CPCT Grounding, Bonding & Electrical Protection 3

Question 1

What is the minimum cross-sectional area specified by TIA-607 for the TMGB?

Accepted Answer

6 mm × 100 mm

Answer

3 mm × 50 mm

Answer

9 mm × 100 mm

Answer

The standard specifies current capacity, not physical dimensions

Question 2

During a grounding system inspection, a technician finds a high-resistance connection between the TGB and the TMGB. What is the most likely cause?

Accepted Answer

Oxidation or a loose mechanical connection on the conductor terminations

Answer

The TBB conductor is too large for the distance

Answer

The TGB was installed before the TMGB

Answer

The building's grounding electrode resistance is too low

Question 3

A lightning protection system on a building must be bonded to the telecommunications grounding system because:

Accepted Answer

NEC and TIA standards require all metallic systems to share the same grounding reference to prevent potential differences during a lightning strike

Answer

Lightning protection systems require the telecommunications ground for proper operation

Answer

Telecommunications cabling can act as a secondary lightning rod if not bonded

Answer

Building codes require it only in areas with more than 25 lightning days per year

Question 4

Which tool is used to measure the resistance of a grounding electrode to earth?

Accepted Answer

Earth ground resistance tester (fall-of-potential method)

Answer

Digital multimeter set to ohms

Answer

Clamp-on ammeter

Answer

TDR (Time Domain Reflectometer)

Question 5

What is the correct installation practice when the TBB must pass through fire-rated walls or floors?

Accepted Answer

The penetration must be sealed with an approved firestop system rated for the wall or floor assembly

Answer

The TBB is exempt from firestop requirements because it is a grounding conductor

Answer

The conductor must be routed around the fire-rated assembly using a longer path

Answer

Metal conduit is required for the entire length of the TBB in fire-rated areas

Question 6

When installing telecommunications equipment racks, the grounding lug on each rack should be connected to:

Accepted Answer

The TGB in the telecommunications room using an insulated copper conductor

Answer

The nearest structural steel column using the shortest possible conductor

Answer

The building's electrical panel neutral bus to minimize conductor length

Answer

Another equipment rack in a daisy-chain configuration for simplicity

Question 7

What is the purpose of applying anti-oxidant compound to aluminum conductor terminations in a grounding system?

Accepted Answer

To prevent oxidation that would increase contact resistance at the termination point

Answer

To increase the conductivity of the aluminum conductor

Answer

To meet NEC color-coding requirements for grounding conductors

Answer

To waterproof outdoor grounding connections against moisture ingress