Large PVC Duct

4.2 Raceways (Underground): All underground conduit should be PVC or RGS. Conduits should be concrete encased when buried underneath roadways or when used for medium-voltage applications. Minimum size for conduits used for medium voltage should be 129 mm. Generally, conduits serving exterior pole-mounted lighting fixtures should be 53 mm in size. Direct-buried conduit is acceptable for electrical systems rated 600 volts and below. Rigid steel may be direct-buried if coated with asphalt paint or PVC coating.

PVC electrical conduit for underground runs should be a minimum of type EB if concrete encased or schedule 40 if direct-buried. Marking tape indicating “Electrical Cable Buried Below” should be installed in accordance with the latest applicable industry standards. All empty ducts should be provided with 4 mm minimum diameter nylon pull wire for pulling future cables.

All empty ducts should be sealed to prevent water seepage into the handhole or manhole. Ducts should be sloped to prevent water drainage into the building.

Prior to pulling cable into any conduit (whether new or existing), the conduit should be cleaned with a wire brush 16 mm larger than the duct and rodded with a mandrel 8 mm smaller than the duct to test the integrity of the duct.

Credit: Large PVC Duct

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