Journeyman Electrician's Low Voltage Systems Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Low Voltage Systems flashcards as text
NEC Article 800 covers the installation of which type of systems?
Answer: Communications circuits such as telephone and data cables
Article 800 covers communications circuits, including telephone, telegraph, outside wiring for alarms, and similar central station communication systems.
Per NEC Article 800, communications cables entering a building must be:
Answer: Protected against physical damage at the point of entry
Per NEC 800.110, communications cables must be protected from physical damage at the point where they enter the building.
Under NEC Article 800, the primary protector for communications circuits must be located:
Answer: As close as practicable to the point where the conductors enter the building
NEC 800.90(B) requires the primary protector to be located as close as practicable to the point of entry to minimize the exposure of interior building wiring to lightning surges.
NEC Article 820 covers the installation of which type of cabling system?
Answer: Coaxial cable for CATV and antenna distribution systems
Article 820 specifically addresses coaxial cable installed for Community Antenna Television (CATV) and radio distribution systems in buildings.
The communications cable type designated 'CMR' is listed and rated for which specific application?
Answer: Riser applications — vertical runs between floors
CMR (Communications Riser) cable is listed for vertical runs in building risers and must resist the spread of fire from floor to floor per NEC Article 800.
Per NEC Article 820, the minimum size grounding conductor required to ground the outer conductive shield of a CATV coaxial cable is:
Answer: 14 AWG copper
NEC 820.100(A)(1) requires the grounding conductor for CATV coaxial cable shields to be no smaller than 14 AWG copper.
When installing communications cable (Article 800) and power conductors in a building, the NEC generally requires:
Answer: That communications cables not be placed in the same raceway as light, power, or Class 1 conductors
Per NEC 800.133, communications conductors shall not be placed in any conduit, junction box, or similar fitting with conductors of electric light, power, or Class 1 circuits.