Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

SPARK GAP

Symbols

Spark-gap protective element

A spark-gap element provides a documented breakdown path across separated electrodes. Its drawing identifies the protective location without implying the same behaviour as a semiconductor clamp.

Drawing use: SLD / Schematic
Application: Connections & wiring
Reference family: IEC / Manufacturer

A distinction that matters

A spark-gap element and a varistor use different protective mechanisms.

Full reference

Symbols

Protective earth

Protective-earth identification indicates a connection serving the protective earthing function. It should be distinguished from functional earthing, signal references and other grounding conventions. The drawing context and applicable documentation establish the meaning of each connection.

Drawing use: SLD / Schematic
Application: Connections & wiring
Reference family: IEC / IEEE / ANSI

A distinction that matters

Protective earth, functional earth and a signal common are different functions even when a drawing uses visually related marks.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.