Journeyman Electrician’s Exam Journeyman Electrician's Low Voltage Systems 3

Question 1

NEC Article 800 covers the installation of which type of systems?

Accepted Answer

Communications circuits such as telephone and data cables

Answer

Optical fiber cables for data networks

Answer

Coaxial cable for CATV distribution systems

Answer

Network-powered broadband communications systems

Question 2

Per NEC Article 800, communications cables entering a building must be:

Accepted Answer

Protected against physical damage at the point of entry

Answer

Installed in metallic conduit at the point of entry

Answer

Listed as Type CMR for all multi-story buildings

Answer

Grounded to the electrical system within 6 feet of entry

Question 3

Under NEC Article 800, the primary protector for communications circuits must be located:

Accepted Answer

As close as practicable to the point where the conductors enter the building

Answer

At the main electrical service panel

Answer

In a dedicated telephone equipment room

Answer

Within 10 feet of the utility network interface device

Question 4

NEC Article 820 covers the installation of which type of cabling system?

Accepted Answer

Coaxial cable for CATV and antenna distribution systems

Answer

Fire alarm circuits and detection devices

Answer

Telephone and intercom communications circuits

Answer

Low-voltage landscape and outdoor lighting

Question 5

The communications cable type designated 'CMR' is listed and rated for which specific application?

Accepted Answer

Riser applications — vertical runs between floors

Answer

Plenum air-handling spaces

Answer

Residential exterior direct-burial use

Answer

Industrial conduit installations with chemical exposure

Question 6

Per NEC Article 820, the minimum size grounding conductor required to ground the outer conductive shield of a CATV coaxial cable is:

Accepted Answer

14 AWG copper

Answer

18 AWG copper

Answer

12 AWG copper

Answer

10 AWG copper

Question 7

When installing communications cable (Article 800) and power conductors in a building, the NEC generally requires:

Accepted Answer

That communications cables not be placed in the same raceway as light, power, or Class 1 conductors

Answer

Communications cables to be in conduit whenever power wiring is present nearby

Answer

A minimum 2-inch separation between communications and power conductors in all cases

Answer

A GFCI device to protect all communications circuits in the same space as power wiring