Understand the difference.

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

W

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 referenceAdd to legend

W

IEC

Screened conductor with earthed screen

This form combines the screen outline with an explicit earth connection on the screen tail. It answers the question that a plain screened conductor leaves open: which end of the screen is earthed. Instrument drawings commonly earth the screen at the control end only, while drive motor cables are often earthed at both ends through 360 degree glands.

Drawing use

Schematic

Application

Connections & wiring

Reference family

IEC

Form evidence

Screened conductor with earthed screen tail. Independent illustration combining IEC-context screen and earth forms; not certified IEC geometry.

A distinction that matters

An earthed screen shows the termination decision; a plain screened conductor shows only that a shield exists.

Full referenceAdd to legend

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