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Mar 15,  · This insulation is equal to roughly one foot of regular soil depth. So if your frost line is 5-feet below grade, install the 1-inch thick insulation at the 4-foot mark. Next, a segment of your conduit will eventually rise above grade through the frost. And this conduit segment will be prone to damage.

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Feb 24,  · There are a number of requirements including min. " cover for conduits exposed to earth or weather, and 3/4" cover for concrete not exposed to weather or in contact with the ground. Conduit should not be more than 1/3rd slab thickness. Spaced no closer than 3 diameters on center. This is a building code issue not an electrical code issue.