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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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Showing 5 responses by djones51

djones51
4,947 posts
 
Since you’re out of your depth I hope you get a licensed electrician. You will need direct burial or UF wire underground. If you put in a 60 amp sub panel use 4 awg from main to sub then at least 12 awg to the outlets. 6awg is only rated for 55 amp you need at least 4 awg for a 60 amp sub panel. Talk to an electrician.
djones51
4,947 posts
 
It doesn't matter what anyone doubts what matters is passing inspection. Call an electrician.
djones51
4,947 posts
 
If it's underground it would be the THWN. W for wet. Most  #4 is stranded aluminum .
djones51
4,947 posts
 
No, voltage drop isn't a worry unless it exceeds 5% from the transformer to your outlet then it's not code. Quit obsessing over irrelevant stuff and listen to your electrician. Get him or her to test the voltage on an existing outlet and see what it is. I've had 121 volts on  a 120 volt outlet. It can vary during a 24 hour period. 
djones51
4,947 posts
 
I assume the power conditioner at the subpanel would work on all 4 lines. What are you intending to plug into the power conditioner in the system room? If you plug the e.g. Niagara 7000 into one outlet then components into the Niagra what’s the point of 4 lines? Or are you going to put a power conditioner at the end of each run  for a total of 4 ? Am I missing something?
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