GA
Smoke detector installation point
A detector installation point records the selected fire-detection location in a coordinated room drawing.
GA objects
IEC · SD
Smoke detector plan symbol
Fire alarm plan symbol for a point smoke detector, drawn as a detector box with a smoke indication.
In plain English
What does Smoke detector plan mean?
Point smoke detectors are drawn on fire alarm layouts as a square or circle with a smoke mark inside, such as wavy lines or the letter S, at their ceiling position. Each symbol is usually tagged with its loop and device address so the plan doubles as the commissioning record.
A simple example
Spacing and coverage radius depend on ceiling height and the applicable fire detection code, so the plan is used to check coverage. Detectors near air supply grilles, in voids or in lift shafts need special attention and often appear with extra annotations.
What the drawings help you do
The symbol does not tell you whether the detector is optical, ionisation or multi-sensor unless tagged. A separate general arrangement object may record its physical installation point.
This particular reference
Fire alarm plan symbol for a point smoke detector, drawn as a detector box with a smoke indication. A heat detector responds to temperature, not smoke; it uses a different internal mark.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- 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 · Smoke detector
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 · SD
What it represents
Point smoke detectors are drawn on fire alarm layouts as a square or circle with a smoke mark inside, such as wavy lines or the letter S, at their ceiling position. Each symbol is usually tagged with its loop and device address so the plan doubles as the commissioning record.
Spacing and coverage radius depend on ceiling height and the applicable fire detection code, so the plan is used to check coverage. Detectors near air supply grilles, in voids or in lift shafts need special attention and often appear with extra annotations.
The symbol does not tell you whether the detector is optical, ionisation or multi-sensor unless tagged. A separate GA object may record its physical installation point.
How to read it
- Read the loop and address tag.
- Check spacing against coverage requirements.
Information to show or reference
- Tag loop and address.
- State detector type.
- Note void or concealed locations needing indicators.
A distinction that matters
A heat detector responds to temperature, not smoke; it uses a different internal mark.
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 for installation plans; independently drawn here.
Electrical installation design methodology and references
Installation design context: life-safety systems are coordinated with the building electrical design.
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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