Considering the end use is to help facilitate a high quality improvement in the sound of your system, and considering the value of your time it will take for DIY, why even mess with a standard copper cable when you can buy this very reasonably priced alternative;
Power Plus Reference Series Power Cable - Three 12 awg conductors, price per foot $6.08 pcX USD Priceor, if you want even higher quality, here are two using PCOCC copper;
DH Labs is proud to introduce the Power Plus Reference Series Power Cord. The Power Plus is constructed with the finest High Purity Copper in the world. The design of this cable combines very low series resistance, inductance, and DH Labs noise canceling geometries for immunity to outside noise.
The Power Plus features two twelve gauge conductors and a twelve gauge ground. The very low resistance of the 12 gauge conductors, combined with the cables low inductance, allows for unrestricted dynamic current delivery, while keeping noise out of your system. The cables design and custom insulation also reduces coloration and improves overall transparency.
NEOTECH - 3 Conductors 11 awg with shield AC Power Cable UP-OCC Copper NEP-3002, price per foot $19.95 pcX USD Priceand
FURUTECH FP-3TS20 Power cable 3x14 AWG PCOCC 2 Type Stranding, price per meter-$78.76 pcX USD PriceBTW - they are currently having a 15 percent off sale.