Underground Electrical Conduit Depth

The raceways shall be covered by a minimum of 50 mm 2 in of concrete extending down to rock.

Underground electrical conduit depth.

Where solid rock prevents compliance with the cover depths specified in this table the wiring shall be installed in metal or non metallic raceway permitted for direct burial. At 24 inches you can bury underground feeder cable using pvc conduit to 18 inches below ground only where the wire comes up. Emt and imc conduits should not be used for underground electrical wiring installations. Buried wiring runs that transition from underground to above ground must be protected in conduit from the required cover depth or 18 inches whichever is less to its termination point above ground or at least 8 feet above grade.

Low voltage wiring carrying no more than 30 volts must be buried at least 6 inches deep. The depth for underground conduit is typically 18 inches depending on the specific installation and project type. In general bury metal conduits at least 6 inches below the soil surface. Cable in any conduit including pvc that is buried at this depth is not in danger of being severed or disturbed by normal digging.

You may also run them at a depth of 4 inches under a 4 inch concrete slab. At 18 inches you can use thwn 2 conductors inside a continuous length of pvc conduit which protects the wire all the way through the trench to the house. Running underground cables in metal conduits approved for buried cables is the most expensive method but also the one requiring the least digging. 2 job aid 08 underground electrical cable bury depth 5.