{"schemaVersion":1,"slug":"iec-three-phase-five-wire-marking","name":"Three-phase circuit with neutral and PE marking","kind":"symbol","abbreviation":"3/N/PE","aliases":["3N PE notation","five-wire circuit mark","L1 L2 L3 N PE notation"],"category":"connections-wiring","drawingTypes":["SLD"],"referenceFamilies":["IEC"],"summary":"A single-line notation such as 3/N/PE showing a three-phase circuit carrying both a neutral and a separate protective conductor.","description":["Single-line diagrams often state the conductor complement of a circuit with a short notation beside the line, for example 3/N/PE 400/230 V 50 Hz. This tells the reader at a glance that the circuit has three phases, a neutral and a separate protective conductor, which is the normal TN-S final distribution arrangement.","The notation is a statement about which conductors exist, not their sizes. It also does not confirm that the downstream equipment uses the neutral. Changes in the notation along a feeder, for example from 3/PEN to 3/N/PE, mark the point where a PEN conductor has been split."],"readingNotes":["Watch for a change in notation along a feeder that marks a PEN split.","Read voltage and frequency that may follow the conductor notation."],"drawingChecklist":["State the conductor complement on each distribution feeder.","Include voltage and frequency where the notation is used.","Keep notation consistent with the cable schedule."],"distinction":"The 3/N/PE notation states a whole conductor complement; individual N, PE or PEN marks identify one conductor on a stroke.","facts":[{"label":"Typical text","value":"3/N/PE 400/230 V 50 Hz"},{"label":"Scheme context","value":"TN-S distribution"},{"label":"Preview","value":"Original educational illustration; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"s28-eig-earthing-schemes","relevance":"Public installation-guide definitions of earthing schemes."},{"sourceId":"autodesk-index","relevance":"Public directory of IEC-oriented symbol families."}],"related":["iec-neutral-conductor-mark","iec-protective-conductor-mark","conductor-count-numeral"],"artwork":"s28-iec-three-phase-five-wire-marking","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Conductor complement notation on a single line","reference":"Independent IEC-context illustration; not certified IEC geometry."},"plainEnglish":{"title":"What does Three-phase circuit with neutral and PE marking mean?","introduction":"Single-line diagrams often state the conductor complement of a circuit with a short notation beside the line, for example 3/N/PE 400/230 V 50 Hz. This tells the reader at a glance that the circuit has three phases, a neutral and a separate protective conductor, which is the normal TN-S final distribution arrangement.","example":"The notation is a statement about which conductors exist, not their sizes. It also does not confirm that the downstream equipment uses the neutral. Changes in the notation along a feeder, for example from 3/PEN to 3/N/PE, mark the point where a PEN conductor has been split.","drawings":"Watch for a change in notation along a feeder that marks a PEN split. Read voltage and frequency that may follow the conductor notation. The 3/N/PE notation states a whole conductor complement; individual N, PE or PEN marks identify one conductor on a stroke.","terms":[{"name":"Phase","meaning":"One of the related AC waveforms in a power system."},{"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":"Definition of standardised earthing schemes","url":"https://www.electrical-installation.org/enwiki/Definition_of_standardised_earthing_schemes"},{"label":"IEC-60617 symbol preview directory","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7871E6EF-24D5-467E-9B74-321FEDC9DFDA.htm"}],"detail":"A single-line notation such as 3/N/PE showing a three-phase circuit carrying both a neutral and a separate protective conductor. The 3/N/PE notation states a whole conductor complement; individual N, PE or PEN marks identify one conductor on a stroke.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-three-phase-five-wire-marking","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-three-phase-five-wire-marking.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"s28-eig-earthing-schemes","title":"Definition of standardised earthing schemes","publisher":"Schneider Electric, Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/Definition_of_standardised_earthing_schemes","type":"manufacturer","scope":"TT, TN (including TN-C and TN-C-S with PEN conductors) and IT system earthing arrangements.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Public installation-guide definitions of earthing schemes."},{"id":"autodesk-index","title":"IEC-60617 symbol preview directory","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7871E6EF-24D5-467E-9B74-321FEDC9DFDA.htm","type":"cad-reference","scope":"Public reference directory of named symbol categories. Vendor graphics and CAD library files are not redistributed here.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public directory of IEC-oriented symbol families."}]}