I found the Oyaide Tunami v2 power cable to sound good on my power amplifiters. It uses the high polymer polyolefin insulation discussed in the information linked a couple of posts previously for their VONDITA Xe cord. It also uses PCOCC-A wire, copper foil shielding, and a Carbon PE layer. At 5.5 mm squared, it is a bit larger than 10 awg per run so should be sufficient for just about any power amplifier, which is what I used them for.
What I don’t understand, is the polarity between their attention to detail related to the wire conductivity in the power cable but then their use of plug connector blades made from deoxidized Phosphorus Bronze, which has relatively low conductivity in the range of about 11-20 IACS. I made cords from their P-079/C-079 plugs/IECs and Furutech FP-Alpha-3 cable to power my monoblocks and the sound was good but not as dynamic and rich as I hear from my 7awg WE wire cords that use Furutech FI-11 plugs, and also not as good on my amps as the Oyaide Tunami v2 cords that I now use on my preamp. The 7awg WE cords are very similar to the well-regarded 7-Plus American Series from TWL.