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

ITI

Symbols

Incomer transfer-in-progress indication

Reports that the documented source-transfer sequence is active and not yet complete. A source and bus arrangement shows how incoming supplies and outgoing circuits can be connected. Breaker and tie positions determine which sections are energized and whether sources can become electrically paralleled.

Drawing use: Schematic
Application: Control circuits
Reference family: Manufacturer

A distinction that matters

Intermediate states need explicit indication. 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

Bus

Symbols

Busbar

A busbar connects multiple power circuits to a common electrical node. In an SLD it is commonly represented as a line with feeder connections. The representation describes connectivity; physical conductor dimensions, enclosure, phase arrangement and current-carrying capabilities are separate equipment information.

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

A distinction that matters

A busbar is an electrical connection. Busbar trunking is a physical distribution system with model-specific enclosures and fittings.

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.