{"schemaVersion":1,"slug":"iec-two-pole-light-switch","name":"Two-pole one-way switch plan mark","kind":"symbol","abbreviation":"S2P","aliases":["double-pole switch plan mark","DP switch","two-pole switch"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Plan mark for a one-way switch that breaks both line and neutral, drawn with two ticks on the stroke.","description":["A two-pole one-way switch opens both poles of a single-phase circuit. The IEC plan convention adds a second tick to the one-way switch stroke, giving the reader an immediate visual cue that the switch interrupts both conductors.","Two-pole switches are specified for outdoor lighting, appliances where both poles must be broken, and some heating loads. They are also used where a switch is expected to provide functional disconnection of a fixed appliance without a separate isolator.","Two ticks do not mean the switch meets isolation requirements for maintenance. Where isolation is needed, the designer should show an isolator mark or state the isolating rating."],"readingNotes":["Count the ticks carefully when the drawing is reduced in size.","Check whether a separate isolator is also shown for the same load."],"drawingChecklist":["State whether isolation duty is intended.","Tag the controlled load.","Confirm current rating for heating or appliance loads."],"distinction":"The single-tick one-way switch breaks one pole only; the two-tick form breaks both.","facts":[{"label":"Graphic cue","value":"Two ticks on the switch stroke"},{"label":"Typical uses","value":"Heaters, outdoor lighting, appliance 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; independently drawn here."},{"sourceId":"switching-devices","relevance":"Distinguishes functional switching and isolation duties."}],"related":["iec-one-way-light-switch","iec-local-isolator-plan-mark","two-pole-power-switch"],"artwork":"s28-iec-two-pole-light-switch","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"One-way switch, two 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 Two-pole one-way switch plan mark mean?","introduction":"A two-pole one-way switch opens both poles of a single-phase circuit. The IEC plan convention adds a second tick to the one-way switch stroke, giving the reader an immediate visual cue that the switch interrupts both conductors.","example":"Two-pole switches are specified for outdoor lighting, appliances where both poles must be broken, and some heating loads. They are also used where a switch is expected to provide functional disconnection of a fixed appliance without a separate isolator.","drawings":"Two ticks do not mean the switch meets isolation requirements for maintenance. Where isolation is needed, the designer should show an isolator mark or state the isolating rating.","terms":[{"name":"Phase","meaning":"One of the related AC waveforms in a power system."},{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."}],"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":"Plan mark for a one-way switch that breaks both line and neutral, drawn with two ticks on the stroke. The single-tick one-way switch breaks one pole only; the two-tick form breaks both.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-two-pole-light-switch","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-two-pole-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; independently drawn here."},{"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":"Distinguishes functional switching and isolation duties."}]}