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.
IEC
IEC · S2P
Two-pole one-way switch plan mark
Plan mark for a one-way switch that breaks both line and neutral, drawn with two ticks on the stroke.
In plain English
What does Two-pole one-way switch plan mark mean?
A two-pole one-way switch opens both poles of a single-phase circuit. The IEC plan convention adds a second tick to the one-way switch stroke, giving the reader an immediate visual cue that the switch interrupts both conductors.
A simple example
Two-pole switches are specified for outdoor lighting, appliances where both poles must be broken, and some heating loads. They are also used where a switch is expected to provide functional disconnection of a fixed appliance without a separate isolator.
What the drawings help you do
Two ticks do not mean the switch meets isolation requirements for maintenance. Where isolation is needed, the designer should show an isolator mark or state the isolating rating.
This particular reference
Plan mark for a one-way switch that breaks both line and neutral, drawn with two ticks on the stroke. The single-tick one-way switch breaks one pole only; the two-tick form breaks both.
- Phase
- One of the related AC waveforms in a power system.
- Terminal
- An identified point where a conductor connects.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: IEC graphical symbols for diagrams · Elementary switching devices
IEC · One-way switch, two 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 · S2P
What it represents
A two-pole one-way switch opens both poles of a single-phase circuit. The IEC plan convention adds a second tick to the one-way switch stroke, giving the reader an immediate visual cue that the switch interrupts both conductors.
Two-pole switches are specified for outdoor lighting, appliances where both poles must be broken, and some heating loads. They are also used where a switch is expected to provide functional disconnection of a fixed appliance without a separate isolator.
Two ticks do not mean the switch meets isolation requirements for maintenance. Where isolation is needed, the designer should show an isolator mark or state the isolating rating.
How to read it
- Count the ticks carefully when the drawing is reduced in size.
- Check whether a separate isolator is also shown for the same load.
Information to show or reference
- State whether isolation duty is intended.
- Tag the controlled load.
- Confirm current rating for heating or appliance loads.
A distinction that matters
The single-tick one-way switch breaks one pole only; the two-tick form breaks both.
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; independently drawn here.
Elementary switching devices
Distinguishes functional switching and isolation duties.
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.
Explore related references
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.