C7 CATV, Satellite & Antenna Systems (NEC Articles 810 & 820)

Question 1

NEC Article 820 governs the installation of which type of low voltage system?

Accepted Answer

Community antenna television (CATV) and coaxial cable systems

Answer

Structured data cabling (Cat 5e/6/6A)

Answer

Class 2 remote-control signaling circuits

Answer

Optical fiber communication cables

Question 2

Per NEC Article 820, where must the coaxial cable from a CATV service be grounded when it enters a building?

Accepted Answer

At the point of entry to the building, as close as practicable

Answer

At the first splitter inside the building

Answer

At the cable company's pedestal at the street

Answer

Grounding is optional for CATV coaxial cable

Question 3

When installing a satellite dish on a residential rooftop, per NEC Article 810, the mast and mounting structure must be:

Accepted Answer

Bonded to the building's grounding electrode system

Answer

Connected to a separate ground rod isolated from the electrical system

Answer

Left ugrounded since satellite signals are high frequency

Answer

Grounded only if the dish exceeds 3 feet in diameter

Question 4

A CATV distribution system uses a two-way splitter at the point of entry to serve two TVs. Each two-way splitter introduces approximately how much signal loss?

Accepted Answer

3.5 dB

Answer

1 dB

Answer

10 dB

Answer

20 dB

Question 5

Which coaxial cable type is the current standard recommended for CATV, satellite, and over-the-air antenna installations in new residential construction?

Accepted Answer

RG-6 (75 ohm)

Answer

RG-59 (75 ohm)

Answer

RG-8 (50 ohm)

Answer

RG-58 (50 ohm)

Question 6

Per NEC Article 820.44, CATV coaxial cable installed in a plenum ceiling must be listed as which cable type?

Accepted Answer

CATVP (plenum-rated coaxial)

Answer

CATV (basic coaxial, no plenum rating required)

Answer

CATVR (riser-rated coaxial)

Answer

Any coaxial cable in conduit satisfies the requirement