Opening a geometric network feature class

Steps:

1. Open the document to which you want to add the network data or create a new document.
2. Click the Add Data button .
3. Navigate to the feature dataset in the geodatabase that contains the network you want to open.
4. Double-click the feature dataset to view the feature classes and geometric networks that it contains.
5. Click the geometric network and click Add.

Your geometric network is added to ArcMap.