{"schemaVersion":1,"slug":"iec-presence-detector-lighting","name":"Lighting presence detector plan mark","kind":"symbol","abbreviation":"PIR-L","aliases":["occupancy sensor","lighting motion sensor","presence/absence detector"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Plan mark for a ceiling or wall sensor that switches lighting automatically according to occupancy.","description":["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.","The plan should also show whether the detector operates in presence mode (automatic on and off) or absence mode (manual on, automatic off) and whether it includes a daylight sensor. These settings strongly affect energy performance and are often stated in a lighting control schedule.","This lighting sensor is distinct from an intruder alarm motion detector even when the sensing principle is the same. The two belong to different systems with different wiring and standards."],"readingNotes":["Check the coverage pattern against the room geometry.","Confirm whether the sensor controls a switching relay, a DALI group or a local load directly."],"drawingChecklist":["State presence or absence mode.","Show coverage radius.","Link the controlled luminaire groups."],"distinction":"An intruder motion detector reports to an alarm panel; a lighting presence detector controls luminaires.","facts":[{"label":"Sensing","value":"Passive infrared, microwave or dual technology"},{"label":"System","value":"Lighting control, not security"},{"label":"Exact standard graphic","value":"Not reproduced here; confirm the form against IEC 60617 and the project legend"}],"references":[{"sourceId":"iec-diagrams","relevance":"IEC graphical symbol context; independently drawn here."},{"sourceId":"iec-public-radiation","relevance":"Public IEC-oriented radiation qualifiers relevant to infrared sensing marks."}],"related":["iec-intruder-motion-detector","iec-luminaire-general-plan-symbol","iec-photoelectric-light-switch"],"artwork":"s28-iec-presence-detector-lighting","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Presence detector for lighting","reference":"IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier."},"plainEnglish":{"title":"What does Lighting presence detector plan mark mean?","introduction":"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.","example":"The plan should also show whether the detector operates in presence mode (automatic on and off) or absence mode (manual on, automatic off) and whether it includes a daylight sensor. These settings strongly affect energy performance and are often stated in a lighting control schedule.","drawings":"This lighting sensor is distinct from an intruder alarm motion detector even when the sensing principle is the same. The two belong to different systems with different wiring and standards.","terms":[{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"IEC graphical symbols for diagrams","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/"},{"label":"Autodesk IEC-60617 preview: Radiation qualifiers","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EABC81B4-549D-49C9-A0F5-086DD204A689.htm"}],"detail":"Plan mark for a ceiling or wall sensor that switches lighting automatically according to occupancy. An intruder motion detector reports to an alarm panel; a lighting presence detector controls luminaires.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-presence-detector-lighting","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-presence-detector-lighting.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"iec-diagrams","title":"IEC graphical symbols for diagrams","publisher":"IEC","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/","type":"standard","scope":"IEC 60617 and related symbol-design publications. Full database access requires a subscription.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"IEC graphical symbol context; independently drawn here."},{"id":"iec-public-radiation","title":"Autodesk IEC-60617 preview: Radiation qualifiers","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EABC81B4-549D-49C9-A0F5-086DD204A689.htm","type":"cad-reference","scope":"Public publisher IEC-context family names and vendor block references. No vendor images or CAD library files are reproduced, and vendor tokens are not presented as verified IEC database identifiers.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEC-oriented radiation qualifiers relevant to infrared sensing marks."}]}