S2W
Two-way light switch plan mark
Plan mark for a two-way switch used in pairs so one lighting group can be switched from two places.
IEC
IEC · S1
One-way light switch plan mark
Installation plan mark for a single-pole one-way switch that turns a lighting circuit on and off from one place.
In plain English
What does One-way light switch plan mark mean?
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.
A simple example
Gang count is shown by repeating the switch or by writing a number beside it, so a two-gang plate controlling two lighting groups appears as two strokes or a 2. Mounting height is normally covered by a general note rather than on each symbol.
What the drawings help you do
The symbol shows a switching function and position only. It does not show the rating, the plate finish or whether the switch is single-pole or double-pole beyond the single tick convention.
This particular reference
Installation plan mark for a single-pole one-way switch that turns a lighting circuit on and off from one place. 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.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams · Elementary switching devices
IEC · 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.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
GA · S1
What it represents
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.
Gang count is shown by repeating the switch or by writing a number beside it, so a two-gang plate controlling two lighting groups appears as two strokes or a 2. Mounting height is normally covered by a general note rather than on each symbol.
The symbol shows a switching function and position only. It does not show the rating, the plate finish or whether the switch is single-pole or double-pole beyond the single tick convention.
How to read it
- Follow the switching line to the luminaires; the symbol alone does not say what it controls.
- Count ticks: one tick for single-pole one-way, two ticks for double-pole.
Information to show or reference
- Draw switching links to every controlled luminaire.
- Indicate gang count where switches share a plate.
- Reference mounting height in the general notes.
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.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEC graphical symbols for diagrams
IEC graphical symbol context for installation diagrams; not a source of reproduced artwork.
Elementary switching devices
Functional switching explained separately from isolation and protection.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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