Looking at the construction of high end power cords… amp oriented tend to carry 10 gauge or probably more in some cases. Digital and low current have an emphasis on noise reduction using smaller gauge with elaborate layerings. But each company like the major suppliers of Transparent, WireWorld, Audio Quest, and Cardas each have their own approach. Cardas for instance seems to favore heavier gauge for all power cords. Shunyata varies the gauge between applications.
What size power cable?
How “big” does a power cable need to be for upstream components? I get that amps can benefit from a large cable to carry plenty of current, e.g. 8-11 awg. Although my preamp and phono preamp have robust power supplies, they can’t possibly benefit from such capacity, can they? Extreme overkill is the norm in hi end, but is there any benefit to more than 12 or 14 awg on a preamp or phono preamp? Much less digital components.