Board
Switchboard
A distribution assembly represented by a generic envelope in an arrangement drawing.
GA objects
IEC · DB
Distribution board plan mark
Plan mark showing the position of a distribution board or consumer unit on an installation layout.
In plain English
What does Distribution board plan mark mean?
On installation plans a distribution board is drawn as a rectangle against the wall, typically half filled or crossed, with its designation such as DB-1 written beside it. Home-run arrows from outlets and lights terminate in labels that refer back to this board.
A simple example
The mark tells the reader where circuits originate and where the board schedule applies. In domestic work the same form is used for a consumer unit, often labelled CU. Clearance in front of the board and access requirements should be checked against the architectural plan.
What the drawings help you do
The plan mark does not show the internal arrangement. The board schedule and single-line diagram show incoming supply, protective devices and circuits.
This particular reference
Plan mark showing the position of a distribution board or consumer unit on an installation layout. A switchboard object on a general arrangement shows a physical lineup; the plan mark only locates a board on a building plan.
- 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 · Distribution board, installation plan
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 · DB
What it represents
On installation plans a distribution board is drawn as a rectangle against the wall, typically half filled or crossed, with its designation such as DB-1 written beside it. Home-run arrows from outlets and lights terminate in labels that refer back to this board.
The mark tells the reader where circuits originate and where the board schedule applies. In domestic work the same form is used for a consumer unit, often labelled CU. Clearance in front of the board and access requirements should be checked against the architectural plan.
The plan mark does not show the internal arrangement. The board schedule and single-line diagram show incoming supply, protective devices and circuits.
How to read it
- Read the designation and look up the board schedule.
- Check clearances and mounting height.
Information to show or reference
- Label the board designation.
- Reference the board schedule.
- Show clear working space.
A distinction that matters
A switchboard object on a GA shows a physical lineup; the plan mark only locates a board on a building plan.
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.
Electrical installation design methodology and references
Installation design methodology: circuits are allocated to boards.
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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