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Re: Dedicated line using romex 12/3 with red and black for hot. Has anyone else used this?

If you have a used a double pole breaker you know have 240V feeding your system DANGER! is the best way to describe.
Only one line is needed unless you max load exceeds 16A of total continuous current on a 20A line.

If current demands req a second line use a single pole tandem breaker.
Using a separate line for digital stuff creates MORE noise via. grounding problems.
As for THHN you will have to run EMT, RIGIG, or NM, conduit a waste of time. I suggest refocus on what come AFTER the dedicated line i.e.; JR filter, Balanced Power and/or ISO trafo. etc.. These filters will provide what you are looking for, which can season to taste and use gool ol' ROMEX

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