Help with non-heating leads on radiant heat code/ul listing NEC 424.97

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lavacano

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Location
Minnesota
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Master A Electrician
Hello, I encountered in the field an install that seemed non-conforming. Unfortunately, the NEC is vague and there is no identifying means on the heating equipment.

My question is this: In 2008 could you run non sheathed leads into the t-stat box for ceiling and floor radiant heat?

In my experience the answer is "no" and I've always installed conduit to cover the leads until they are covered and protecting the termination into the junction box Like this
My customer had a Cadet Tstat that melted its solder off the triac to the heat sink
Thing is rated for 4500w peak. My first thought was they may have been using too much and the thing overheated. Then I looked at the non-heating (cold) leads coming into the plastic nail on box
In these photos you can see non-heating leads without an outer sheath or equipment ground, run into the single gang box without conduit or even a gromet. Is there heating equipment that can be installed this way? The leads to the left are for the ceiling and floor and installed 2008 new construction with permits and inspections on the new construction wiring.
 
I have seen leads from ceiling heat that are listed as single conductor UF cable installed that way, but not in newer installs.
 
I have seen leads from ceiling heat that are listed as single conductor UF cable installed that way, but not in newer installs.
Do you remember the brand? The home was produced in 2008 if it was still being sold with UF single conductor which looks like it is what I have here and that was listed at the time is the larger question.
 
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