SO
Socket outlet with protective earth contact
Installation plan mark for a socket outlet that includes a protective earth contact for Class I appliances.
IEC
IEC · SSU
Shaver supply unit
Plan mark for a socket outlet fed through a safety isolating transformer, typically a bathroom shaver point.
In plain English
What does Shaver supply unit mean?
A shaver supply unit contains a small isolating transformer so that the outlet is not referenced to earth. IEC-style plan symbols show the outlet half circle with two linked circles on the lead, the same pair of circles used for a transformer in diagrams, to show that the outlet is fed through isolation.
A simple example
This is the only general outlet permitted in some bathroom zones, so the symbol tells the installer which accessory to buy and tells the inspector why an outlet appears close to a basin. The low power rating means it is for shavers and toothbrushes, not hair dryers or heaters.
What the drawings help you do
The symbol does not show the transformer rating or the dual-voltage selector that many units include. A plain outlet drawn in a bathroom is not the same and may breach zone requirements.
This particular reference
Plan mark for a socket outlet fed through a safety isolating transformer, typically a bathroom shaver point. A general outlet in a bathroom position is not isolated from earth; the shaver supply unit is.
- Winding
- A coil of conductor inside an electrical machine or transformer.
- 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 · Electrical installation design methodology and references
IEC · Socket outlet with isolating transformer
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 · SSU
What it represents
A shaver supply unit contains a small isolating transformer so that the outlet is not referenced to earth. IEC-style plan symbols show the outlet half circle with two linked circles on the lead, the same pair of circles used for a transformer in diagrams, to show that the outlet is fed through isolation.
This is the only general outlet permitted in some bathroom zones, so the symbol tells the installer which accessory to buy and tells the inspector why an outlet appears close to a basin. The low power rating means it is for shavers and toothbrushes, not hair dryers or heaters.
The symbol does not show the transformer rating or the dual-voltage selector that many units include. A plain outlet drawn in a bathroom is not the same and may breach zone requirements.
How to read it
- The two linked circles are the key difference from an ordinary outlet.
- Check the location against the bathroom zone drawing.
Information to show or reference
- Confirm the unit is a shaver supply unit, not a general outlet.
- Show its zone position relative to bath or shower.
- Tag circuit and any residual-current protection.
A distinction that matters
A general outlet in a bathroom position is not isolated from earth; the shaver supply unit is.
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 committee context for graphical symbols used in diagrams and installation documents; not a source of reproduced artwork.
Electrical installation design methodology and references
Installation design methodology context: circuits, outlets and final distribution are planned before symbols are placed.
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.