To represent the electrical part of your design, Mooble has items such as power outlets and light switches.
This library is located in the Decor - Installations - Lights Switches | Power Outlets menu.
To insert the item, just click and drag it to the 3D space.
To edit switch information, select the switch and on the information screen, access the Colors and Options tab. Through this tab, it is possible to edit the dimensions, position and insert symbology of switches and power outlets, being these, frontal or superior.
NOTE: In order for the symbology to be visible, you must keep the symbology layer active, within the Layers option.