I would bed and cover with sand if I was installing underground on my boney land. You should also place a marking tape on top of the cover sand so hopefully you (or someone else) doesn't dig into it someday.
Ken
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In my area they want us to run conduit. The inspector won’t allow a sand bed anymore. For 4/0 wire he wants schedule 80, 4”. And that in my area is $58 for 10ft conduit. And for crossings the want galvanized pipe. We asked arcade electric to run high voltage wire and run 2” schedule 80 pvc conduit that is $38 for a 10ft section. The cheapest part was the wire. And the majority of the conduit would be galvanized conduit. And it’s a lot more then pvc. We crunched numbers and we are building a sugar house near the road. Maybe someday we will get electricity back to our woods, but not right now with the prices this high. Thanks everyone for there know how and help it’s greatly appreciated.