Electric | Conduit | Buried | Djs Affordable Contractor | United States

How deep should electrical conduit be buried?

Depth of Electrical Conduit

Electric wiring within inflexible, non-metallic conduits, like polyvinyl chloride (PVC), must be buried to a depth of 18 inches, under the National Electrical Code (NEC).  This specified depth ensures that the cables are adequately protected from damage during standard excavation activities. It is important to note that the required burial depth may vary based on the type of conduit utilized. Generally, PVC or acrylonitrile butadiene styrene (ABS) pipes may be buried at depths ranging from 18 to 24 inches, while metal conduits necessitate a minimum burial depth of 24 inches.

Furthermore, the conduit should be installed at a minimum depth of 18 inches below the frost line to safeguard against potential freezing. If you are considering installing electrical wiring outdoors to operate pumps, lighting, or other equipment, you have the option to run your wiring either overhead or within a below-ground trench. Should you opt for a trench, it is essential to be informed about the types of wiring and conduits permissible for use and the appropriate burial depths.

Below, you will find five recommendations regarding the burial of electrical wiring. Before commencing your project, it is advisable to review local and municipal regulations concerning cable burial and consult with local utility companies to mark the locations of their underground utilities on your property. Additionally, applying for a construction and electrical permit is imperative, as such permissions may be required within your municipality.

Direct Cable Burial  

UF (underground feeder cable) is specifically designed and manufactured with features suitable for burial. It should be buried at a depth of 24 inches to reduce the risk of being disturbed during standard digging. However, some municipalities and states/provinces mandate contacting local utilities for the installation of underground utilities on your property. When using UF cable, ensure it is not mistaken for (-metallic or Romex) cable.  Typically, UF cable is marked with information indicating it is UF.

Using UF Cable Above Ground  

While cable is primarily intended for burial, it can also be utilized above ground. For instance, if a portion of the cable is buried and another part is above ground, and you wish to avoid splicing the buried cable with an above-ground one, UF cable can be employed for the entire run. However, it is important to note that any UF cable used above ground should be enclosed in a conduit to safeguard it from potential damage.

Electrical Wire Encased in PVC Conduit  

The National Electric Code (NEC) stipulates that electric cable must be buried 18 inches deep in rigid, non-metallic conduit, such as PVC. Normal excavation is not likely to break or damage cable in any conduit, including PVC, buried at this depth. But remember, no conduit or cable is safe from being dug up by construction tools like backhoes or trench diggers.

Electrical Wire in Rigid Metal Conduit  

Because of its resilience, electrical wire can be buried in rigid metal conduit at a shallower depth. The NEC states that it can be buried as shallow as six inches.

Electrical Wire Encased in Flexible Metal Conduit

Electrical wire should be installed correctly and contained in flexible metal conduit to ensure functionality and safety. Before choosing flexible metal conduit, it is essential to confirm that it is impervious to possible harm or threats.

Djs Affordable Contractor can assist with your electrical needs.  Contact us at Djs Affordable Contractor or submit a ticket using the form below. 


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