Distribution panel symbols are graphical icons used on single line diagrams and panel schedules to represent equipment inside an electrical distribution board. Non-expanded SVG files. Vector icons in SVG, PSD, PNG, EPS and ICON FONT Each symbol represents a specific electrical component, such as an outlet, switch, light fixture, or communication device, and often includes additional notation to specify its type, rating, or function. Adherence to established standards, such as those set by the National Electrical Code (NEC) or. When designing low-voltage and medium-voltage systems, a complete set of distribution panel symbols helps engineers, CAD designers and contractors understand how power flows through switchboards and panel boards. Electrical panel, in line design.