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[PDF] ELECTRICAL SYMBOL LEGEND GENERAL NOTES when electrical boxes are located in vertical fire-resistive assemblies, (classified as fire/smoke and smoke partitions), they shall be installed without affecting the fire classification. all of the following conditions shall be met: a. all electrical boxes shall be metallic. b. box opening shall occur only on one side of framing space.