Spinaker01... not necessarily is the silver conductor the concern, but finding a heavy enough gauge that is adequate to be 12 or 10 AWG in silver to begin with. The concern and I was half joking about burning down the house is the insulation rated for higher heat that will stay flexible and not melt and cause a fire. Not sure most audiophile low voltage cables have proper insulation for a power cable or a distribution box. I’d suggest buy Cryo 10 AWG romex from VH Audio and cut the outer sheath off. This will be one solid core conductor and not a bunch of cables twisted together meaning a better contact and a lot easier to work with. I’d put my money in the receptacles such as some Hubbell Cryo Porter Ports or one can spend a lot more but for a distribution box I think these will be more than sufficient... again I’m assuming the OP is building something from scratch. Lastly don’t wire with a fix power cable but use an IEC inlet. Good luck.
http://www.porterhouseaudio.com/Porter-ports.htm
https://www.vhaudio.com/wire.html
https://www.vhaudio.com/images/romex.jpg
https://www.vhaudio.com/images/groundwirebulk.jpg
https://www.vhaudio.com/images/furutech-fi-06-g.jpg
http://www.porterhouseaudio.com/Porter-ports.htm
https://www.vhaudio.com/wire.html
https://www.vhaudio.com/images/romex.jpg
https://www.vhaudio.com/images/groundwirebulk.jpg
https://www.vhaudio.com/images/furutech-fi-06-g.jpg