Pathways and Spaces Flashcards
6 cards from real DCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pathways and Spaces flashcards as text
According to the ANSI/TIA-569 standard, which of the following is a primary requirement for a Telecommunications Room (TR)?
Answer: The room must be dedicated solely to telecommunications functions.
The ANSI/TIA-569 standard specifies that a Telecommunications Room must be dedicated to the telecommunications function and not contain equipment unrelated to that purpose. False ceilings are not recommended, location should be centralized, and a minimum of two dedicated 20A circuits are required.
An installer is running new data cables through a fire-rated wall. What is the most critical action to take after creating the penetration?
Answer: Install an approved firestopping system to restore the barrier's rating.
Whenever a fire-rated barrier is penetrated for a cable pathway, it is mandatory to seal the opening with a qualified firestopping system. This action restores the original fire rating of the wall or floor, preventing the spread of smoke and fire.
When planning a horizontal cable pathway using cable trays, what is a key consideration to prevent signal degradation in data cables?
Answer: Ensuring separation between data and power cables.
To prevent electromagnetic interference (EMI) and signal degradation, it is a best practice and often a standard requirement to maintain separation between high-voltage power cables and low-voltage data cables.
A data cabling installer needs to create a pathway between two telecommunications rooms that are not vertically aligned on adjacent floors. Which of the following would be the most appropriate backbone pathway?
Answer: A minimum of one 3-inch trade size conduit.
For non-stacked telecommunications rooms, the ANSI/TIA-569 standard recommends connecting them with a minimum of one 3-inch (78mm) trade size conduit or an equivalent pathway to facilitate backbone cable installation. Pathways are not permitted in elevator shafts, and cables should not be laid directly on ceiling grids.
Which of the following describes an intumescent firestop product?
Answer: A material designed to swell and expand when exposed to high temperatures.
Intumescent firestop products are designed to swell and expand when heated. This expansion seals off openings left by burnt-away cable jackets or other materials, effectively blocking the passage of fire and smoke.
During a new installation in a data center, the plan calls for overhead cable trays. To ensure long-term reliability and allow for future growth, what is the maximum recommended cable tray fill ratio according to the National Electrical Code (NEC)?
Answer: 50%
According to Article 392 of the National Electrical Code (NEC), cable trays should not be filled beyond a 50% ratio. This practice prevents cable damage from overcrowding, allows for proper heat dissipation, and provides space for future cable additions without the need for new pathways.