Before you can use the Schematics extension you need to enable the extension in ArcCatalog and ArcMap.

To do so, start ArcCatalog, click Tools on the main menu and click Extensions. Check the Schematics check box and click Close.

In ArcCatalog, navigate to the C:\arcgis\ArcTutor\Schematics\Schematics folder in the Catalog tree. This is the default installation location for this data. Double-click the ElecDemo.mxd file.

To enable the extension in ArcMap, click Tools on the main menu and click Extensions. Check the Schematics check box and click Close.

To add the Schematics toolbars in ArcMap, click Tools on the main menu and click Customize. Check the Schematic, Schematic Editor, and Schematic Network Analyst check boxes and click Close.