In viewing residential burial requirements from 300.5 nec. I am coming to the conclusion that a direct burial cable could be at a depth of 18".
Based on using the table 300.5.
6th requirement down covers residential requirements. Stating "One- and two- family dwelling driveways and outdoor parking areas,
*** and used only for dwelling-related purpose.***"
Covering this article requirement, and breaking down the paragraph. residential driveways Is addressed, as well as “used for dwelling purposes only”, this last statement reads to me this would cover the yard as well. It does not make sense for the burial area of a driveway to be less than that of the yard.
The reason I am asking. It has been suggested to us the 24" requirement at the top. "all locations not specified below" . Evan thou yard is not specified I believe it is used only for dwelling related purposes.
Thank you, please incite me