If you use and old work box you will not have to do any repair work. check them out at any hardware store,
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I had the same issue that you have. I ran a PC straight from the fuse box in the basement, into a cryo'd outlet behind the gear. The length was approximately 45 feet. I used cryo'd romex from Chris VenHeus here: http://venhaus1.com/VH_Audio_Test.html
I bought 50' of techflex expandable sleeving from Parts Express.
It looks fine and works great...it even sounds good!
About a year ago I did a similar thing but instead of terminating into a receptacle, I terminated with a 20a IEC and plugged straight into the back of the power amp from the circuit board. You can do either, both work well.