{"schemaVersion":1,"slug":"iec-one-way-light-switch","name":"One-way light switch plan mark","kind":"symbol","abbreviation":"S1","aliases":["single-pole one-way switch","one-way switch plan symbol","light switch"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Installation plan mark for a single-pole one-way switch that turns a lighting circuit on and off from one place.","description":["The one-way switch is drawn on IEC-style plans as a small circle at the switch position with a short stroke ending in one tick. A dashed or curved switching line usually runs from the symbol to the luminaires it controls, telling the electrician which lights are switched together.","Gang count is shown by repeating the switch or by writing a number beside it, so a two-gang plate controlling two lighting groups appears as two strokes or a 2. Mounting height is normally covered by a general note rather than on each symbol.","The symbol shows a switching function and position only. It does not show the rating, the plate finish or whether the switch is single-pole or double-pole beyond the single tick convention."],"readingNotes":["Follow the switching line to the luminaires; the symbol alone does not say what it controls.","Count ticks: one tick for single-pole one-way, two ticks for double-pole."],"drawingChecklist":["Draw switching links to every controlled luminaire.","Indicate gang count where switches share a plate.","Reference mounting height in the general notes."],"distinction":"A two-way switch has a second stroke so it can be paired with another switch; the one-way form controls from one point only.","facts":[{"label":"Graphic cue","value":"Circle with one stroke and one end tick"},{"label":"Paired information","value":"Switching line to controlled luminaires"},{"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 diagrams; not a source of reproduced artwork."},{"sourceId":"switching-devices","relevance":"Functional switching explained separately from isolation and protection."}],"related":["iec-two-way-light-switch","iec-two-pole-light-switch","iec-luminaire-general-plan-symbol"],"artwork":"s28-iec-one-way-light-switch","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"One-way switch, single pole","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 One-way light switch plan mark mean?","introduction":"The one-way switch is drawn on IEC-style plans as a small circle at the switch position with a short stroke ending in one tick. A dashed or curved switching line usually runs from the symbol to the luminaires it controls, telling the electrician which lights are switched together.","example":"Gang count is shown by repeating the switch or by writing a number beside it, so a two-gang plate controlling two lighting groups appears as two strokes or a 2. Mounting height is normally covered by a general note rather than on each symbol.","drawings":"The symbol shows a switching function and position only. It does not show the rating, the plate finish or whether the switch is single-pole or double-pole beyond the single tick convention.","terms":[{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"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":"Elementary switching devices","url":"https://www.electrical-installation.org/enwiki/Elementary_switching_devices"}],"detail":"Installation plan mark for a single-pole one-way switch that turns a lighting circuit on and off from one place. A two-way switch has a second stroke so it can be paired with another switch; the one-way form controls from one point only.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-one-way-light-switch","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-one-way-light-switch.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 diagrams; not a source of reproduced artwork."},{"id":"switching-devices","title":"Elementary switching devices","publisher":"Schneider Electric — Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/Elementary_switching_devices","type":"manufacturer","scope":"Explains disconnectors, load-break switches, contactors and fuses. The manufacturer diagrams remain at the source.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Functional switching explained separately from isolation and protection."}]}