The Electric Currents in Shells Interface has these boundary and edge nodes available from the
Physics ribbon toolbar (Windows users),
Physics context menu (Mac or Linux users), or right-click to access the context menu (all users).
The edge conditions available in The Electric Currents in Shells Interface are applicable to exterior edges only. For shell interfaces,
exterior means exterior to the boundary selection. In other words; an edge that is connected to adjacent boundaries, only on one side. Consequently, an edge can be regarded as interior (and therefore, not applicable), even though it is
exterior to the domain that is enclosed by the shell boundary selection. See
Layer and Interface Selection Tools for more information.