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 · SPL
Switch with pilot light plan mark
Plan mark for a switch with an integral pilot lamp that shows when the controlled load is on.
In plain English
What does Switch with pilot light plan mark mean?
A switch with pilot light is used where the controlled load cannot be seen from the switch position, such as an external light, a water heater or a loft. The plan form adds a small lamp mark, a crossed circle, to the switch symbol.
A simple example
The pilot lamp needs a neutral at the switch in many accessory designs, so the symbol tells the electrician to bring a neutral to the switch box. It may also signal a double-pole switch for appliance control.
What the drawings help you do
The lamp mark does not tell you whether it lights when the load is on or when the switch is off as a locator. The specification decides.
This particular reference
Plan mark for a switch with an integral pilot lamp that shows when the controlled load is on. A plain one-way switch has no lamp; this form adds visual confirmation of the load state.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams · Pilot lights: public symbol reference
IEC · Switch with pilot lamp
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 · SPL
What it represents
A switch with pilot light is used where the controlled load cannot be seen from the switch position, such as an external light, a water heater or a loft. The plan form adds a small lamp mark, a crossed circle, to the switch symbol.
The pilot lamp needs a neutral at the switch in many accessory designs, so the symbol tells the electrician to bring a neutral to the switch box. It may also signal a double-pole switch for appliance control.
The lamp mark does not tell you whether it lights when the load is on or when the switch is off as a locator. The specification decides.
How to read it
- Check whether the lamp indicates load on or acts as a locator.
- Confirm a neutral is available at the switch.
Information to show or reference
- State lamp function.
- State pole count.
- Tag the remote load.
A distinction that matters
A plain one-way switch has no lamp; this form adds visual confirmation of the load state.
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.
Pilot lights: public symbol reference
Public lamp symbol family for comparing the indicator element.
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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