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Is tray cable in cable tray considered exposed?

Question asked by ral@livelinesafety.com on Jun 11, 2019
Latest reply on Jun 12, 2019 by ral@livelinesafety.com
DEFINITION: Exposed - (as applied to energized electrical conductors or circuit parts) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to electrical conductors or circuit parts that are not suitably guarded, isolated, or insulated.
How does this apply to cable in cable tray if technically these, according to the definition, are "energized electrical conductors"? 
Is jacket considered suitably insulated?
Is THHN cable considered exposed? Or is the insulation suitably insulated?
I know as an electrical apprentice I remembered being told to crawl onto the tray to straighten out and tie down the cable and I freaked out. I saw others start to do it, so I did it. It still scares me 

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