WireCAD System Design Tools WireCAD Design Tools for the systems designer. WireCAD tools create single line functional block diagrams with full database support. Automatically generate rack layouts, cable Support · CAD Basics · Software · Login · Dev Blog · Tutorials Electrical CAD software for drawing electrical wiring diagrams The software keeps track of the cable wires. All you have to do is therefore to pick a cable in the database, and then point out which lines on the diagrams are representing the cable wires. When you specify that a line on a diagram is a wire in a cable, you get a survey of the available cable wires for this specific cable.