Can I use the drawing for a real project?

As a starting point for layout and layers, yes. The ratings, settings and cable sizes are made up, so the diagram has to be checked and changed for your project before it is used for design or construction.

Why are the layers coloured?

Colours and line weights follow the layers: power circuits are red and heavy, control is cyan, signal is green. The plot style table in the ZIP prints everything black and keeps the line weights, so you can plot in black and white as well.

Which CAD programs open it?

The drawing and the template are in AutoCAD 2018 format, which AutoCAD 2018 and later open, and so do other CAD programs that read this format. The browser viewer needs nothing installed.

Resources Building services symbols

Electrical installation plan: sample DWG and electrical template

A complete electrical installation plan of a small office and workshop building on an ISO A3 sheet at 1:100. The distribution board feeds three lighting circuits and two socket circuits; luminaires, switches, two-way switches, a dimmer, sockets, self-contained emergency luminaires and a water heater are placed on the floor plan and joined by the circuit wiring. A symbol key, a circuit schedule and a filled-in title block are included. All symbols are blocks from our IEC 60617 installation symbol library.

Free to use and modify in your own projects, including commercial ones. The ZIP holds the sample drawing, a template, a plot style table and a README; no add-in needed. The data in the drawing is made up, so it is not for design or construction. Provided as is, without warranty.

Download ZIP Preview in browser

This sample uses these resources

The symbols are blocks from our own libraries, with their attributes filled in. The sheet and its title block come from our ISO A3 title block template. Download them to draw your own diagrams.

What is in the ZIP

Electrical-Installation-Plan-Sample.dwg
Sample drawing (DWG, AutoCAD 2018 format)
Electrical-Template-ISO-A3.dwt
Template (DWT) that the drawing was made on
CADXChange-Monochrome.ctb
Plot style table (CTB) that prints every colour black
README.txt
README with the layer list and how to use the files

The template

The electrical template has 16 layers with colours, line weights and linetypes (power circuits, busbars, control, signal, protective earth, enclosure boundaries, text and more), the text styles ISO-2.5 to ISO-5, the dimension style ISO-25 and an ISO A3 layout with a title block and revision table. The layer names are a common convention, not a standard; rename them to match your company's rules.

Layers defined

Every layer in the template with its colour, line weight and linetype, and how many objects of this sample are on it. Layers the sample does not use are still defined, ready for your own drawing.

Layer	Colour	Line weight	Linetype	Used for	Objects here
Electrical layers
ELEC-POWER	1	0.50 mm	Continuous	Main power circuits	not used here
ELEC-BUS	1	0.70 mm	Continuous	Busbars and heavy lines	not used here
ELEC-CONTROL	4	0.25 mm	Continuous	Control circuits	not used here
ELEC-SIGNAL	3	0.18 mm	Continuous	Signal, instrumentation and communication circuits	not used here
ELEC-PE	2	0.35 mm	Continuous	Protective earth and bonding	not used here
ELEC-CABLE	30	0.25 mm	DASHED	Cable, conduit and tray routes	57
SYMBOL	7	0.25 mm	Continuous	Symbols (the layer the symbol libraries use)	59
ELEC-TERMINAL	7	0.25 mm	Continuous	Terminals and connection points	not used here
ELEC-BOUNDARY	5	0.18 mm	DASHDOT	Enclosure, panel and device boundaries	not used here
ELEC-MECH-LINK	8	0.18 mm	DASHED	Mechanical links, interlocks and measuring links	not used here
ELEC-REF	7	0.18 mm	Continuous	Reference designations (-QF1, -K2)	not used here
ELEC-WIRE-NO	7	0.18 mm	Continuous	Wire numbers and cable labels	5
ELEC-XREF	9	0.13 mm	Continuous	Contact and cross reference texts	64
ELEC-TEXT	7	0.18 mm	Continuous	General text	69
ELEC-NOTES	7	0.18 mm	Continuous	Notes and legends	4
ELEC-DIM	3	0.18 mm	Continuous	Dimensions	not used here
Sheet and symbol layers
0	7	default	Continuous	Default layer, keep it empty	not used here
FRAME	7	default	Continuous	Sheet border	5
TITLEBLOCK	7	default	Continuous	Title block and revision table	1
VIEWPORT	8	default	Continuous	Layout viewport frame (does not plot)	2
DRAWING-AREA	8	default	Continuous	Boundary of the model drawing area (does not plot)	2

Styles defined

The text styles, the dimension style and the linetypes that the template defines, so you do not have to set them up in each new drawing.

