Electrical · E-DERDM

Underground Electrical Trenching and Conduit Detail

Materials

About this detail

This trench detail shows an underground electrical installation with a PVC conduit set in a concrete encasement surrounded by undisturbed earth and wheel-compacted backfill. The assembly specifies a minimum cover depth of thirty-six inches to finished grade, with three inches of concrete clearance below the conduit and one-and-a-quarter inches of side clearance. A detectable warning tape is positioned twelve inches below the finished grade within the backfill zone. Notes require over-excavating trenches for sand bedding or unstable soil conditions and specifying acid- and alkali-resistant polyethylene warning tape with a metallic core.

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