Symbols · AC 1PH

Single-phase AC source

A single-phase AC source identifies a documented source boundary in a schematic or SLD.

SLD / Schematic · AC 1PHSingle-phase AC source: original educational illustration
Original educational illustrationNot to scale · See source and graphic notes

What it represents

A single-phase AC source identifies a documented source boundary in a schematic or SLD. The source label and supply data explain what provides the circuit's voltage and frequency.

How to read it

  • Determine whether the source is a utility connection, transformer winding or auxiliary source.
  • The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.

Information to show or reference

  • Name source origin
  • State voltage/frequency
  • Show conductor and neutral arrangement

A distinction that matters

A source-boundary symbol is not a product-specific generator or transformer diagram.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

AutoCAD Electrical: Earthing, sources and surge protection

Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.

Autodesk · Public reference checked 13 October 2026 · Link only

About this graphic

This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.

SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.

Entry JSON · Entry Markdown · Last editorial update: 13 October 2026

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