TS 631

TS 631 is a standard concerned with graphical symbol forms for electrical machines, transformers, primary cells, and accumulators. In electrical diagrams, equipment labels, and technical drawings, these symbols provide a language-independent way to identify function and component type. In engineering documentation, such symbols help simplify representation, speed up reading, and create a common visual language across different users and organisations.

The technical role of graphical symbols

Electrical machines, transformers, primary cells, and accumulators are core equipment classes associated with generating, converting, or storing electrical energy. Graphical symbols allow these devices to be shown at circuit or system level without relying on detailed pictorial drawings. In schematic practice, a consistent symbol set makes it easier to distinguish motors, generators, transformers, cells, and battery arrangements. More broadly, symbol consistency reduces the risk of misinterpretation for designers, maintenance staff, and production teams.

What this standard covers

The scope of this standard is the graphical symbol forms for electrical machines, transformers, primary cells, and accumulators. In other words, it is focused on how these items are represented visually, not on their electrical performance, dimensions, or safety requirements. TS 631 has also been withdrawn and replaced by TS 11330, TS 11331, TS 11332, TS 11333, and TS 11334. It therefore belongs to the historical IEC 117 symbol family rather than to a current active reference edition.

• Graphical symbol forms used in electrical diagrams and technical drawings
• Visual representation for electrical machines and transformers
• Symbolic representation for primary cells and accumulators
• Support for standardised, language-independent technical communication