RCDD Cabling Infrastructure and Pathways 2 — Questions and Answers
Question 1: What is the recommended minimum inside diameter for a single-user conduit stub-up at a workstation outlet?
- 25 mm (1 in) (Correct answer)
- 16 mm (5/8 in)
- 32 mm (1.25 in)
- 19 mm (3/4 in)
Correct answer: 25 mm (1 in)
ANSI/TIA-569 recommends a minimum 25 mm (1 inch) inside diameter for single-user outlet conduit stubs to accommodate telecommunications cabling.
Question 2: How should optical fiber cable be protected where it passes through a wall or floor?
- Installed in a sleeve or conduit (Correct answer)
- Wrapped in foam insulation
- Taped to adjacent copper cables
- Secured with cable staples
Correct answer: Installed in a sleeve or conduit
Optical fiber cable must be installed in a sleeve or conduit wherever it passes through walls or floors to prevent physical damage and maintain fire ratings.
Question 3: What is the primary purpose of a cable runway (ladder rack) in a data center?
- To provide an overhead cable management pathway between equipment racks (Correct answer)
- To serve as a grounding conductor for equipment
- To support raised floor panels
- To separate power and data cables at ground level
Correct answer: To provide an overhead cable management pathway between equipment racks
Cable runways (ladder racks) provide overhead pathways for routing and managing cables between equipment racks in data center environments.
Question 4: Per BICSI TDMM, what is the maximum span between cable tray support brackets for standard aluminum tray?
- 1.5 m (5 ft)
- 3 m (10 ft) (Correct answer)
- 2.4 m (8 ft)
- 4.5 m (15 ft)
Correct answer: 3 m (10 ft)
Standard aluminum cable trays should have support brackets spaced no more than 3 meters (10 feet) apart to prevent deflection under cable load.
Question 5: Which of the following correctly describes a modular furniture system's telecommunications cabling path?
- Cables run within modular furniture raceways from a consolidation point or multi-user outlet (Correct answer)
- Cables run directly from the TR through open ceiling space to each workstation
- All modular furniture connects directly to the main cross-connect
- Cables are surface-mounted on the exterior of furniture panels
Correct answer: Cables run within modular furniture raceways from a consolidation point or multi-user outlet
Modular furniture cabling uses consolidation points or multi-user outlets (MUTOAs) in the open office, with cables routed within the furniture raceways to each workstation.
Question 6: What is the primary reason for derating cable ampacity when cables are bundled in a conduit?
- Heat buildup from multiple cables reduces individual cable current capacity (Correct answer)
- Bundled cables increase electrical resistance
- Bundling degrades the cable's insulation rating
- Multiple cables in one conduit violate NEC requirements
Correct answer: Heat buildup from multiple cables reduces individual cable current capacity
Bundled cables generate cumulative heat that cannot dissipate as efficiently, requiring ampacity derating to prevent insulation damage and fire hazards.
RCDD Cabling Infrastructure and Pathways 2
What is the recommended minimum inside diameter for a single-user conduit stub-up at a workstation outlet?