{"schemaVersion":1,"slug":"busway-tap-off-point","name":"Busway tap-off connection","kind":"symbol","abbreviation":"TO","aliases":["plug-in tap","busway outlet connection","tap-off unit connection"],"category":"connections-wiring","drawingTypes":["SLD"],"referenceFamilies":["IEC","IEEE / ANSI","Manufacturer"],"summary":"The connection of an outgoing circuit to a plug-in busway through a tap-off unit, usually containing a protective device.","description":["This symbol shows a tap-off unit plugged into the busway, with the outgoing circuit leaving through a fuse or circuit breaker in the unit. On single-line diagrams it replaces the board-and-feeder pattern used for switchboards, since the busway itself acts as the distribution bus.","The connection symbol does not show the tap-off unit rating unless annotated. Tap-off units may be fused or contain a breaker, and they usually have an interlock preventing insertion or removal under load. The protective device inside the unit should be drawn with its own symbol and rating."],"readingNotes":["Read the protective device rating in the tap-off unit.","Check selectivity between the tap-off device and busway upstream protection."],"drawingChecklist":["Draw the protective device in the tap-off.","State tap-off rating.","Identify the busway outlet position."],"distinction":"A busway tap-off is a plug-in connection with its own protection; a one-line bus tap is a generic connection to a busbar.","facts":[{"label":"Graphic cue","value":"Short branch from busway line into a protective device"},{"label":"Physical item","value":"Plug-in tap-off unit"},{"label":"Preview","value":"Original educational illustration; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"busbar-trunking","relevance":"Manufacturer busbar trunking ranges with tap-off units."},{"sourceId":"iec-public-one-bus","relevance":"Public IEC-oriented one-line bus-tap representation for comparison."}],"related":["plug-in-busway","iec-one-line-bus-tap","ga-busway-tap-off-unit"],"artwork":"s28-busway-tap-off-point","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","plainEnglish":{"title":"What does Busway tap-off connection mean?","introduction":"This symbol shows a tap-off unit plugged into the busway, with the outgoing circuit leaving through a fuse or circuit breaker in the unit. On single-line diagrams it replaces the board-and-feeder pattern used for switchboards, since the busway itself acts as the distribution bus.","example":"The connection symbol does not show the tap-off unit rating unless annotated. Tap-off units may be fused or contain a breaker, and they usually have an interlock preventing insertion or removal under load. The protective device inside the unit should be drawn with its own symbol and rating.","drawings":"Read the protective device rating in the tap-off unit. Check selectivity between the tap-off device and busway upstream protection. A busway tap-off is a plug-in connection with its own protection; a one-line bus tap is a generic connection to a busbar.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"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":"Canalis busbar trunking systems","url":"https://www.se.com/ww/en/work/products/master-ranges/line-series/"},{"label":"Autodesk IEC-60617 preview: One-line bus-tap representation","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-9EC851F1-8B92-428B-A657-5B21B2325C62.htm"}],"detail":"The connection of an outgoing circuit to a plug-in busway through a tap-off unit, usually containing a protective device. A busway tap-off is a plug-in connection with its own protection; a one-line bus tap is a generic connection to a busbar.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/busway-tap-off-point","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/busway-tap-off-point.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"busbar-trunking","title":"Canalis busbar trunking systems","publisher":"Schneider Electric","url":"https://www.se.com/ww/en/work/products/master-ranges/line-series/","type":"manufacturer","scope":"Public transport and distribution applications for busbar trunking. Select the exact system before using its dimensions.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Manufacturer busbar trunking ranges with tap-off units."},{"id":"iec-public-one-bus","title":"Autodesk IEC-60617 preview: One-line bus-tap representation","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-9EC851F1-8B92-428B-A657-5B21B2325C62.htm","type":"cad-reference","scope":"Public publisher IEC-context family names and vendor block references. No vendor images or CAD library files are reproduced, and vendor tokens are not presented as verified IEC database identifiers.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEC-oriented one-line bus-tap representation for comparison."}]}