DCI Grounding and Bonding 2

Question 1

What does TMGB stand for in telecommunications grounding terminology?

Accepted Answer

Telecommunications Main Grounding Busbar

Answer

Terminal Module Grounding Busbar

Answer

Transfer Main Ground Bridge

Answer

Twisted Medium Grounding Bond

Question 2

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

Accepted Answer

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

Answer

Using a separate grounding rod driven for each individual rack

Answer

Bonded together in series using short jumper cables between racks

Answer

Connected directly to the building's structural steel only

Question 3

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

Accepted Answer

6mm thick, 50mm wide copper bar

Answer

3mm thick, 25mm wide copper bar

Answer

10mm thick, 75mm wide copper bar

Answer

4mm thick, 40mm wide copper bar

Question 4

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

Accepted Answer

Compression-type ground clamps

Answer

Wire nuts twisted onto the conductor

Answer

Soldered connections wrapped with tape

Answer

Adhesive tape-based bonding connections

Question 5

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

Accepted Answer

To connect equipment chassis to the TGB for equipotential bonding

Answer

To carry data signals between networked equipment

Answer

To provide a backup AC power path during outages

Answer

To shield data cables from electromagnetic interference

Question 6

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

Accepted Answer

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

Answer

Each TGB should connect only to its nearest electrical panel

Answer

Each TGB should be independent with its own separate grounding electrode

Answer

TGBs should be connected in series from the top floor down to ground

Question 7

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

Accepted Answer

Creating sharp bends or kinks in the conductor

Answer

Running conductors inside metallic conduit

Answer

Labeling the conductors with identification tags

Answer

Using green-colored insulation on the conductors