University:
University of Houston
Course:
PHYS 4356 | Particle and Nuclear Physics
Academic year:

2022
Views:

157

Pages:

10
Author:

Harry Ellison

< #> I. Barrier Strips: Place as indicated on Drawings and fasten into the tray with self‐drilling screws. J. Accessories: Furnish special accessories as required to protect, support, and install a cable tray system. Accessories consist of but are not limited to section splice plates, expansion plates, blind‐end plates, specially designed ladder dropouts, barriers, etc. PART 3 ‐ EXECUTION 3.1 INSTALLATION A. Install pull boxes in conduits at intervals no greater than 100 feet. Install a pull box in conduit runs whenever there are two 90° sweeps, or a total of 180°of sweeps in a conduit run. A pull box may not be used to change the direction of a conduit run. Any deviations from these criteria must have prior approval from UITNS. B. Mount wall outlets in a minimum 4‐inch x 4‐inch x 2 ½‐inch double gang outlet box with a single gang mud‐ring. Stub gang boxes for outlets into the ceiling void via one 1‐inch conduit with pull string. C. Size communications pathways in accordance with the requirements of BICSI and the NEC where conduit, pull boxes, cable tray and other raceway sizes are not specifically shown on Drawings. The minimum conduit size shall be 1 inch. D. Bond all metallic telecommunications conduits entering the NF or the Building Distribution Frame (BDF) together and to the TMGB with a #6 AWG ground cable. E. Locate conduits entering the NF so as to allow for the greatest flexibility in the routing and racking of cables. F. Provide 4‐inch conduits between NFs. G. Terminate conduits or conduit sleeves entering through the floor of the NF, 2 inches above the finished floor. Position the outer diameter of the conduit within 4 inches of room walls. H. Conduit runs shall not exceed 100 feet or have more than two 90‐degree bends without the use of a properly sized junction box. Insulated throat compression fittings shall be used for communications conduit runs, with termination points having plastic or grounding bushings installed. I. Minimum radius for conduit bends: 1. 2. Internal diameter of less than 2 inches – 6 times the internal diameter. Internal diameter of more than 2 inches – 10 times the internal diameter. J. Install conduits in the most direct route possible from the NF to the work area. K. Do not run conduits next to hot water lines, steam pipes, or other utilities that may present a safety hazard or cause degradation of system performance. AE Project #: <> Pathways for Communications Systems UH Master: 03.2020 27 0528 ‐ 5 < #> L. Seal all in‐use and spare conduits entering the NF or BDF to prevent the intrusion of water, gases and rodents during the construction project. Within five days of releasing the conduit for the installation of cable, the Contractor shall ensure all conduits to be clean and dry. M. All conduits and cables that penetrate fire‐rated walls or floors shall be firestopped. N. The primary horizontal cable support system shall be conduit to cable tray, installed as shown in Technical Drawings. Place supports so that the support spans do not exceed maximum span indicated on Drawings. Cable tray shall be properly grounded. Wall penetrations shall transition to properly firestopped 1‐inch – 4‐inch sleeves, then back to cable tray. O. Outlets having one single cable shall have a single gang box that stubs up into the ceiling void via one (1) 1‐inch conduit with pull string. Use of flexible conduit is prohibited. P. Outlets having two or more cables shall have a double gang box with a single gang reducer that stubs up into the ceiling void via one (1) 1‐inch conduit with pull string. Q. Neatly dress cables along common paths with Velcro tie wraps, with voice cables separated from data cables. Do not exceed the maximum number of cables per bundle specified by the manufacturer. Add separate parallel J‐hook pathway when cable count requires it. R. J‐hooks shall be installed 4 to 5 feet apart. Avoid uniform spacing to minimize problems with signal degradation. S. Use methods approved by the manufacturer to support J‐hooks from decking or building structure. T. Lay out cable pathway runs in advance to determine space requirement along pathways, and to ensure non‐interference from other trade installations. U. Do not support communications pathway from, or lay on, ceiling suspension system or use electrical, plumbing or other pipes for support. Communications pathway supports shall be permanently anchored to building structure or joist. V. Provide attachment hardware and anchors designed for the structure to which attached, and that are suitably sized to carry the weight of the pathway and cables to be supported. Confirm installation procedures for cable support system with the Architect before implementation. W. Ream conduits to eliminate sharp edges. Terminate metallic conduit with an insulated bushing. Initial sealing of the sleeve penetration shall be completed by the sleeve installer. Refer to ANSI/TIA/EIA‐606 and Section 27 0553 Identification for Communications Systems for administration of the pathway system. X. The inside of the cable tray or wireway shall be free of burrs, sharp edges or projections that can damage cable insulation. For abrasive supports (e.g., threaded rod), protect the portion within the tray with a smooth, non‐scratching covering so that cable can be pulled without physical damage. AE Project #: <> Pathways for Communications Systems UH Master: 03.2020 27 0528 ‐ 6 < #> Y. When a wireway passes through a partition or wall, it must be an unbroken length. Z. Do not exceed the fill requirements when installing telecommunications cables. AA. Properly firestop openings in fire‐rated walls, floors and ceilings. BB. Install barriers between power and telecommunications cables per electrical code. CC. Do not use cable trays and wireways as walkways or ladders unless specifically designed and installed for that purpose. DD. Locate supports where practicable so that connections between sections of the tray fall between the support point and the quarter section of the span. Support centers shall be in accordance with the load and span for the applicable class as specified in the NEC. A support shall be placed within 600 mm (2 feet) on each side of any connection to a fitting. Support wireways on 1500 mm (5 feet) centers unless designed for greater lengths. EE. Provide and maintain a minimum of 12‐inch headroom above a cable tray. Ensure that other building components (e.g., air conditioning ducts) do not restrict access to trays or wireways. 