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

IEC

Dimmer switch plan mark

A dimmer varies the power delivered to luminaires using phase-cut electronics or a control signal. IEC-style plans typically draw the switch mark with an oblique arrow or a small adjustment mark to show continuous variation, and the switching line links it to the dimmed group.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Dimmer switch. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A one-way switch has no variability mark; the dimmer adds continuous control of light output.

Full reference

IEC

One-way light switch plan mark

The one-way switch is drawn on IEC-style plans as a small circle at the switch position with a short stroke ending in one tick. A dashed or curved switching line usually runs from the symbol to the luminaires it controls, telling the electrician which lights are switched together.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: One-way switch, single pole. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A two-way switch has a second stroke so it can be paired with another switch; the one-way form controls from one point only.

Full reference

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