Not in my neck of the woods...
They come out and walk the trench with tape measure in hand measuring depth of burial. Including a friggin' post lamp at the leadwalk!
One county I work in allows the master electrician to submit a ditch cert. I wish more did this.
One option if you want to bury the ditch but an inspection is required, take a piece of spare conduit, drill a large diameter hole saw thru it sideways (bit same as conduit OD), creating two birds mouthed pieces. Place birds mouth end on the OD of the buried conduit (tee like), and then tape this piece with painters tape to the buried conduit and keep it vertical while backfilling. This creates an inspection port that can be checked by the inspector via a tape at a later time. I had to do this on a 150'+ trench to a detached garage but proceeded only after meeting prior with the inspector and getting thumbs up. We installed over a weekend and backfilled, inspector came Monday and taped the ports, and signed off. We put the ports every ~20' as agreed prior since that's what he wanted. Then since painters tape was used, we could twist the port breaking the tape and yank it out and throw it in the dumpster. Painters tape holds it tight and keeps dirt out.
