# Feeder busway Canonical URL: https://eloragrid.ai/symbols/busway-feeder-run Publisher: Elora Grid Updated: 2026-10-28 Lookup label: BD Drawing use: SLD, GA Reference families: IEC, IEEE / ANSI, Manufacturer A busway run used purely to carry power between two points, drawn as a distinct trunking line without tap-off points. ## In plain English ### What does Feeder busway mean? Feeder busway carries high current between a transformer and switchboard, or between switchboards, in an enclosed busbar trunking rather than parallel cables. Single-line diagrams draw it as a distinct line style or double line with its rating, so that it is not mistaken for cable. ### A simple example The symbol does not show the busway impedance, which is often lower than equivalent cables and affects fault level downstream. It also does not show the conductor arrangement, such as whether a full neutral or separate earth bar is included. Expansion units, fire barriers and flanged ends are physical details on the busway layout drawing. ### What the drawings help you do Read the busway rating and conductor arrangement. Use busway impedance, not cable data, for fault calculations. Feeder busway has no tap-off points; plug-in busway provides outlets along its length. ### This particular reference A busway run used purely to carry power between two points, drawn as a distinct trunking line without tap-off points. Feeder busway has no tap-off points; plug-in busway provides outlets along its length. ### Terms - Winding: A coil of conductor inside an electrical machine or transformer. - Rating: A value stating the conditions for which equipment is specified. - Schematic: A drawing showing function and connections rather than physical appearance. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Canalis busbar trunking systems](https://www.se.com/ww/en/work/products/master-ranges/line-series/) - [IEC-60617 symbol preview directory](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7871E6EF-24D5-467E-9B74-321FEDC9DFDA.htm) ## What it represents Feeder busway carries high current between a transformer and switchboard, or between switchboards, in an enclosed busbar trunking rather than parallel cables. Single-line diagrams draw it as a distinct line style or double line with its rating, so that it is not mistaken for cable. The symbol does not show the busway impedance, which is often lower than equivalent cables and affects fault level downstream. It also does not show the conductor arrangement, such as whether a full neutral or separate earth bar is included. Expansion units, fire barriers and flanged ends are physical details on the busway layout drawing. ## How to read it - Read the busway rating and conductor arrangement. - Use busway impedance, not cable data, for fault calculations. ## Information to show or reference - State current rating and conductor configuration. - Reference the busway layout drawing. - Include busway impedance in fault studies. ## Important distinction Feeder busway has no tap-off points; plug-in busway provides outlets along its length. ## Facts - Graphic cue: Double line or distinct trunking line between two boards - Typical use: Transformer to main switchboard links - Preview: Original educational illustration; consult the publisher and applicable standard for the exact graphic ## Public references - [Canalis busbar trunking systems](https://www.se.com/ww/en/work/products/master-ranges/line-series/) — Schneider Electric. Manufacturer busbar trunking ranges including feeder runs. - [IEC-60617 symbol preview directory](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7871E6EF-24D5-467E-9B74-321FEDC9DFDA.htm) — Autodesk. Public directory of IEC-oriented symbol families. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.