{"schemaVersion":1,"slug":"iec-switch-with-pilot-light","name":"Switch with pilot light plan mark","kind":"symbol","abbreviation":"SPL","aliases":["illuminated switch","switch with indicator","pilot-light switch"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Plan mark for a switch with an integral pilot lamp that shows when the controlled load is on.","description":["A switch with pilot light is used where the controlled load cannot be seen from the switch position, such as an external light, a water heater or a loft. The plan form adds a small lamp mark, a crossed circle, to the switch symbol.","The pilot lamp needs a neutral at the switch in many accessory designs, so the symbol tells the electrician to bring a neutral to the switch box. It may also signal a double-pole switch for appliance control.","The lamp mark does not tell you whether it lights when the load is on or when the switch is off as a locator. The specification decides."],"readingNotes":["Check whether the lamp indicates load on or acts as a locator.","Confirm a neutral is available at the switch."],"drawingChecklist":["State lamp function.","State pole count.","Tag the remote load."],"distinction":"A plain one-way switch has no lamp; this form adds visual confirmation of the load state.","facts":[{"label":"Added element","value":"Integral indicator lamp"},{"label":"Wiring note","value":"Often needs a neutral at the switch"},{"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":"autodesk-lamps","relevance":"Public lamp symbol family for comparing the indicator element."}],"related":["iec-one-way-light-switch","indicator-lamp"],"artwork":"s28-iec-switch-with-pilot-light","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Switch with pilot lamp","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 Switch with pilot light plan mark mean?","introduction":"A switch with pilot light is used where the controlled load cannot be seen from the switch position, such as an external light, a water heater or a loft. The plan form adds a small lamp mark, a crossed circle, to the switch symbol.","example":"The pilot lamp needs a neutral at the switch in many accessory designs, so the symbol tells the electrician to bring a neutral to the switch box. It may also signal a double-pole switch for appliance control.","drawings":"The lamp mark does not tell you whether it lights when the load is on or when the switch is off as a locator. The specification decides.","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":"Pilot lights: public symbol reference","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-BBCEBBBA-24AD-4D3A-B106-39550AAACA6C.htm"}],"detail":"Plan mark for a switch with an integral pilot lamp that shows when the controlled load is on. A plain one-way switch has no lamp; this form adds visual confirmation of the load state.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-switch-with-pilot-light","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-switch-with-pilot-light.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":"autodesk-lamps","title":"Pilot lights: public symbol reference","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-BBCEBBBA-24AD-4D3A-B106-39550AAACA6C.htm","type":"cad-reference","scope":"Pilot-light and indication variants. A symbol alone does not establish the indicated operating condition.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public lamp symbol family for comparing the indicator element."}]}