# ANSI fire alarm horn-strobe plan symbol

Canonical URL: https://eloragrid.ai/symbols/ansi-fire-alarm-horn-strobe
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: HS
Drawing use: GA
Reference families: IEEE / ANSI

## Symbol convention

Convention: IEEE / ANSI
Form: 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.

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.

### Terms

- Rating: A value stating the conditions for which equipment is specified.
- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/)
- [Autodesk IEC-60617 preview: Electroacoustic annunciation forms](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-4602FA60-BECA-4C77-A435-73C8C05E41F7.htm)


## 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.

## Important distinction

A strobe-only appliance has no horn; the horn-strobe gives both.

## Facts

- Key tag: Candela rating
- Outputs: Horn plus strobe
- Artwork scope: Original educational illustration; the exact ANSI or IEEE graphic and compliance are not certified

## Public references

- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context and official status; not a source of reproduced artwork.
- [Autodesk IEC-60617 preview: Electroacoustic annunciation forms](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-4602FA60-BECA-4C77-A435-73C8C05E41F7.htm) — Autodesk. Public IEC-oriented electroacoustic annunciation family for comparing audible output marks.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.