# Shaver supply unit

Canonical URL: https://eloragrid.ai/symbols/iec-shaver-supply-unit
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: SSU
Drawing use: GA
Reference families: IEC

## Symbol convention

Convention: IEC
Form: 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.

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.

### Terms

- 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.

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/)
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design)


## 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.

## Important distinction

A general outlet in a bathroom position is not isolated from earth; the shaver supply unit is.

## Facts

- Internal function: Safety isolating transformer feeding the outlet
- Typical location: Bathrooms and en-suites
- 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 committee context for graphical symbols used in diagrams and installation documents; not a source of reproduced artwork.
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design) — Schneider Electric — Electrical Installation Guide. Installation design methodology context: circuits, outlets and final distribution are planned before symbols are placed.

## 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.