18 inches
In an area where freeze is present, 18 " is the minimum depth.
It's not a matter of how deep electrical wire should be buried. The wire should be protected by plastic or metal conduit and marked suitably above ground - buried utility. I am certain that you will be burying a water line to the fountain "below the frost line" for your area, so consider placing you electrical wires at the same depth.
ISOBATH
4' (1.2m)
Yellow
In an area where freeze is present, 18 " is the minimum depth.
A line segment has length. That is its only dimension. It does not have any width, or height or depth.
The frost line depth for Cheyenne, Wyoming is 36" for foundation.
It's not a matter of how deep electrical wire should be buried. The wire should be protected by plastic or metal conduit and marked suitably above ground - buried utility. I am certain that you will be burying a water line to the fountain "below the frost line" for your area, so consider placing you electrical wires at the same depth.
frost depth in eastern ohio
The frost depth level below area's usually not less than 800 mm .
What is the frost line depth in louisville Kentucky
The frost line depth for the Ottawa-Montreal area ranges from 1.4m to 1.5m below surface elevation.
Frost line depth is measured from grade (or lowest surface soil level pursuant to the foundation).
isobathn. line of map passing through all points of equal depth below water.
The average front line depth in Connecticut is around 42 inches. However, the frost line in northern areas of the state can reach depths of over 50 inches.
36"