I am wiring my carport and want to run the already buried 12/2 UG wire in conduit to make the transition from the ground to the carport post. I have been told that I should not run the shield wire in the conduit.

Why not and what are some options?

What are the recommended limits.

You are not running it in conduit. You are merely using the conduit as a sleeve for protection.

UF cable is not expressly prohibited in conduit. Also, UF cable is not "shielded". It is a sheathed cable.