Indirect lighting is not permitted. Lighting fixtures must be on electrical circuits separate from the circuit that feeds the electrical outlets in the room. Do not place light fixture above equipment racks, cabinets, frames or other freestanding equipment to avoid blocking of light.
The rooms require an independent temperature control unit or thermostat. They shall be drilled and tapped to accommodate standard NEMA compliant grounding hardware. All TBBs must be tied to the telecommunications main grounding busbar TMGB located in the equipment room or main telecommunications room.
The ohmic resistance to ground from any point in the telecommunications grounding system must not be more than 3 ohms. It is usually located on the ground floor but may also be located in the basement. It is the main telecommunications serving point for the building. It will contain telecommunications equipment, much of it mounted on 19" racks. Cables will be spliced and terminated on the walls.
It is important that the entrance conduits stub up in the T-E-R as close to a corner as possible. A large building will require a larger T-E-R. A Node Room is used as a cabling hub not just for that building but also for other buildings in that neighborhood of the campus. A Node Room requires additional space, air conditioning, and additional entrance conduits.
It may require 30 amp outlets. In some cases, where a Node Room is designated in a building, a separate TR on the same floor as the Node Room may be required. See also paragraph F. Electrical Power for additional requirements in a Node Room. A fire suppression system must be installed in coordination with the campus Fire Marshall. A Node Room will house telephone equipment, batteries, routers for campus wide area network WAN , related local area network LAN switches, optical fiber cross connects and optical communications gear.
Hence, it should be located so that it is accessible for the delivery of large equipment throughout its useful life. It should be at least 10' from a potential source of EMI motors, transformers, photocopying equipment and the like. A node room must be accessible from the exterior of a building and may have a double door that opens out to allow equipment to be moved in and out of the room.
Provide a ramp if entrance to the node room is higher than ground elevation. Do not install doorsteps. They are the cabling hubs for floors within a building. They also contain network electronics, typically mounted in 19" racks. Typical room layouts follow at the end of this chapter. Homerun conduits: Each telecommunications outlet TO must be connected to the TR with a home run 1" conduit. Conduits should be run in the most direct route possible.
The number of bends in the conduit should be minimized. No more than two degree bends per conduit run is allowed. The use of "condulets" or "LB" type fittings is not allowed. No continuous run of conduit may exceed '. For runs more than feet, pull boxes must be installed so that no segment between pull boxes exceeds feet.
The conduit must have a pullstring with lbs. A 2-inch conduit is required to each wall-mounted box that supports a multi-user telecommunications outlet assembly MUTOA. It is suitable for use in locations where there is a cluster of machines that are within 15 feet from the MUTOA. Flexible conduits such as metallic flexible conduit are not desirable pathways for telecommunications cables because they tend to "creep" and "shift" and cause sheath damage to the cables.
Therefore, the use of flexible conduits as pathway for telecommunications cables must be avoided as much as possible. If flexible conduit is used it must be de-rated to next larger trade size.
Cable trays: TOs can also be connected to the TR via a combination of cable tray and conduit. UCSD has standardized on using ladder-type cable trays with trapeze-type mounting. Single point mounting is not acceptable. TOs should be connected to the cable tray with home run 1" conduits. Cable tray installation shall comply with all relevant seismic codes. It is important that the path for the cable tray is clear of obstructions, such as HVAC ducts, large pipes, and structural beams within the building.
Where fire or smoke barriers are penetrated by the cable tray, they shall be fire stopped to maintain the rating of the barrier. Alternatively, conduit sleeves may be used through the penetrations. They must be fire stopped as well.
The number of sleeves required depends on the number of cables and size of the tray. Two additional spare sleeves should be installed to accommodate future cable placement. Place cable trays above drop ceilings in corridors. Do not place them above offices or inaccessible spaces. There must be at least 4 inches of vertical space between the suspended ceiling tile and the bottom of the cable tray; 12 inches of vertical clearance from the top of the cable tray is required; and 2' total side clearance meaning, if the cable tray is wall mounted and there is no clearance on one side, then minimum clearance on the other side should be 2'.
