Free BICSI RCDD Exam Practice Questions & Explanations
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A designer is calculating conduit sizing for a pathway that will contain three 24-strand indoor optical fiber cables and will include two 90-degree bends between pull points. To keep pulling tensions within limits and allow for future growth, the designer specifies a maximum conduit fill of 40 percent for the three cables.
Is the designer's 40 percent maximum fill for three or more cables consistent with recommended telecommunications pathway design practice?
Recommended practice for telecommunications conduit fill is approximately 53 percent for one cable, 31 percent for two cables, and 40 percent for three or more cables. Therefore specifying a 40 percent maximum fill for three cables is correct. Note that fill percentage alone is not sufficient; the designer must also account for bend radius, the number of bends between pull points (generally no more than two 90-degree bends, and 180 degrees total between pull boxes), and maximum pulling tension for the fiber cable.
A campus design includes an entrance facility in the basement of Building A. Metallic outside plant copper cable enters the building and runs 18 m (60 ft) to the primary protector location, then continues to the main cross-connect. The designer is reviewing bonding and grounding for this entrance.
Which statement best reflects correct design practice?
Primary protectors are installed as close as practicable to the point where the OSP cable enters the building to limit the length of unprotected cable inside the building that could carry hazardous voltages. Bonding conductors must be as short and as straight as practicable, avoiding unnecessary bends, because sharp bends and excess length increase impedance to transient currents. Protection requirements are driven by exposure (lightning, power contact, induction), not by an arbitrary length threshold, and locating protectors at a remote cross-connect leaves an unacceptable length of unprotected cable inside the building.
In a hospital renovation, a designer must route a 100-pair backbone cable and several 4-pair horizontal cables through a corridor that also contains branch circuit conduits and an unshielded 480 V, 5 kVA feeder in open cable tray. The electrical contractor proposes running the telecommunications cables in the same tray as the power feeder to save cost.
What should the designer specify?
Separation from electromagnetic interference sources is achieved by physical distance or by shielding/barriers. Where required separation from unshielded power conductors cannot be maintained, the accepted mitigation is a grounded metallic barrier between the systems or routing the telecommunications cables in an enclosed, grounded metallic raceway. Simply using shielded twisted-pair does not relieve the separation requirement, no healthcare exemption exists (in fact healthcare imposes additional requirements), and substituting coaxial cable does not eliminate EMI separation considerations.
A designer is sizing a telecommunications room for a floor with approximately 1,000 m2 (10,000 ft2) of usable office workspace. The client wants the smallest room that still complies with recommended practice for a dedicated, single-purpose TR serving that floor.
Which room dimensions should the designer specify?
Recommended TR sizing is based on served usable floor area: up to 500 m2 (5,000 ft2) uses 3 m x 2.2 m (10 ft x 7 ft); up to 800 m2 (8,000 ft2) uses 3 m x 2.8 m (10 ft x 9 ft); and up to 1,000 m2 (10,000 ft2) uses 3 m x 3.4 m (10 ft x 11 ft). Wait - for 1,000 m2 the correct recommended size is 3 m x 3.4 m (10 ft x 11 ft). The smaller options serve smaller areas, and 2 m x 2 m is not a recognized recommended TR dimension.
A designer is laying out a horizontal distribution system for a new four-story office building. Each floor is approximately 2,000 m2 (21,500 ft2) and will use balanced twisted-pair permanent links terminated in a telecommunications room (TR) on that floor. During coordination, the architect asks the designer to remove the second-floor TR and serve both the second and third floors from the third-floor TR to gain leasable space.
What is the designer's most technically appropriate response?
The horizontal permanent link is limited to 90 m (295 ft) of horizontal cable, with the total channel limited to 100 m (328 ft) including equipment cords and patch cords. A designer must confirm feasibility using actual routed distances (pathway routing, vertical rise between floors, slack, terminations, and cable dressing), not straight-line floor area. Answer A confuses the 100 m channel with the 90 m cable limit and skips verification. Category 8 is specified for short 30 m (98 ft) class data center links and reduces, not extends, reach. While standards recommend at least one TR per floor, they permit serving an additional floor when the floor area is small and distance limits are met, so a blanket rejection is not accurate.