Schematic Representation of Electrical Components

The schematic is the most common place where the technician will find electronic symbols. The schematic is a diagram that depicts the interconnection and logic of an electronic or electrical circuit. Many symbols are employed for use in the schematic drawings, blueprints, and illustrations. This section briefly outlines some of the more common symbols and explains how to interpret them.

Conductors

The schematic depiction of a conductor is simple enough. This is generally shown as a solid line. However, the line types may vary depending on who drew the schematics and what exactly the line represents. While the solid line is used to depict the wire or conductor, schematics used for modifications can also use other line types such as a dashed to represent “existing” wires prior to modification and solid lines for “new” wires.

There are two methods employed to show wire cross-overs and wire connections. Figure 44 shows the two methods of drawing wires that cross, version A and version B. Figure 45 shows the two methods for drawing wire that connect version A and version B. If version A in Figure 44 is used to depict crossovers, then version A for wire connections in Figure 45 will be used. The same can then be said about the use of version B methods. The technician will encounter both in common use.