C7 Grounding & Bonding for Low Voltage Systems 2

Question 1

Which ANSI/TIA standard specifically addresses telecommunications grounding and bonding for commercial buildings?

Accepted Answer

ANSI/TIA-607

Answer

ANSI/TIA-568

Answer

ANSI/TIA-569

Answer

ANSI/TIA-942

Question 2

What does the acronym 'TMGB' stand for in telecommunications grounding infrastructure?

Accepted Answer

Telecommunications Main Grounding Busbar

Answer

Terminal Mounted Ground Bus

Answer

Twisted Multi-Grade Bonding conductor

Answer

Total Mechanical Ground Bonding system

Question 3

Per NEC Article 800, how must the grounding conductor for a communications cable entering a building be terminated?

Accepted Answer

To the building's grounding electrode system or an acceptable NEC Article 250 grounding electrode

Answer

To the nearest metal water pipe or gas line

Answer

To the closest AC outlet equipment grounding conductor

Answer

To the metallic shield of the incoming cable only

Question 4

If a single ground rod electrode measures greater than what resistance value must a second grounding electrode be installed per NEC 250.56?

Accepted Answer

25 ohms

Answer

10 ohms

Answer

50 ohms

Answer

100 ohms

Question 5

What is a 'telecommunications bonding backbone' (TBB) in a multi-story building?

Accepted Answer

A conductor that interconnects all telecommunications grounding busbars (TGBs) to the main TMGB throughout the building

Answer

The main coaxial distribution cable for a CATV system

Answer

The primary fiber optic backbone cable between floors

Answer

A ground cable installed only on the exterior of the building

Question 6

Per NEC Table 250.66, what factor determines the sizing of the grounding electrode conductor (GEC)?

Accepted Answer

The size of the largest service entrance conductor or equivalent area for parallel conductors

Answer

The total number of circuits in the building

Answer

The physical distance from the service panel to the grounding electrode

Answer

The voltage rating of the electrical service

Question 7

Which grounding and protection requirement applies to exterior antenna systems installed on a building per NEC Article 810?

Accepted Answer

An antenna discharge unit must be installed and connected to an acceptable grounding electrode conductor

Answer

Antennas must use a dedicated 20-amp grounded circuit

Answer

Exterior antennas must be bonded only to the metal roof structure

Answer

Antenna grounding is optional if the antenna is below 30 feet in height