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Grounding and Bonding Flashcards

7 cards from real DCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What does TMGB stand for in telecommunications grounding terminology?

    Answer: Telecommunications Main Grounding Busbar

    TMGB stands for Telecommunications Main Grounding Busbar, which is the primary grounding reference point for the entire telecommunications grounding system.

  2. How should equipment racks and cabinets be properly bonded in a telecommunications room?

    Answer: Connected to the TGB using an equipment bonding conductor (EBC)

    Equipment racks and cabinets must be bonded to the Telecommunications Grounding Busbar (TGB) using an equipment bonding conductor (EBC) to create a common reference point.

  3. According to ANSI/TIA-607, what are the minimum dimensions specified for a Telecommunications Grounding Busbar (TGB)?

    Answer: 6mm thick, 50mm wide copper bar

    ANSI/TIA-607 specifies that the TGB must be a minimum of 6mm thick and 50mm wide copper busbar to accommodate multiple bonding conductor connections.

  4. What type of connector is recommended for bonding metallic cable pathways such as conduit and cable trays to the grounding system?

    Answer: Compression-type ground clamps

    Compression-type ground clamps provide a permanent, reliable, low-impedance mechanical connection for bonding metallic pathways to the grounding system.

  5. What is the primary purpose of an Equipment Bonding Conductor (EBC)?

    Answer: To connect equipment chassis to the TGB for equipotential bonding

    The EBC connects equipment chassis and metallic components to the TGB, ensuring all equipment in the room shares the same electrical potential.

  6. In a multi-story building, how should Telecommunications Grounding Busbars (TGBs) on each floor be interconnected?

    Answer: All TGBs must be connected to each other and to the TMGB via the TBB

    All TGBs must be interconnected via the Telecommunications Bonding Backbone (TBB) and ultimately connected to the TMGB, creating a single common grounding reference for the entire building.

  7. When routing grounding conductors for a telecommunications system, what installation practice must be avoided?

    Answer: Creating sharp bends or kinks in the conductor

    Sharp bends and kinks increase the inductance and impedance of the grounding conductor, significantly reducing its effectiveness against high-frequency transient events.