DCI Standards & Codes Compliance 3 — Questions and Answers
Question 1: Which NEC article governs the installation of coaxial cables used for community antenna television (CATV) systems?
- Article 770
- Article 800
- Article 820 (Correct answer)
- Article 830
Correct answer: Article 820
NEC Article 820 covers coaxial cable installations for CATV, CCTV, and similar radio frequency distribution systems.
Question 2: According to ANSI/TIA-568, the maximum distance for a horizontal cable run from the telecommunications outlet to the horizontal cross-connect is:
- 70 meters
- 90 meters (Correct answer)
- 100 meters
- 120 meters
Correct answer: 90 meters
TIA-568 limits horizontal cabling to 90 meters to allow 10 meters for patch cords and equipment cables while keeping the channel under 100 meters.
Question 3: A cable installer finds existing unlabeled cables in a ceiling space. Per TIA-606, the FIRST action should be to:
- Remove the cables immediately
- Label all cables before doing any work
- Test the cables with a toner probe
- Report to the building owner and document their location (Correct answer)
Correct answer: Report to the building owner and document their location
TIA-606 administration standards require documentation of existing infrastructure before modification, including notifying the responsible party.
Question 4: When bonding metallic cable sheaths to the telecommunications bonding backbone (TBB), the applicable standard is:
- ANSI/TIA-607-C (Correct answer)
- ANSI/TIA-568.2-D
- IEEE 802.3
- NEC Article 800
Correct answer: ANSI/TIA-607-C
ANSI/TIA-607-C covers telecommunications bonding and grounding planning and installation methods.
Question 5: Under NEC 800.156, communications outlets installed in dwelling units must be listed and:
- Installed only by a licensed electrician
- Marked with the cable type they support (Correct answer)
- Installed within 6 feet of an electrical outlet
- Connected to a dedicated circuit
Correct answer: Marked with the cable type they support
NEC 800.156 requires listed communications outlets in dwellings to be marked to identify the communications system they serve.
Question 6: Which ISO/IEC standard is the international equivalent to ANSI/TIA-568 for generic cabling systems?
- ISO/IEC 11801 (Correct answer)
- ISO/IEC 14763
- ISO/IEC 24702
- ISO/IEC 18010
Correct answer: ISO/IEC 11801
ISO/IEC 11801 is the international standard for generic cabling for customer premises, paralleling the TIA-568 series.
Question 7: The NEC requires separation between power and communications cables in raceways primarily to prevent:
- Interference with fire suppression systems
- Inductive coupling and electrical hazards (Correct answer)
- Violation of telecommunications warranties
- Exceeding conduit fill capacity
Correct answer: Inductive coupling and electrical hazards
Separation prevents inductive coupling (crosstalk from power lines) and reduces the risk of communications cables becoming energized.
DCI Standards & Codes Compliance 3
Which NEC article governs the installation of coaxial cables used for community antenna television (CATV) systems?