SVAD
Combined sounder and visual alarm device plan symbol
Plan symbol for a fire alarm device combining an audible sounder with a flashing visual alarm.
IEC
IEEE / ANSI · HS
ANSI fire alarm horn-strobe plan symbol
US-style plan symbol for a combined horn and strobe notification appliance, with a candela tag.
In plain English
What does ANSI fire alarm horn-strobe plan mean?
US fire alarm plans draw horn-strobes with a symbol combining a horn and a strobe mark, tagged with the strobe candela rating such as 15, 75 or 110 cd. The candela value is chosen from room size and mounting.
A simple example
Notification appliance circuits are shown by circuit labels, and synchronisation of strobes in the same field of view must be ensured. The plan symbol therefore usually includes circuit tags. The symbol does not show horn tone pattern; the temporal pattern is set by the system.
What the drawings help you do
Read candela rating. Check synchronisation for multiple strobes. A strobe-only appliance has no horn; the horn-strobe gives both.
This particular reference
US-style plan symbol for a combined horn and strobe notification appliance, with a candela tag. A strobe-only appliance has no horn; the horn-strobe gives both.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams · Autodesk IEC-60617 preview: Electroacoustic annunciation forms
IEEE / ANSI · Horn-strobe notification appliance
US architectural electrical plan practice in the ANSI Y32.9 lineage, read alongside IEEE 315 context; independently drawn, not a certified IEEE or ANSI graphic.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
GA · HS
What it represents
US fire alarm plans draw horn-strobes with a symbol combining a horn and a strobe mark, tagged with the strobe candela rating such as 15, 75 or 110 cd. The candela value is chosen from room size and mounting.
Notification appliance circuits are shown by circuit labels, and synchronisation of strobes in the same field of view must be ensured. The plan symbol therefore usually includes circuit tags. The symbol does not show horn tone pattern; the temporal pattern is set by the system.
How to read it
- Read candela rating.
- Check synchronisation for multiple strobes.
Information to show or reference
- Tag candela.
- Tag notification circuit.
- Give mounting height.
A distinction that matters
A strobe-only appliance has no horn; the horn-strobe gives both.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Graphic-symbol standards context and official status; not a source of reproduced artwork.
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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