Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

PIR

IEC

Intruder motion detector plan symbol

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.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Motion detector, intruder alarm. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

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

Full reference

PIR-L

IEC

Lighting presence detector plan mark

Lighting presence detectors switch or dim luminaires according to occupancy, usually by passive infrared or microwave sensing. Plans show a small circle or square with a detection mark, often with the coverage radius drawn so designers can check the area is covered.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Presence detector for lighting. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

An intruder motion detector reports to an alarm panel; a lighting presence detector controls luminaires.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.