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Dedicated 20a lines, 125 feet distance, which gauge wire to run?

Want to set up 4x dedicated 20-amp lines for my hifi system. The distance from the outlets to the breaker box is about 125 feet. What wires should I use? 10, 8, or 6 gauge? And should they be solid or stranded? If you could be as specific as possible that would be appreciated (brands, links, etc), as I am out of my depth here. The wire will need to run underground for a good portion, and then into craw space, if that makes any difference.
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millercarbon
12,531 posts
 
I will take a pass. If you really want to know, it has all been answered on my system page,  https://systems.audiogon.com/systems/8367    and in even greater detail in my posts. Search around it is all there.
sns
3,209 posts
 
I use 10awg on 75' lines. The problem with anything bigger is you'll have issues with fitting onto vast majority of AC receptacles. You'd probably have to use sub panel for the larger wire, then run 10awg from there.
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battbot OP
20 posts
 
It’s no problem for me to use a junction box for say, 8awg, then switch to 10awg from there, as there is crawl space right underneath where the dedicated 20a outlets are going. I am going to use floor outlets. 
invalid
1,187 posts
 
I would put a sub panel in and then run your 4 dedicated outlets from the sub panel.
gdnrbob
4,444 posts
 
@OP,
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