According to NEC how deep must outside 220V wiring be buried?
Answers:
18" and use schedule 40 PVC I also have used schedule 80 (thicker) pvc and a uf (sunlight resistant cable) preferably 3-conductor (Black, red, white and ground)
Other answers:
80 centimetre
80 centimetre
Six inches. (cksq)
Depends, under a roadway, driveway or anyplace with vehicle traffic 24", assuming you are using PVC sch 40. You can go as low as 6" if you use rigid conduit. In your yard 18' using sch 40 pvc.