{"schemaVersion":1,"slug":"iec-door-contact-plan-symbol","name":"Door contact plan symbol","kind":"symbol","abbreviation":"DC","aliases":["magnetic reed contact","door position switch","intruder door contact"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Security plan symbol for a magnetic contact that signals whether a door or window is open.","description":["Magnetic door contacts use a reed switch on the frame and a magnet on the door. Security plans draw a small pair of rectangles or a contact mark at the door head, tagged DC, with the zone number.","Door contacts are used both for intruder alarm and for access control door monitoring, where they detect forced or held-open doors. The plan should state which system or both. The symbol does not tell you whether the contact is surface or flush, or high-security balanced type."],"readingNotes":["Check which system receives the signal.","Check surface or flush type in schedule."],"drawingChecklist":["Tag zone or door number.","State contact type.","Coordinate with door hardware."],"distinction":"A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.","facts":[{"label":"Operating principle","value":"Reed switch and magnet"},{"label":"Systems","value":"Intruder alarm and access control"},{"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 for installation and communication plans; independently drawn here."},{"sourceId":"pub-object-engineering-design","relevance":"Installation design context for coordinating low-current systems with power and lighting."}],"related":["iec-intruder-motion-detector","magnetic-proximity-switch","iec-magnetic-door-holder-plan-symbol"],"artwork":"s28-iec-door-contact-plan-symbol","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Door contact","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 Door contact plan mean?","introduction":"Magnetic door contacts use a reed switch on the frame and a magnet on the door. Security plans draw a small pair of rectangles or a contact mark at the door head, tagged DC, with the zone number.","example":"Door contacts are used both for intruder alarm and for access control door monitoring, where they detect forced or held-open doors. The plan should state which system or both. The symbol does not tell you whether the contact is surface or flush, or high-security balanced type.","drawings":"Check which system receives the signal. Check surface or flush type in schedule. A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.","terms":[{"name":"DC","meaning":"Direct current: electricity flowing in one direction."},{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"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":"Electrical installation design methodology and references","url":"https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design"}],"detail":"Security plan symbol for a magnetic contact that signals whether a door or window is open. A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-door-contact-plan-symbol","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-door-contact-plan-symbol.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 for installation and communication plans; independently drawn here."},{"id":"pub-object-engineering-design","title":"Electrical installation design methodology and references","publisher":"Schneider Electric — Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design","type":"manufacturer","scope":"Public design context. No universal working clearance, equipment dimension or project compliance conclusion is asserted.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Installation design context for coordinating low-current systems with power and lighting."}]}