DCI Pathways and Spaces 3 — Questions and Answers
Question 1: What is the maximum number of 90-degree bends allowed in a single conduit run between pull points per NEC Article 358?
- 2
- 3
- 4 (Correct answer)
- 5
Correct answer: 4
The NEC limits a single conduit run to a maximum of 360 degrees of bends (equivalent to four 90-degree bends) between pull points.
Question 2: Which TIA standard provides guidelines for telecommunications pathways and spaces in commercial buildings?
- TIA-568
- TIA-569 (Correct answer)
- TIA-606
- TIA-942
Correct answer: TIA-569
TIA-569 is the standard that addresses telecommunications pathways and spaces for commercial buildings.
Question 3: A sleeve is best described as:
- A flexible conduit section used at vibrating equipment
- An opening through a wall, floor, or ceiling for passing cables (Correct answer)
- A grounding connector for cable shields
- A type of cable tray end cap
Correct answer: An opening through a wall, floor, or ceiling for passing cables
A sleeve is a round opening through a wall, floor, or ceiling that allows cables or conduits to pass through and must be firestopped after installation.
Question 4: When installing a cable tray in an area accessible to the public, what is the minimum mounting height from the floor?
- 6 feet
- 7 feet (Correct answer)
- 8 feet
- 9 feet
Correct answer: 7 feet
Cable trays installed in areas accessible to the public must be mounted at a minimum height of 7 feet (2.1 m) to prevent contact and ensure safety.
Question 5: What is the primary purpose of a pull box in a conduit system?
- To change conduit material type
- To provide access for pulling and splicing cables (Correct answer)
- To transition between conduit sizes
- To support conduit at ceiling drops
Correct answer: To provide access for pulling and splicing cables
A pull box provides an access point in a conduit run for pulling cables through the system, especially on long runs or runs with multiple bends.
Question 6: Which pathway type is formed by the structural cells of a concrete floor slab?
- Underfloor duct system
- Cellular floor raceway (Correct answer)
- Access floor system
- Poke-through fitting
Correct answer: Cellular floor raceway
Cellular floor raceways are formed by the hollow cells within precast or poured concrete floor slabs, which serve as built-in cable pathways.
Question 7: What does the acronym MER stand for in data center pathways and spaces terminology?
- Main Equipment Room (Correct answer)
- Media Exchange Rack
- Main Equipment Riser
- Main Entry Room
Correct answer: Main Equipment Room
MER stands for Main Equipment Room, which is the central space in a data center that houses core network and computing equipment.
DCI Pathways and Spaces 3
What is the maximum number of 90-degree bends allowed in a single conduit run between pull points per NEC Article 358?