What type of wire for dedicated 20A AC lines?

There is more to it than just adding a 10 awg wire.  I design electrical infrastructure to support audiophiles homes as well as manufacture premium panelboards.  I have a pretty dense 6 page specification on how to assemble it all.

FWIW, if your going through the trouble of adding a line, add 2 to 4.  Its not much more money and you will hear the difference. 

@kingrex

I’ve read different opinions on running all gear in system through single 20A line versus multiple. I don’t know enough to have an opinion myself yet on this.

If someone were to install three 20A lines for a single 2ch system, let’s say, how should they determine the components to be driven by each line? Let’s say system has 2 monoblock amps, a preamp, a digital system (e.g., dac, streamer/server, sacd player, maybe external clock), an analog system (TT, phono pre). What goes to each of the three lines? or two lines?

FWIW, if your going through the trouble of adding a line, add 2 to 4. Its not much more money and you will hear the difference.

I agree! I installed four dedicated lines one for each mono block amp, one for digital and one for analog.

Mike

So here's a beginner's question.

If you're putting in a dedicated 20amp line, or even 2 or 4 of them, and if there are no free spaces on the main breaker box panel that you currently have, do you also end up putting in a new larger panel?  Does a sub-panel solve that?  And what are the other upsides/downsides of a sub-panel?