The Insert Component dialog displays with a selection of predefined in-line markers and user-defined markers.
Select a marker and place it on a wire.
Note: If the label is too wide, use the Squeeze Attribute/Text tool. You can also use the Adjust In-Line Wire/Label Gap tool to adjust the gap width rather than squeezing the attribute to fit the gap.
Press ESC to exit the command.
Tip: You can also create wider marker symbols by following the block naming convention for terminal symbols. For example, the horizontal Red marker's file name is HTO_RED.dwg and the vertical version is VTO_RED.dwg. Libraries are in \Users\Public\Documents\Autodesk\Acade {version}\Libs\{library}\.AutoCAD Electrical toolset keys off of the first four characters of the block/drawing name.