Can a buried electric line cross a buried sewer line?
Here it's not an issue:  Sewer lines have to be below frost line, so they are put at 8 feet.  Electrical lines are, I think 3 feet, and can be less if protected.  This of course makes it difficult to run a sewer line after the electrical is in.

I would try very hard to keep buried lines from crossing.  SOMETIME one is going to be dug up for maintenance.