iMesure offers single-line diagram drawing together with the electrical layout drawing. That is drafting on commission: we draw both in AutoCAD, based on data from the electrician or installer, or on a survey of the home. In Belgium, the inspection of an electrical installation requires both drawings. You receive a PDF to print and a DWG for later changes.
What is a single-line diagram, and what is a layout drawing?
A single-line diagram shows the installation’s structure: the board, the circuits, the protective devices and the connected appliances. Each circuit gets one line, however many conductors it has. A layout drawing is a floor plan of the home showing sockets, switches, lighting points and boards. Together they make the installation readable for anyone who inspects, repairs or extends it.
Who does what for the inspection?
The electrician or installer supplies the data, iMesure draws it up and a recognised inspection body inspects the installation. The diagrams must match the installation as it is actually wired, which is why this division of roles matters:
- The electrician or installer knows the installation, supplies the data and remains responsible for the content of the diagrams.
- iMesure draws up that data in AutoCAD: legible, consistent and with a legend of the symbols used.
- A recognised inspection body carries out the inspection and assesses the installation.
iMesure does not inspect installations and gives no opinion on whether yours complies. We provide clear diagrams that the electrician can check and the inspector can read easily.
What do we draw?
- Single-line diagram: the distribution board with its circuits, protective devices and connected appliances, set out from the electrician’s data.
- Layout drawing: a floor plan for each storey showing the position of sockets, switches, lighting points and distribution boards, with the matching circuit numbers.
- Legend and title block: the symbols used, the address of the installation and the date of the drawing.
- Updates: after an extension or alteration, we update the existing drawing with the electrician’s new data, so the diagrams still match the installation.
Based on data or on a survey
Using the electrician’s data
The electrician or installer sends us whatever data there is: a sketch of the board, a list of circuits, handwritten notes or an old diagram on paper or as a PDF. We turn it into a digital single-line diagram in AutoCAD, as when digitising plans. If anything is unclear, we check with the electrician. The electrician decides what goes into the diagram.
Using a survey by our experts
Old building plans often differ from the home as it is today. If there is no usable floor plan, our experts measure the home with a laser measuring instrument on a tripod and we draw the floor plan in AutoCAD. During that visit we also record where the sockets, switches, lighting points and boards are. The circuit layout and the protective devices come from the electrician, who knows the installation. Read more about on-site measuring by experts. If you need a full drawing of the existing situation, with elevations and sections, see as-built drawings, our drafting for construction.
For homeowners, electricians and installers
Homeowners need the diagrams for the inspection, for example of a new installation, after a major alteration or when selling the home. Your electrician supplies the data and we turn it into clear diagrams. For more on plans for your home, see homeowners.
Electricians and installers can outsource the drafting and keep working on the installation themselves. You supply the data; we draw in AutoCAD with a consistent set-up and a clear layer structure, or to your own layers and template. With the DWG you can amend the diagram yourself later, or have us do it.
What do you receive?
- PDF: printable, for the inspection and to keep with the installation’s paperwork.
- DWG: the editable file in AutoCAD’s native format, for later changes by you, the electrician or us.
On request we also supply DXF, for exchange with other software. No AutoCAD? You can view a DWG with the free DWG TrueView or Autodesk Viewer. If you use AutoCAD LT, you can open and edit the diagrams.
How a drafting job works
- Supply: you send what you have, such as the electrician’s data, a sketch of the board, an old diagram, an existing floor plan or photos.
- Agreement and quote: we discuss which diagrams are needed, which storeys, which symbols or templates and which delivery format. You then receive a quote. If there is no usable floor plan, we first schedule an on-site survey.
- Drafting in AutoCAD: single-line diagram, layout drawing to scale, legend and title block, with a clear layer structure. We raise any questions as we go.
- Check and delivery: the electrician or installer checks the diagrams, we work in the comments and deliver PDF and DWG, and DXF on request.
For the standard steps, see how we work. Drafting on commission is done digitally, so it works anywhere: you send the material and receive the drawings by email or download link. For where we survey on site, see our service area.
Have your electrical drawings made
Send the electrician’s data or a short description to info@imesure.com, or get in touch. If you also need floor plans, elevations or sections, see CAD drafting on commission.
Frequently asked questions
Does iMesure also inspect the electrical installation?
No. iMesure draws the single-line diagram and the layout drawing, but does not inspect installations. The inspection is carried out by a recognised inspection body. The electrician or installer remains responsible for the content of the diagrams, because they know the installation and supply the data. We make sure that data is set out clearly and legibly in AutoCAD, as a PDF and a DWG.
Is a single-line diagram required for the inspection?
Yes. In Belgium, the inspection of an electrical installation requires a single-line diagram and a layout drawing. When your installation needs inspecting, and what exactly the inspector checks, is best asked of your electrician or a recognised inspection body. iMesure draws the diagrams, but does not inspect installations and gives no legal advice on these points.
What information does iMesure need to draw the diagrams?
For the single-line diagram, iMesure needs the electrician's data: the layout of the distribution board, the circuits with their protective devices and what is connected to each circuit. A sketch, a list or an old diagram can serve as a starting point. For the layout drawing, a usable floor plan of the home is needed, or an on-site survey by our experts.
Can an old single-line diagram on paper be redrawn?
Yes. iMesure redraws an existing single-line diagram or layout drawing, on paper or as a PDF, in AutoCAD. If the old diagram no longer matches the installation, for example after an extension, the electrician passes on the changes. We draw, but do not check the installation itself. You receive a legible diagram as a PDF and a DWG.
In what format do I receive the electrical drawings?
You receive a PDF to print and a DWG, the editable AutoCAD format. The PDF is for the inspection and for the installation's paperwork. The DWG is useful for the electrician or for later changes. Without AutoCAD, you can view the DWG with the free DWG TrueView or Autodesk Viewer.
Does iMesure also draw diagrams for electricians and installers?
Yes. Electricians and installers can outsource the drawing of single-line diagrams and layout drawings to iMesure. You supply the installation data, we draw in AutoCAD and you receive a PDF and a DWG. The content remains your responsibility. We provide a legible, consistent drawing that you can amend yourself later.