{"schemaVersion":1,"slug":"iec-neutral-link-closed","name":"Neutral link, closed","kind":"symbol","abbreviation":"N","aliases":["closed neutral link","neutral isolating link closed","neutral bar link"],"category":"connections-wiring","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A removable link in the neutral conductor shown in its closed position, allowing the neutral to be opened for testing.","description":["A neutral link is a bolted or plug-in link in the neutral conductor, often mounted in a fuse carrier style holder alongside phase fuses. It allows the neutral of a circuit to be disconnected for insulation testing or fault finding without disturbing other circuits on the neutral bar. The closed form shows its normal service state.","The symbol is not a switch and the link should not be opened under load. It does not provide overcurrent protection; the fuse-like holder can mislead readers into treating it as a neutral fuse. Rules on whether the neutral may be separately disconnected differ between earthing schemes."],"readingNotes":["Do not read the holder as a fuse.","Confirm the link is opened only with the circuit isolated."],"drawingChecklist":["Label the link with its circuit number.","Show it in its normal closed state.","Check scheme rules for neutral disconnection."],"distinction":"A closed neutral link is a removable connection; a neutral fuse would be a protective device and is generally not permitted.","facts":[{"label":"Graphic cue","value":"Fuse-carrier style link drawn bridged"},{"label":"Publisher form","value":"Neutral Link - Closed (HFU1NLC 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-open","iec-neutral-conductor-mark","fuse"],"artwork":"s28-iec-neutral-link-closed","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Neutral link, closed","reference":"Autodesk IEC-60617 Symbol Preview: Fuses (Neutral Link - Closed); vendor family reference, not certified IEC geometry."},"plainEnglish":{"title":"What does Neutral link, closed mean?","introduction":"A neutral link is a bolted or plug-in link in the neutral conductor, often mounted in a fuse carrier style holder alongside phase fuses. It allows the neutral of a circuit to be disconnected for insulation testing or fault finding without disturbing other circuits on the neutral bar. The closed form shows its normal service state.","example":"The symbol is not a switch and the link should not be opened under load. It does not provide overcurrent protection; the fuse-like holder can mislead readers into treating it as a neutral fuse. Rules on whether the neutral may be separately disconnected differ between earthing schemes.","drawings":"Do not read the holder as a fuse. Confirm the link is opened only with the circuit isolated. A closed neutral link is a removable connection; a neutral fuse would be a protective device and is generally not permitted.","terms":[{"name":"Phase","meaning":"One of the related AC waveforms in a power system."},{"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":"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 removable link in the neutral conductor shown in its closed position, allowing the neutral to be opened for testing. A closed neutral link is a removable connection; a neutral fuse would be a protective device and is generally not permitted.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-neutral-link-closed","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-neutral-link-closed.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."}]}