120 V in a residential application is 12"
http://www.irrigation.org/uploadedFiles/Certification/National%20Electric%20Code.pdf
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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