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 single-pole switch plan symbol

US architectural electrical plans mark a single-pole wall switch with the letter S beside the wall, usually with a short line to the wall. A curved dashed switch leg runs to the controlled lighting outlets, and lowercase letters can tie a switch to specific fixtures.

Drawing use: GA
Application: Installation & communications
Reference family: IEEE / ANSI
Form evidence: Single-pole switch, S. US architectural electrical plan practice in the ANSI Y32.9 lineage, read alongside IEEE 315 context; independently drawn, not a certified IEEE or ANSI graphic.

A distinction that matters

The IEC one-way switch is drawn as a circle with a stroke; the US form is the letter S.

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.