# Intruder motion detector plan symbol

Canonical URL: https://eloragrid.ai/symbols/iec-intruder-motion-detector
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: PIR
Drawing use: GA
Reference families: IEC

## Symbol convention

Convention: IEC
Form: Motion detector, intruder alarm
IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

Security plan symbol for a passive infrared or dual-technology motion detector reporting to an intruder alarm.

## In plain English

### What does Intruder motion detector plan mean?

Intruder motion detectors sense movement, usually by passive infrared, sometimes combined with microwave. Security plans draw a small box or semicircle at the corner mounting position with the detection fan drawn into the room so coverage can be checked.

### A simple example

Each detector is wired to an alarm panel zone or an addressable bus, and the plan tags its zone. Detectors must not see heaters, moving curtains or direct sunlight, so the fan on the plan is a practical design check. The symbol does not state pet immunity, technology or masking detection. The security schedule records these.

### What the drawings help you do

Check the coverage fan against windows and heat sources. Read the zone tag. A lighting presence detector switches luminaires; this detector reports to an intruder alarm system.

### This particular reference

Security plan symbol for a passive infrared or dual-technology motion detector reporting to an intruder alarm. A lighting presence detector switches luminaires; this detector reports to an intruder alarm system.

### Terms

- Terminal: An identified point where a conductor connects.
- 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.

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)
- [Autodesk IEC-60617 preview: Radiation qualifiers](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EABC81B4-549D-49C9-A0F5-086DD204A689.htm)
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design)


## What it represents

Intruder motion detectors sense movement, usually by passive infrared, sometimes combined with microwave. Security plans draw a small box or semicircle at the corner mounting position with the detection fan drawn into the room so coverage can be checked.
Each detector is wired to an alarm panel zone or an addressable bus, and the plan tags its zone. Detectors must not see heaters, moving curtains or direct sunlight, so the fan on the plan is a practical design check. The symbol does not state pet immunity, technology or masking detection. The security schedule records these.

## How to read it

- Check the coverage fan against windows and heat sources.
- Read the zone tag.

## Information to show or reference

- Show coverage fan.
- Tag zone.
- State detector technology.

## Important distinction

A lighting presence detector switches luminaires; this detector reports to an intruder alarm system.

## Facts

- Sensing: Passive infrared, sometimes with microwave
- System: Intruder alarm
- Exact standard graphic: Not reproduced here; confirm the form against IEC 60617 and the project legend

## Public references

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC graphical symbol context for installation and communication plans; independently drawn here.
- [Autodesk IEC-60617 preview: Radiation qualifiers](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EABC81B4-549D-49C9-A0F5-086DD204A689.htm) — Autodesk. Public IEC-oriented radiation qualifiers relevant to infrared and optical marks.
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design) — Schneider Electric — Electrical Installation Guide. Installation design context for coordinating low-current systems with power and lighting.

## 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.