- Basic drawings and diagrams - Read and interpret electrical drawings and one-line diagrams.
- System One-Line Diagram [PDF] A one-line diagram (single line) is "a diagram that shows, by means of single line and graphic symbols, the course of an electric circuit or system of circuits and the component devices or parts used therein."
- Electrical One-Line Diagram Symbols One-line diagrams are an important means of communicating the components, relationships, and connections within a circuit or electrical system. The one-line diagram symbols presented here are commonly accepted symbols.
- ANSI/IEEE Standard Device Numbers Device numbers are specified in ANSI/IEEE Standard C37.2 and are used to identify the functions of a device shown on a schematic diagram.
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