# Wall bushing primary interface Canonical URL: https://eloragrid.ai/symbols/wall-bushing-primary-interface Publisher: Elora Grid Updated: 2026-11-03 Lookup label: WBPI Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: switchyards Input: Primary conductor on one side Output: Primary conductor on the other side Identifies the insulated primary conductor passage through a building or compartment boundary. ## In plain English ### What this block does Identifies the insulated primary conductor passage through a building or compartment boundary. ### A simple example In a switchyard equipment diagram, the primary reference identifies the electrical role of an installed component while the linked equipment schedule and manufacturer drawing supply its exact construction and dimensions. For this reference, the drawing identifies “Primary conductor on one side” at the input and “Primary conductor on the other side” at the output. The physical barrier requires its own installation design. ### What the drawings help you do Start at the named input: Primary conductor on one side. Identify its source device or document and the state represented on the drawing. Follow the named output: Primary conductor on the other side. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Primary conductor on one side - Output: Primary conductor on the other side - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Primary conductor on one side → WBPI → Primary conductor on the other side A reading guide. The entry's original illustration and input/output facts describe this application. - [Gas-insulated switchgear](https://www.hitachienergy.com/products-and-solutions/high-voltage-switchgear-and-breakers/gas-insulated-switchgear) ## What it represents Identifies the insulated primary conductor passage through a building or compartment boundary. High-voltage primary equipment carries, interrupts, measures or conditions the main power circuit. Its function, insulation arrangement and equipment boundaries need to be distinguished from the secondary signals used to control it. In a switchyard equipment diagram, the primary reference identifies the electrical role of an installed component while the linked equipment schedule and manufacturer drawing supply its exact construction and dimensions. For this reference, the drawing identifies “Primary conductor on one side” at the input and “Primary conductor on the other side” at the output. The physical barrier requires its own installation design. Read the connected power path before interpreting a secondary output or alarm. These original educational component references provide no product dimensions, dielectric rating, installation clearance or construction approval. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation. ## How to read it - Start at the named input: Primary conductor on one side. Identify its source device or document and the state represented on the drawing. - Follow the named output: Primary conductor on the other side. Cross-reference its destination and separate the command from confirmation that the equipment responded. - The physical barrier requires its own installation design. - Read the connected power path before interpreting a secondary output or alarm. These original educational component references provide no product dimensions, dielectric rating, installation clearance or construction approval. ## Information to show or reference - Label the source and connection reference for primary conductor on one side. - Identify the destination and defined state of primary conductor on the other side. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: The physical barrier requires its own installation design. ## Important distinction The physical barrier requires its own installation design. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram. ## Facts - Representation: Functional block - Installation focus: Switchyards - Input / boundary: Primary conductor on one side - Output / connection: Primary conductor on the other side - Lookup label: WBPI is a library lookup label, not a standard device designation. ## Public references - [Gas-insulated switchgear](https://www.hitachienergy.com/products-and-solutions/high-voltage-switchgear-and-breakers/gas-insulated-switchgear) — Hitachi Energy. Public technical context for high-voltage primary equipment references. Primary switching equipment and instrument-transformer interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation. ## 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.