Dedicated circuit


I read a lot of posts on the subject, but my question is I have 6ga feeding a subpanel . My 220 compressor and other circuits are fed from the subpanel.
Should I run my dedicated circuit off the main or would it be ok to pull from the subpanel?
If I run from main it will be close to 100ft of wire, so would be best to use 6ga.
Or, off the subpanel which would be about 40ft, then I would use 10ga from subpanel to dedicated outlet.
Any opinions?
Thanks
128x128skids

Unfortunately, the ac compressor is going to infect the whole house, it won’t be confined to the subpanel. Running a 100 foot branch circuit makes it a magnet for EMI generated throughout the house, so I would use 3-wire romex. The wire is pre-twisted and helps with rejecting common mode noise, which could be a problem at that distance.
So, I assume using 3 wire I would combine the two hots, giving me an effective gauge increase.
At this point I am only installing one outlet for my amp.


 The 3 wires would be hot (black), neutral (white) and ground. I would at least have a double outlet box, 4 sockets pig tailed.

I plan on running 2 outlet boxes to my room. One outlet box for my amp with 2 sockets on the front wall. And then a 4 socket outlet box for my components on the side wall. I don't need 4 sockets right now, but in the future I may. It is easier to put in extra now than have to add outlets later. I am going to use some PS Audio outlets I have lying around to start. So the dedicated outlets in the room will be light grey, while the rest of the outlets in the room are white.

To me 3 wire is,for example, 12/3 w/ground.
so I could run 12/3w/ground tie the hots together and end up with an effective gauge of 9
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