Kind	Name	Settings
Text style	ISO	isocp.shx, 15°, variable height
Text style	ISO-2.5	isocp.shx, 15°, 2.5 mm high
Text style	ISO-3.5	isocp.shx, 15°, 3.5 mm high
Text style	ISO-5	isocp.shx, 15°, 5 mm high
Text style	TB-en	Arial, used by the title block
Dimension style	ISO-25	Text 2.5 mm, arrows 2.5 mm, extension lines 1.25 mm beyond the dimension line and 0.625 mm from the object, dimension lines 3.75 mm apart, 0 decimals
Linetype	Continuous	Solid line
Linetype	DASHED	Dashed
Linetype	DASHDOT	Dash-dot
Linetype	CENTER	Centre line
Linetype	PHANTOM	Phantom line
Linetype	HIDDEN	Hidden line

Sheet and drawing setup

How the sheet is set up, so your own drawings print the same way.

Sheet: ISO A3 landscape, 420 × 297 mm.
Layout: One layout named ISO-A3, plotted at 1:1 on full-bleed A3 media, so the sheet has no printer margin.
Border: 20 mm from the left edge (binding side) and 10 mm from the other edges; the drawing area inside is 390 × 277 mm.
Model space: Units are millimetres. The drawing area is shown at 1:1, so 1 mm in the drawing is 1 mm on paper.
Title block: 160 × 79 mm at the lower right, with a four-line revision table above the company, project, title and approval fields.
Text size: 2.5 mm for labels and notes, 3.5 mm and 5 mm for headings.
Linetype scale: 1, so dashes are sized for plotting at 1:1.
Plot style: None set. Pick the CTB from the ZIP in the page setup for black-and-white plots.

Title block fields

The attributes of the title block. Double-click it to fill them in, or write them for a whole set of drawings with BlockSync.

Attribute	Field on the sheet	Value in this sample
COMPANY	COMPANY	CADXChange
PROJECT	PROJECT	Office and Workshop Building
AREA	AREA	Ground floor
SYSTEM	SYSTEM	230 / 400 V
CLIENT	CLIENT	Sample
TITLE	DRAWING TITLE	Electrical installation plan
DRAWING_NO	DRAWING NO.	E-301
CONTRACT_NO	CONTRACT NO.	—
REV	REV	A
DRAWN	DRAWN	—
CHECKED	CHECKED	—
APPROVED	APPROVED	—
DATE	DATE	2026-10-21
SCALE	SCALE	1:100
SHEET	SHEET	1
SHEET_OF	OF	1

Revision table: R1 to R4, each with REV, DATE, DESCRIPTION and BY (16 attributes, empty in this sample).

Blocks in the drawing

The equipment list of the drawing: block name, symbol and how many times it is placed. BlockSync exports the same list from your own drawings.

Symbol	Block	Placed
Luminaire, several tubes	IEC_LUMINAIRE_MULTI_TUBE	25
Socket outlet, protective contact	IEC_SOCKET_OUTLET_PE	11
Luminaire, fluorescent lamp	IEC_LUMINAIRE	6
Switch, general symbol	IEC_SWITCH_PLAN	5
2 way switch	IEC_SWITCH_2WAY	3
Emergency luminaire, self-contained	IEC_EMERGENCY_LUMINAIRE_SELF	3
Distribution centre	IEC_DISTRIBUTION_CENTRE	2
Dimmer	IEC_DIMMER	2
Water heater	IEC_WATER_HEATER	2

Equipment schedule

One row per placed symbol, read from the attributes of the blocks in the drawing: what is shown on the sheet, and the schedule attributes that were filled in but are not shown. BlockSync exports these same attributes from your own drawings.

Tag	Description	Shown on the sheet	Filled in, not shown
DB1	Distribution centreIEC_DISTRIBUTION_CENTRE		RATING = 63 ACIRCUIT = 6 ways
WH1	Water heaterIEC_WATER_HEATER		RATING = 3 kWCIRCUIT = P1

Manufacturer, model and remarks are left empty on every block, ready for your data. The values are examples.

How to use it

Open the sample drawing to see how layers, text and the title block are used, or open it in the browser first, nothing to install.
Start your own drawing from the template (NEW, then pick the DWT file). Copy the CTB file to your plot styles folder if you want black-and-white plots.
Insert blocks from the symbol library into your drawing. The blocks in the sample are copies; they do not change when a library changes.
Double-click the title block to fill it in, then export the equipment list with BlockSync.

Frequently asked questions

Can I use the drawing for a real project?: As a starting point for layout and layers, yes. The ratings, settings and cable sizes are made up, so the diagram has to be checked and changed for your project before it is used for design or construction.
Why are the layers coloured?: Colours and line weights follow the layers: power circuits are red and heavy, control is cyan, signal is green. The plot style table in the ZIP prints everything black and keeps the line weights, so you can plot in black and white as well.
Which CAD programs open it?: The drawing and the template are in AutoCAD 2018 format, which AutoCAD 2018 and later open, and so do other CAD programs that read this format. The browser viewer needs nothing installed.