Q. What is the minimum cover requirement for an underground installation of a 13.8kV feeder installed in a 3-inch Schedule 80 rigid PVC nonmetallic conduit in the earth? Assume this is a general condition installation.

  1. 6 inches
  2. 18 inches
  3. 24 inches
  4. 30 inches

Answer: B

When referencing Tables 300.5 and 300.50, it’s important to note that the proper cover requirement is referenced to the top of the wiring method, not the depth to the bottom of the trench.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.