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Click the Grid View Command in the ribbon.
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In the tree view, click Conduit > Specifications > <spec name> > Conduit Rules > Permissible Nominal Conduit Diameters Rule.
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Click the Insert Row Command to insert a blank row in the grid view.
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In the Nominal Diameter column, type the nominal diameters to define in your conduit materials class.
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In the Unit Type column, type the units for your nominal diameter. For example, type mm or in.
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Click the Save Command .