PLC Training - Reading electrical wiring diagrams and The switch would be labeled 301SW1 in the field. That way when someone looks at the switch, they know exactly where to find it in the wiring diagram. Next you see a label "3011". This is the wire number of the wire that connects the switch to the relay and it should be labeled as such on each end of the wire and in any junctions that connects it. Types of Electrical Drawing and Diagrams - Electrical Wiring Diagram. The wiring diagram is used for the representation of electrical components in their approximate physical location using their specific symbols and their interconnections using lines. Vertical and horizontal lines are used to represent wires and each line represents a single wire that connects between electrical components.
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