RCDD Grounding, Bonding, and Electrical Protection 2

Question 1

Where should the Telecommunications Main Grounding Busbar (TMGB) be located?

Accepted Answer

In the main telecommunications room (MR/ER), bonded to the building's electrical grounding system

Answer

At the top of the main equipment rack in the MDF

Answer

Adjacent to the building's main electrical panel

Answer

At the entrance to each telecommunications room

Question 2

What is the minimum conductor size for a Grounding Electrode Conductor (GEC) connecting the TMGB to the building's electrical grounding electrode system?

Accepted Answer

6 AWG or larger as required by NEC

Answer

10 AWG

Answer

4 AWG

Answer

2/0 AWG

Question 3

Why should shield-continuity be maintained throughout a shielded cabling system?

Accepted Answer

To provide a continuous Faraday cage that blocks external electromagnetic interference

Answer

To allow signal regeneration at each connection point

Answer

To reduce insertion loss across the channel

Answer

To meet flammability ratings for plenum spaces

Question 4

What is the maximum impedance specified for a telecommunications bonding conductor in ANSI/TIA-607?

Accepted Answer

The conductor must present negligible impedance at DC and low frequencies

Answer

100 ohms

Answer

50 ohms

Answer

10 ohms

Question 5

Which of the following correctly describes a 'single-point ground' versus a 'mesh ground' in telecom facilities?

Accepted Answer

Single-point ground connects all equipment to one common ground; mesh interconnects multiple ground points throughout the facility

Answer

Single-point ground is used only for fiber systems; mesh is for copper

Answer

Mesh ground is only required in MRI or hospital environments

Answer

Single-point ground is required by TIA-607; mesh is an older deprecated method

Question 6

Gas tube protectors used as telecommunications primary protectors operate by:

Accepted Answer

Conducting current to ground when the voltage across them exceeds their breakdown voltage

Answer

Absorbing surge energy as heat through resistive elements

Answer

Clamping voltage at a fixed level using Zener diode action

Answer

Disconnecting the line with a fuse when overcurrent occurs