Program Requirements. Some essential, basic information about your program can be found in the Graduate Programs in the Graduate Catalog, including the program description, curriculum, and contact information. Doctoral Students. For your program's handbook, go to Graduate Handbooks and select your graduate program.
The National Electric Code requires that wire placed in Schedule 80 PVC must be buried at least 18 inches below ground. If the wire is being buried without PVC, it must be at least 24 inches underground.
Below are Unitilâs Underground Conduit Installation General Requirements. Proposers shall adhere to all requirements outlined below. TRENCH: 1. The conduit trench shall be between 42â (minimum) and 48â (maximum) in depth and 18â (minimum) in width. 2. Conduit trench shall not pass through soils such as mud, shifting soils, etc. 3. The trench bottom shall be smooth, flat and without surface irregularities. The bottom of the trench shall be free of debris such as rocks, wood, glass, etc. 4. If excavation is in ledge or rock, a 4â (minimum) layer of clean backfill (rocks not larger than 1-1/2â) is to be placed over the trench bottom prior to the installation of conduits. 5.