand space. 

Reason? It moves the Tandem breaker at least one space over away from the 2 pole 100 amp feeder breaker for condo sub-panel. Therein from the Electromagnetic fields surrounding the breaker caused by the load current running through it. The greater the load current the stronger the electromagnetic fields around it. 

(FYI, speaking of the single pole 15 amp circuit breaker. I don’t think that’s a Square D Homeline breaker. The lug the branch circuit wire terminates in does not look right. When you pick up the Homeline 20 20 Tandem breaker,  pick up a single pole 15 amp Homeline breaker.  

Homeline 15 Amp Single-Pole Circuit Breaker(HOM115CP)

One more thing. Have the electrician install two wall  outlet boxes. One for each dedicated branch circuit.  Do not install both branch circuits in a common 2 gang box...

What type of branch circuit wiring have you settled on having installed for the two dedicated branch circuits?

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Apologies for the long delay in updating. It's taken me until now to peel myself away from my system long enough to make this post!  I had two Audioquest NRG Edison 20 outlets installed just over a month ago, each with its own 10AWG solid core copper MC cable connecting it to a tandem single pole 20amp breaker in my home’s main panel in the garage. Each run was about 22 feet. The electrician did a very clean job and was very reasonable.

@jea48  I realized afterwards that I failed to ask the electrician to move the 15amp breaker one space to the left. I’ll do that myself one of these days. I did replace it with a Homeline breaker though.

Immediately after the electrician left, I plugged in (power amp into one outlet and Audioquest Niagara 1200 power conditioner hosting streamer, DAC and preamp into the other), turned on and gave a listen. I couldn’t really detect any improvement, but I continued to listen for a couple of hours with no change.

The next day, when I turned everything on and began to listen, the improvement I heard was immediate and dramatic! EVERYTHING is better. Cleaner overall sound, stronger bass, crisper highs, better spatial effects, improved instrument separation, bigger soundstage… everything!

This is by far the best bang for the buck that I’ve gotten from any upgrade to my system. It sounded more like a $10k+ jump in DAC quality rather than the sub $850 total that the project came to. If you’ve been on the fence about doing this, I cannot recommended it more!

Not sure why this pic was distorted in the post above. Here's a clean view.

@roccity Awesome! I am glad you are hearing the benefits of this much overlooked upgrade. Your experience mirrors mine. 

Congratulations! Glad to hear. I remember my first direct line. Just one more of those, how could that matter?... Wow,.. it sure does!