Electrical Diagrams and Schematics
ELECTRICAL DIAGRAMS AND SCHEMATICS
The important information in this chapter is summarized below.
Electrical Diagrams and Schematics Summary
This chapter covered the common symbols used on electrical diagrams and
schematics to represent the basic electrical components.
Polarity on a transformer is defined by dots placed on the primary and secondary
windings. On the primary side, the dot indicates current in; on the secondary, the
dot indicates current out.
Switches, relays, and interlocked equipment commonly use dashed lines or boxes
to indicate the relationship between them and other components.
Electrical components, such as relays, are drawn in the de-energized state unless
otherwise noted on the diagram.