Electrical · E-HNB9Z

Underground Conduit Bank Concrete Encased Configurations

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This electrical detail shows underground conduit bank configurations encased in red concrete with multiple duct arrangements for two through eight conduits. Typical conduit spacing is maintained at three inches between ducts and from the outer edge of the concrete encasement. Encasement sizes vary by conduit count, including twelve by twenty-one inches for two conduits, twelve by thirty inches for three conduits, twenty-one by twenty-one inches for four conduits, twenty-one by thirty inches for five and six conduits, and twenty-one by thirty-eight inches for seven and eight conduits. All conduits are specified as five-inch diameter typical. Notes require resizing the encasement per conduit size for smaller conduits and providing tape markers.

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