You can add tags to electrical components, including panels and transformers to identify them in a project.
You must have the appropriate annotation family loaded before you can tag a piece of electrical equipment.
Once you have added a tag, you can use the Family Editor to specify the parameters that are displayed for the tag. See Annotation Labels.
Load the electrical equipment tag family
 Model panel
Model panel Component drop-down
Component drop-down Place a Component, and in the Load Family dialog, navigate to the Annotations\Electrical folder.
Place a Component, and in the Load Family dialog, navigate to the Annotations\Electrical folder. For example, for electrical equipment, select Electrical Equipment Tag.rfa.
Apply the tag
 Tag panel
Tag panel Tag By Category.
Tag By Category.  ) lets you specify Horizontal or Vertical orientation of the tag.
) lets you specify Horizontal or Vertical orientation of the tag. Attached End specifies that the leader contacts the component in the view. Free End specifies a gap between the component and the leader.
The tag appears in the view.