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-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

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

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