{"schemaVersion":1,"slug":"ansi-neutral-link-closed","name":"ANSI/IEEE Neutral link, closed form","kind":"symbol","abbreviation":"N","aliases":["HFU1NLC","VFU1NLC","IEEE Neutral Link - Closed","ANSI Neutral link, closed"],"category":"connections-wiring","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of neutral link, closed: a removable link in the neutral conductor shown in its closed position, allowing the neutral to be opened for testing.","description":["This reference locates neutral link, closed in Autodesk's IEEE-oriented fuses family. 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 public library uses HFU1NLC for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Use the surrounding circuit labels and the project legend to identify the intended operating condition and connection. Carry the same device reference into the schedule or equipment document so the symbol can be reconciled with its real terminals, function and operating limits.","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. Do not read the holder as a fuse. A closed neutral link is a removable connection; a neutral fuse would be a protective device and is generally not permitted. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"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":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Fuses; published form: Neutral Link - Closed."},{"label":"Public vendor block","value":"HFU1NLC. Vendor library token, not an IEEE symbol number."},{"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"},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-5cf1e8f7-6883-4c9b-9bb3-6cd1a9339ae5","relevance":"Public IEEE-oriented Fuses table explicitly lists HFU1NLC as Neutral Link - Closed. This supports the vendor convention context, not reproduction of the publisher graphic."},{"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-link-open","iec-neutral-conductor-mark","fuse"],"artwork":"s28-ansi-neutral-link-closed","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Neutral Link - Closed","reference":"Autodesk IEEE Symbol Preview: Fuses, block HFU1NLC. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-neutral-link-closed"},"plainEnglish":{"title":"What does ANSI/IEEE Neutral link, closed form mean?","introduction":"This reference locates neutral link, closed in Autodesk's IEEE-oriented fuses family. 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 public library uses HFU1NLC for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Use the surrounding circuit labels and the project legend to identify the intended operating condition and connection. Carry the same device reference into the schedule or equipment document so the symbol can be reconciled with its real terminals, function and operating limits.","drawings":"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. Do not read the holder as a fuse. A closed neutral link is a removable connection; a neutral fuse would be a protective device and is generally not permitted. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","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":"Autodesk IEEE Symbol Preview — Fuses","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-5CF1E8F7-6883-4C9B-9BB3-6CD1A9339AE5.htm"},{"label":"Definition of standardised earthing schemes","url":"https://www.electrical-installation.org/enwiki/Definition_of_standardised_earthing_schemes"}],"detail":"IEEE-library form of neutral link, closed: 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/ansi-neutral-link-closed","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-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":"ansi-autodesk-5cf1e8f7-6883-4c9b-9bb3-6cd1a9339ae5","title":"Autodesk IEEE Symbol Preview — Fuses","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-5CF1E8F7-6883-4C9B-9BB3-6CD1A9339AE5.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Fuses table explicitly lists HFU1NLC as Neutral Link - Closed. This supports the vendor convention context, not reproduction of the publisher graphic."},{"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."}]}