HAN1S
Audible siren
A siren indication identifies an audible alarm output with the documented operating role.
IEC
IEC · SNDR
Fire alarm sounder plan symbol
Plan symbol for a fire alarm sounder that gives the audible evacuation signal.
In plain English
What does Fire alarm sounder plan mean?
Fire alarm sounders are drawn as a horn shape or a square with a sound mark, at wall or ceiling positions throughout the building. Their spacing is set by the required sound pressure level above ambient in each area.
A simple example
Sounders are on sounder circuits or addressable loops, so the plan tags their circuit and address. Bedrooms and noisy plant rooms may require extra devices or visual alarms. The symbol does not state sound level or tone. Audibility is verified by commissioning measurements.
What the drawings help you do
Check spacing in noisy areas. Read circuit or loop tag. A schematic siren or buzzer symbol represents a component; this plan symbol marks a building alarm device.
This particular reference
Plan symbol for a fire alarm sounder that gives the audible evacuation signal. A schematic siren or buzzer symbol represents a component; this plan symbol marks a building alarm device.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams · Autodesk IEC-60617 preview: Electroacoustic annunciation forms
IEC · Fire alarm sounder
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 · SNDR
What it represents
Fire alarm sounders are drawn as a horn shape or a square with a sound mark, at wall or ceiling positions throughout the building. Their spacing is set by the required sound pressure level above ambient in each area.
Sounders are on sounder circuits or addressable loops, so the plan tags their circuit and address. Bedrooms and noisy plant rooms may require extra devices or visual alarms. The symbol does not state sound level or tone. Audibility is verified by commissioning measurements.
How to read it
- Check spacing in noisy areas.
- Read circuit or loop tag.
Information to show or reference
- Tag circuit.
- State tone and level.
- Add visual devices where needed.
A distinction that matters
A schematic siren or buzzer symbol represents a component; this plan symbol marks a building alarm device.
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.
Autodesk IEC-60617 preview: Electroacoustic annunciation forms
Public IEC-oriented electroacoustic annunciation family for comparing audible output marks.
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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