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

GGBR

Symbols

GIS gas-zone boundary reference

Marks the manufacturer-defined gas compartment boundary on the primary arrangement. High-voltage primary equipment carries, interrupts, measures or conditions the main power circuit. Its function, insulation arrangement and equipment boundaries need to be distinguished from the secondary signals used to control it.

Drawing use: Schematic
Application: Power distribution
Reference family: Manufacturer

A distinction that matters

Electrical continuity does not establish a shared gas zone. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

Symbols

Power transformer

A power-transformer representation identifies equipment transferring electrical power between winding circuits. The generic mark can show the relationship between windings, but voltage levels, winding connections, vector group, rating and earthing information require additional annotations and equipment references.

Drawing use: SLD / Schematic
Application: Power distribution
Reference family: IEC / IEEE / ANSI

A distinction that matters

A transformer used for voltage measurement is a VT or PT. Its function and secondary circuit differ from those of a power transformer.

Full reference

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.