Overview
IEC 81714-2:2006 - Design of graphical symbols for use in the technical documentation of products (Part 2) specifies how graphical symbols should be represented in a computer sensible form for inclusion in a reference symbol library and for interchange among computer-aided tools. The standard defines how symbol libraries are structured and documented so symbols can be reused, scaled, routed and exchanged reliably between CAD, electrical design and documentation systems.
Key Topics
- Computer-sensible symbol representation: Requirements for encoding graphical symbols so they are machine-readable and consistent across tools.
- Reference symbol library structure: Rules for organizing symbols, variants, module sizes and default layouts to support reuse.
- Variants and scaling: Guidance on symbol variants, scaling behavior and module/grid sizes to preserve visual and functional integrity.
- Connect nodes and reference points: Definitions for nodes, markers, and reference points used for routing, placement and connection in diagrams.
- Text and labeling: Requirements for text fields, alignment, label placement and identification of terminals and functions.
- Layering and graphical constructs: Use of layers and building blocks to manage symbol visibility, variants and editing.
- Interchange requirements: Specifications and informative guidance (including Annex B) for exchanging diagrams and symbol libraries between computer-aided tools.
- Normative annexes: Formal requirements for data types/formats, line and text properties, library versions and global definitions to ensure interoperability.
Applications / Who uses this standard
IEC 81714-2 is practical for organizations and professionals who develop, manage or consume technical drawings and product documentation:
- CAD and EDA software developers - implement symbol library formats and import/export functions for interoperability.
- Electrical and electronic engineers - create consistent schematic symbols for design and documentation.
- Technical authors and documentation teams - standardize symbols across manuals, service documents and product datasheets.
- Manufacturers and OEMs - ensure consistent symbol use across product lines and suppliers.
- Standards bodies and library maintainers - build compliant reference symbol libraries for distribution and reuse.
Practical benefits include more reliable symbol interchange, consistent technical documentation, reduced rework when migrating between tools, and clearer maintenance/assembly instructions.
Related Standards
- IEC 60617 and ISO 14617 - graphical symbol repositories and graphical symbol definitions referenced by IEC 81714-2.
- Annexes in IEC 81714-2 cover interchange models, data types, text/line requirements and versioning to support tool interoperability.
Keywords: IEC 81714-2, graphical symbols, reference symbol library, computer sensible form, symbol interchange, CAD, technical documentation, symbol libraries.