Romex to your amp?

Electronics and power cords do not need to be UL listed. Certification is an optional process that costs $5,000-15,000 of dollars per model and is only good for 5 years. The only reason large manufacturers do this is because many retailers and contracts specify certified products only. Clearly very few (if any) boutique power cables and audio components are certified.
There is nothing wrong or illegal about solid core power cables. They were sold by a number of manufacturers in the past and Anticables still only sells solid core power cables. You just need to treat them a little more gently and don’t beat and twist of them like that orange extension cord you have in your garage. Properly constructed with decent plugs solid core can sound great. Easily better than any stock power cord and they can also compete well with the big bucks cords. The best part is you can put one together for <$50 (a little more if you want to sheath it and make it look professional).

But don’t take my word for it. Check out this PS Audio blog.
https://www.psaudio.com/pauls-posts/my-first-cable/

https://www.psaudio.com/pauls-posts/cable-geometries/

The Authority having Jurisdiction, ultimately the local government often passes laws/bylaws that accept in full the NEC. They have to to have legal authority to enforce compliance. Lack of compliance is a civil violation not criminal but you are still breaking the law. Negligence can become criminal of course.


UL ensures a level of safety compliance and UL standards also have relevance to NEC. That power cord may not need to comply to UL, but it would likely need to comply with NEC (and your insurance policy). Outside the US, many countries require only conforming products to local standards.  A UL is not good for "5 years". It is good till a new standard is released and while you maintain your listing.


I am curious about this internal distortion and dynamic loss of stranded conductors at audio frequencies science seems to have missed.

@buckhorn_cortez. I think you should re-read my prior post, you are adding words/points in there that I did not state.
Nonetheless, we are in agreement on the basics.

Notice that Nordost`s top pc`s are solid core, not single core though but 6-7 conductors. Wery close to the famous pc Electrocompaniet came up with in the 80`s wich lead me to try out the nowegian 12awg Romex-equivalent. 

I am an Electrian and for each of my two systems I ran two dedicated 120V 20 amp isolated ground lines. Providing me with 80% of 40amps at each location. I use hospital grade isolated ground receptacles. I make my power cords with 12-3 SJ cord to minimal lenth using hubble connectors and they are all plugged into a power conditioner that in my opinion makes the most difference, for those that do not know isolated ground means that the ground is connected back at the panel and nowhere in between. This reduces interference from RF noise. The isolated ground and the power conditioner is all you need, IMHO, though others may differ. By the way I dont know of any Electrician that will run a dedicated line from your equipment to your panel for $200.