Looking at UL 60065, 7.1.5, table 3, metallic knobs can rise 30 degrees C.
Non-metallic knobs can rise 50 degrees C. Metal enclosures can rise 40
degrees C. Non-metallic enclosures can rise 60 degrees C.

UL 60065's scope is Audio, Video and Similar Electronic Apparatus. I
suspect other standards would have similar requirements.

Harold



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