Hey. I am installing four 4x4 posts around my pool. I will bury 12/2 UF-B wire and run pvc conduit up the post “to” a floodlight and will need to run a wire “from” the floodlight back underground to go to the next post/light. My question is can I run both wires (“to” and “from”) in the same conduit? I assume I shouldn’t if using NM wire due to heat generated by opposite flows of current (if that’s even a thing) but would it be ok with UF-B or should I run two separate conduits for “to/from” or “up/down” wires. Not worried about code/inspector but I am worried about safety, so I always try to follow code. Thanks for any help.