120 V in a residential application is 12"

Scroll down to the first table.

18" for commercial in plastic conduit.  24" commercial without conduit.

6" residential for low voltage

 > WILTON wrote:

 Buried mine for about 120' to outbuilding (a little more
 than a shed - a shed doesn't usually have a slate roof) 27
 years ago all by myself using a flat shovel to make a slit
 about 10" deep.

10 inches [25 cm] is not really deep enough to be safe.  A
child and a shovel, or one swing with a pick can hit that.

I'm remembering 24 in is what NEC specs for protected cable.  I
don't remember what NEC says about direct burial cable.


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