# Two-pole one-way switch plan mark

Canonical URL: https://eloragrid.ai/symbols/iec-two-pole-light-switch
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: S2P
Drawing use: GA
Reference families: IEC

## Symbol convention

Convention: IEC
Form: 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.

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.

### Terms

- 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.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)
- [Elementary switching devices](https://www.electrical-installation.org/enwiki/Elementary_switching_devices)


## 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.

## Important distinction

The single-tick one-way switch breaks one pole only; the two-tick form breaks both.

## Facts

- Graphic cue: Two ticks on the switch stroke
- Typical uses: Heaters, outdoor lighting, appliance control
- Exact standard graphic: Not reproduced here; confirm the form against IEC 60617 and the project legend

## Public references

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC graphical symbol context; independently drawn here.
- [Elementary switching devices](https://www.electrical-installation.org/enwiki/Elementary_switching_devices) — Schneider Electric — Electrical Installation Guide. Distinguishes functional switching and isolation duties.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.