This trench detail shows underground electrical conduit encased in select backfill surrounded by undisturbed earth and standard backfill materials. The conduit is set with a four-inch clearance from the trench bottom and six inches of select backfill cover, maintaining a ten-inch total select backfill zone. The trench depth measures twenty-four inches minimum to forty-eight inches maximum below the final grade. Minimum horizontal clearances include twelve inches of side clearance and twenty-four inches of undisturbed earth separation.
SOIL (TYPICAL) BACKFILL SELECT BACKFILL CONDUIT/CABLE UNDISTURBED EARTH FINAL GRADE 4" 6" 24" MIN. 12" MIN. 10" 24" MIN. 48" Max.
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