Electric Symbols on Blueprints - House Plans Helper Electric Symbols on Blueprints. If you want to make sense of electric symbols on your blueprints then you’ve come to the right place. The placement of the outlets for all the electrical items in your home can have a significant impact on the design of your home. If you'd like a free pdf of all the blueprint and floor plan symbols go ahead and sign up below.Lighting Symbols · TV · Floor Plan Symbols · Free Blueprint Symbols · HVAC Symbols Wiring Diagram Symbols - Electrical Wiring Symbol Legend Wiring diagrams use special symbols to represent the switches, light, outlet and electrical equipments. Here is a standard wiring symbol legend showing a detailed documentation of common symbols that are used in wiring diagrams, home wiring plans, and electrical wiring blueprints. Electrical switchbox. Single pole switch. Three-way switch.