Underground Electrical Conduit Depth

Low voltage wiring carrying no more than 30 volts must be buried at least 6 inches deep.

Underground electrical conduit depth.

You may also run them at a depth of 4 inches under a 4 inch concrete slab. The raceways shall be covered by a minimum of 50 mm 2 in of concrete extending down to rock. Emt and imc conduits should not be used for underground electrical wiring installations. 2 job aid 08 underground electrical cable bury depth 5.

At 24 inches you can bury underground feeder cable using pvc conduit to 18 inches below ground only where the wire comes up. The depth for underground conduit is typically 18 inches depending on the specific installation and project type. Running underground cables in metal conduits approved for buried cables is the most expensive method but also the one requiring the least digging. Conduits for underground electrical wiring pvc and rigid conduits are typically used when installing underground electrical wiring.

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. In general bury metal conduits at least 6 inches below the soil surface. The national electric code nec sets the required burial depth of electric wire in rigid non metallic conduit such as pvc at 18 inches. 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.