UPgradeing dedicated line components

I seek input on value of:
1) Upgrading the breakers in the square D box.
2) Replacing the romex for 10ga stranded cable for all lines.
3) Upgrading the outlets to PS audio or something of ~equal value.

#1) There is no upgrading the breakers. Hopefully you have a Square D QO panel and not the Homeline series.
QO has copper plated bus, Homeline has aluminum bus.

All three dedicated branch circuits should be fed from the same Line, leg, of the panel.

#2) #12 wire is plenty big for the preamp and digital for a 20' run. You will not hear any difference changing them out to #10. (I would not use stranded wire)

#3) I can't help you there. I will tell you all hospital grade recepts are not created equal. I am using the Hubbell 8300H hospital grade non plated contacts with a non plated brass backstrap. The recepts are cryoed.

Stay away from recepts that use nickel plating on the contacts and the mounting backstrap. Also you do not want a recept that has a ferrous steel backstrap.

Thanks Jea. I will look into the Hubbells.

You might want to check out the Porter Port.

Consider adding Environmental Potentials Ep-2050 and ground filter Ep-2750 at the panel.Plenty of info in the archives.

I have a similar system,in that my two power amps are on two separate dedicated lines, and so is the cd player on a third dedicated line.
The phono stage, TT,and Lightspeed attenuator(for the cd/sacd player)are plugged into a Hydra8 power conditioner, also on a foutrh separate, but not dedicated line.
Dedicated lines are great, but I wanted an even more direct route from the panel to my gear.
So I did away with power cords and outlets,and instead of those what I have done is to terminate each of the 3 dedicated lines with a Furutech F1 48(R) plug.So that's two mono power amps and one SACD being powered up with no breaks from the panel,except for the IEC's.
This I think is worth stating.

The money saved on after market power cords and outlets(I now have spare Shunyata Anncondas and my Furutech GTX D is on the 4th non dedicated line)could better be spent on upgrading the IEC at the end of your dedicated lines and plug them into your gear.
I find this has given me more of all the things we are always searching for.
I always believed in the less is more type of audio and this set up is proof enough for me.
A few years ago I rained down all manner of criticism towards those I labelled "wall pluggers".
I still feel upgraded power cords, conditioners,and wall outlets are still needed when dedicated lines aren't an option.
But becoming a "panel plugger" is now where I feel most comfortable.