{"schemaVersion":1,"slug":"iec-neutral-link-open","name":"Neutral link, open","kind":"symbol","abbreviation":"N","aliases":["open neutral link","neutral link removed","neutral isolating link open"],"category":"connections-wiring","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A neutral link drawn removed or open, showing the neutral conductor disconnected at that point.","description":["The open neutral link shows the link withdrawn so that the neutral is disconnected. Drawings use it where a circuit is normally run with the neutral open, for example to isolate a spare or to segregate a neutral during a changeover, and on test procedures that show the link removed.","An open neutral on a live four-wire circuit can cause severe overvoltage on single-phase loads, so an open link in normal service needs a clear reason on the drawing. The symbol says nothing about the phase conductors, which may still be energised."],"readingNotes":["Ask why the neutral is shown open in service.","Check that phases are also isolated before working."],"drawingChecklist":["Note the reason the link is open.","Show phase isolation state alongside.","Label the link with its circuit number."],"distinction":"An open neutral link is disconnected; the closed form shows normal continuity.","facts":[{"label":"Graphic cue","value":"Fuse-carrier style link with the bridge missing"},{"label":"Publisher form","value":"Neutral Link - Open (HFU1NLO Autodesk identifier)"},{"label":"Preview","value":"Original educational illustration; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"autodesk-fuses","relevance":"Public IEC-oriented preview listing neutral link closed and open forms."},{"sourceId":"s28-eig-earthing-schemes","relevance":"Public installation-guide definitions of the neutral's role in earthing schemes."}],"related":["iec-neutral-link-closed","iec-neutral-conductor-mark","disconnect-terminal-block"],"artwork":"s28-iec-neutral-link-open","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Neutral link, open","reference":"Autodesk IEC-60617 Symbol Preview: Fuses (Neutral Link - Open); vendor family reference, not certified IEC geometry."},"plainEnglish":{"title":"What does Neutral link, open mean?","introduction":"The open neutral link shows the link withdrawn so that the neutral is disconnected. Drawings use it where a circuit is normally run with the neutral open, for example to isolate a spare or to segregate a neutral during a changeover, and on test procedures that show the link removed.","example":"An open neutral on a live four-wire circuit can cause severe overvoltage on single-phase loads, so an open link in normal service needs a clear reason on the drawing. The symbol says nothing about the phase conductors, which may still be supplied with operating power.","drawings":"Ask why the neutral is shown open in service. Check that phases are also isolated before working. An open neutral link is disconnected; the closed form shows normal continuity.","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":"Fuse and neutral-link symbols","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-E540AE83-CEE1-4CA9-B43C-B19004025EAA.htm"},{"label":"Definition of standardised earthing schemes","url":"https://www.electrical-installation.org/enwiki/Definition_of_standardised_earthing_schemes"}],"detail":"A neutral link drawn removed or open, showing the neutral conductor disconnected at that point. An open neutral link is disconnected; the closed form shows normal continuity.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-neutral-link-open","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-neutral-link-open.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-fuses","title":"Fuse and neutral-link symbols","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-E540AE83-CEE1-4CA9-B43C-B19004025EAA.htm","type":"cad-reference","scope":"Fuses, auxiliary contacts, indication and open/closed neutral-link variants.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public IEC-oriented preview listing neutral link closed and open forms."},{"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 the neutral's role in earthing schemes."}]}