It is desirable that the cable tray originates in the TR. If it does not originate from the TR then 4" conduits may be used to connect the TR to the cable tray. The number of 4" conduits required depends on the number of cables and size of tray. Two additional spare conduits should be installed to accommodate future cable placement. Access ceiling panels must be installed at foot intervals and at every junction and turn if cable tray is passing through a hard-lid ceiling.
The panels should be within 2 feet from the cable tray. They shall not be mounted directly underneath the cable tray. If the cable tray must pass through a seismic joint then it may be installed in one of three ways: 1. If the depth of the seismic joint is 12" or less, break the cable tray run into two sections, and leave the inch or less gap between them within the seismic joint. If the joint is deeper than 12", break the cable tray run into two sections, and overlap the ends vertically by no more than 4" within the joint with at least 4" vertical clearance between them, or, 3.
Break the cable tray run into two sections, and use 6" flexible conduits between them to span the depth of the seismic joint. The number of conduits depends on number of cables and size of cable tray plus one spare for future cable pulls.
Note: Use of flexible conduit must be avoided as much as possible, but if it is necessary to use them, then de- rate to the next larger trade size. All metallic cable trays must be grounded but should not be used as grounding conductor for equipment.
Perimeter raceway system: In a perimeter raceway, power and telecommunications cables must be in separate compartments and must comply with applicable electric codes. When metallic barrier is provided, it must be bonded to ground.
The barrier must run continuously throughout the length of the raceway. A double-gang pull box must be placed in the wall at foot interval along the length of the raceway. Riser conduits: A minimum of four 4-inch vertical riser conduits or sleeves are required between TRs. They must be installed as close to a corner in the TR as possible. It is mounted flush in the wall at the same height as the convenience electrical outlet: 18" AFF.
Use appropriate symbols to differentiate TOs that have additional interface, such as video or that support special devices like wireless access points. Floor-mounted outlets: Enclosures for floor mounted TOs must have cable pathways big enough to accommodate the amount of station cables and must accommodate standard jacks.
Conduits to floor- mounted TOs shall be run to the nearest cable tray preferably in the ceiling below the outlets or run to the TR on the same floor as the outlet.
Cables must be home run to the nearest TR on the same floor as the TOs. Miscellaneous Audio-visual, Intercom, and Paging Systems: Audio-visual AV systems, intercoms, and similar in-house paging devices are the responsibility of the architect.
December Learn how and when to remove this template message. To earn continuing education credits CECs for this course, you must pass a question online end of course assessment, which is included in the course fee. Please help improve this article by adding citations to reliable sources. Retired credentials are no bbicsi offered for certification, but valid holders of retired credentials may still claim to have earned them.
This course will also serve as the prerequisite for DD This article contains content that is written like an advertisement. DD is an intensive hands-on course focused on the design of structured cabling systems.
Now offering hands-on activities from day one, this knowledge-intensive course instructs you in real-world tasks, preparing you for life outside of the classroom. The RCDD examination is comprised of multiple-choice questions. Computer-based testing is the primary examination administration method through Pearson VUE. Those awarded with the RCDD biccsi have demonstrated their knowledge in the design, implementation and integration of information technology systems and related infrastructure.
Individuals bidsi for a review of telecommunications distribution systems. By using this site, you agree to the Terms of Use and Privacy Policy. Learn how to design distribution systems in this comprehensive course. You will design telecommunications spaces, as well as horizontal and backbone distribution systems. Articles lacking sources from December All articles lacking sources Articles with a promotional vicsi from September All articles with a promotional tone All stub articles.
Several design courses are recommended for candidates preparing to take the RCDD examination. In addition, students work together to complete a final group project, allowing them to put to use everything they learned in class. Designing Telecommunications Distribution Systems 5 days Learn how to design distribution systems in this comprehensive course.
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