# Ground-and-test device indication Canonical URL: https://eloragrid.ai/symbols/ground-and-test-device-indication Publisher: Elora Grid Updated: 2026-11-03 Lookup label: GDI Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: switchgear Input: Test-device position Output: Device-present status Identifies the documented test-device insertion and position information at a switchgear compartment. ## In plain English ### What this block does Identifies the documented test-device insertion and position information at a switchgear compartment. ### A simple example In a switchgear relay panel, test links can separate a protective relay from the trip coils while maintaining the specified current-transformer secondary arrangement. For this reference, the drawing identifies “Test-device position” at the input and “Device-present status” at the output. The device function follows its manufacturer instructions. ### What the drawings help you do Start at the named input: Test-device position. Identify its source device or document and the state represented on the drawing. Follow the named output: Device-present status. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Test-device position - Output: Device-present status - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Test-device position → GDI → Device-present status A reading guide. The entry's original illustration and input/output facts describe this application. - [Masterclad medium-voltage switchgear: circuit-breaker section interlocks](https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7) ## What it represents Identifies the documented test-device insertion and position information at a switchgear compartment. A test interface separates measurement, command and indication paths so their behavior can be checked in the documented test configuration. The test boundary must show which real equipment outputs remain enabled. In a switchgear relay panel, test links can separate a protective relay from the trip coils while maintaining the specified current-transformer secondary arrangement. For this reference, the drawing identifies “Test-device position” at the input and “Device-present status” at the output. The device function follows its manufacturer instructions. Trace the source and destination on each side of the test boundary. Use the selected test-device instructions for actual operations and never infer a safe current-transformer switching sequence from an educational diagram. 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: Test-device position. Identify its source device or document and the state represented on the drawing. - Follow the named output: Device-present status. Cross-reference its destination and separate the command from confirmation that the equipment responded. - The device function follows its manufacturer instructions. - Trace the source and destination on each side of the test boundary. Use the selected test-device instructions for actual operations and never infer a safe current-transformer switching sequence from an educational diagram. ## Information to show or reference - Label the source and connection reference for test-device position. - Identify the destination and defined state of device-present status. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: The device function follows its manufacturer instructions. ## Important distinction The device function follows its manufacturer instructions. 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: Switchgear - Input / boundary: Test-device position - Output / connection: Device-present status - Lookup label: GDI is a library lookup label, not a standard device designation. ## Public references - [Masterclad medium-voltage switchgear: circuit-breaker section interlocks](https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7) — Schneider Electric. Public technical context for switchgear test and commissioning interfaces. Breaker control, mechanism, position contacts, racking interlocks and test 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.