n you run thhn wire in a cable tray
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School question. The answer can be found in your electrical code book.
The conductors of any three phase circuit must be run in the same conduit. If the circuit requires a neutral, it must also run with the conductors in the same conduit. (If they were to be run in more than one conduit or raceway, the circuit would not operate properly.)
Need to know what size service is going to be installed at the end of the run.
No, the bare copper grounding conductor can not be in a conduit with other conductors. It can be in conduit by itself to provide mechanical protection for the wire.
An underground electrical pull box provides another access point in long runs of cable to make it easier to pull the conductors from one end of the run to the other. The crew can only slap so much silicone lube on the conductors and the the conductors can only have a limited amount of force applied on them to pull them through the conduit. If a long run is broken up somewhere in the middle, the crew can pull to that point where the pull box is located, and then "start a new pull" from the box to the end of the run. It's more work, but it protects the conductors and the job ends up "meeting code" and passing inspection.