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

IEEE / ANSI

ANSI/IEEE shielded conductor symbol

In IEEE-oriented drawings a shielded conductor is commonly shown with a broken or dashed enclosure around the conductor, sometimes with a short lead to a ground symbol. US instrumentation drawings use it for analogue signal wiring, thermocouple extension leads and drive feedback.

Drawing use: Schematic
Application: Connections & wiring
Reference family: IEEE / ANSI
Form evidence: Shielded conductor with broken enclosure. Independent illustration in IEEE drafting context; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

A shielded conductor intercepts interference; a coaxial cable uses its outer conductor as the signal return.

Full reference

IEC

Screened conductor

A screened conductor symbol adds an outline around one conductor to show a conductive screen, braid or foil surrounding the core. It is used for analogue instrument signals, encoder and thermocouple extension wiring and other circuits where capacitively coupled interference must be kept off the signal.

Drawing use: Schematic
Application: Connections & wiring
Reference family: IEC
Form evidence: Screened single-conductor form. Independent IEC-context illustration; consult IEC 60617 for the exact screen outline.

A distinction that matters

A screened conductor has a conductive shield; a cable-core grouping outline only shows that several cores share one sheath and implies no shielding.

Full reference

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