What is the best copper for mains cables ?


With Acrolink Oyaide, Furutech, Nanotec, Neotec all claiming the best purity of copper for mains cable, which company is actually correct ?
If i have not mentioned any other company claiming their copper is best to provide electricity to our equipment please bring some more companies to the discussion.
Is there a best copper ?
Or are they all good just different ?
I am not talking cable geometry, filtering or insulation, just the best quality copper for mains cable duty.
Even if you do not buy into the marketing of these mentioned companies, please offer your opinion, Thank you.
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Showing 1 response by tecknik

Acoustic Revive has solid copper ac cable labeled EE 2.6 which I use as a main cable powering my digital components from breaker to inlet. I believe there are other offerings.