The conductors in PLTC cable aren't THHN - or any other 600V rated conductor. They are 300V, 105C.
That said, the NEC isn't a "design specification" and there is an expectation that a bit of common sense would apply. If the PLTC cables are otherwise acceptable in both Articles 500 and 725, then it is a reasonable expectation that they can be terminated in enclosures that are also acceptable in Article 500 with enough jacket removed to terminate the conductors.
"Bob"
Robert B. Alexander, P.E.
Answers based on 2017 NEC unless otherwise noted.
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