3.2 MINIMUM CLEARANCES A. Communications pathway minimum clearances: 1. 2. 3. 4. 5. 6. 7. 3.3 Minimum of 1 foot parallel, 3 inches crossover from power cables and conduits. Minimum of 6 inches above ceiling tiles. Minimum of 24 inches from hot flues, steam pipes, hot water pipes and other hot surfaces. Minimum of 3 feet separation from electrical panel boards. Minimum of 5 inches from lighting fixtures. Minimum of 6 feet separation from electrical motors and transformers. Minimum of 2 inches from exposed all‐thread rods. FIRESTOPPING A. Provide fire‐resistant materials to restore fire ratings to all wall, floor or ceiling penetrations used in the distribution and installation for communications cabling system. B. Comply with requirements as stated in Division 07 Penetration Firestopping. END OF SECTION 27 0528 AE Project #: <> Pathways for Communications Systems UH Master: 03.2020 27 0528 ‐ 7 < #> SECTION 27 0543 – UNDERGROUND DUCT AND RACEWAYS Revise this Section by deleting and inserting text to meet Project‐specific requirements. This Section uses the term "Architect" or “Engineer.” Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions. Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed. Delete hidden text after this Section has been edited for the Project. PART 1 ‐ GENERAL 1.1 RELATED DOCUMENTS A. The Contractor's attention is specifically directed, but not limited, to the following documents for additional requirements: 1. 2. 3. 1.2 The current version of the Uniform General Conditions for Construction Contracts, State of Texas available on the web site of the Texas Facilities Commission. The University of Houston’s Supplemental General Conditions and Special Conditions for Construction. The University of Houston’s Network Infrastructure Design Standards (available at https://uh.edu/infotech/services/computing/networks/network‐infra‐standards/). SUMMARY A. Section Includes: Revise subparagraph(s) below to suit Project. 1. 2. 3. 4. 5. Cutting and Patching Asphalt and Concrete. Trenching and Excavation Underground Conduit Systems. Cable Routing Hardware. Horizontal Directional Drilling – Also commonly referred to as Directional Boring or Guided Horizontal Boring. B. Work covered by this Section consists of providing all services, labor, materials, tools, and equipment required for the complete and proper installation of exterior telecommunications pathways as called for in these Specifications and related Drawings. C. Detailed summary of work (Designer to provide a detailed summary of all work to be performed.) 1. 2. 3. 4. Incoming Service Duct‐bank: [Description] Primary Duct‐bank: [Description] Feeder Duct‐bank: [Description] Innerduct: [Description] AE Project #: <> 27 0543 ‐ 1 UH Master: 03.2020 < #> 1.3 PREINSTALLATION MEETINGS A. Preconstruction Conference: Conduct conference at [Project site] . The Contractor and the Facilities Project Manager lead the meeting. The UIT Project Manager must be invited to the Preinstallation meetings. Copy subparagraph below and edit for each activity required for preconstruction conference. 1. 1.4 . SUBMITTAL ADMINISTRATIVE REQUIREMENTS A. 1.5 Follow the Submittal Administrative Requirements as stated in Section 01 3300 Submittal Procedures. For submittals to UIT, use electronic format only. ACTION SUBMITTALS A. Before installation begins: 1. 2. 3. 1.6 Provide notification, in writing, of conditions detrimental to proper completion of the Work or conditions deviating from Drawings. Provide Shop Drawings of all core drilling locations for coordination with Architect and Owner prior to drilling. Obtain University Information Technology Network Services (UITNS) approval before installation proceeds. INFORMATIONAL SUBMITTALS A. AS‐BUILT DRAWINGS 1. 2. 1.7 Submit drawings with notations reflecting any variations from the Specifications and Drawings, including As‐built conduit routing. Provide Excel spreadsheet with GPS coordinates of all handholds and manholes. QUALITY ASSURANCE A. Perform all installation work for the new exterior telecommunications pathways in a neat and workmanlike manner. B. Materials and work specified herein shall comply with the applicable requirements as stated in Section 27 0500 . C. For horizontal directional drilling, the Contractor shall follow all procedural precautions necessary to ensure that the essential aspects of proper directional bore installation are adequately controlled. AE Project #: <> 27 0543 ‐ 2 UH Master: 03.2020 < #> PART 2 ‐ PRODUCTS The paragraph and subparagraphs in this Article demonstrate the line spacing format for subparagraphs not subordinate to the preceding subparagraph. 2.1 PARTS AND MANUFACTURERS A. Refer to Section 01 2500 Substitution Procedures for variations from approved manufacturers or parts. Obtain written approval from UITNS before requesting a substitution for work covered by Division 27 Communications. B. TRENCH/BACKFILL MATERIALS Refer to Division 31 Trenching, Backfilling, and Compaction for requirements. C. CONDUIT SYSTEM 1. Non‐Metallic Conduit: a. b. 2. PVC plastic pipe: ASTM D1785, Schedule 40, Type PVC 1120. Tone Tape: Arnco DL WP12LC Tone Tape, or equivalent. Electrical Metallic Tubing (EMT): Electro‐galvanized steel tubing ¾ inch and larger diameter per project requirements. a. b. c. d. e. f. Conduit joint couplings and connectors ‐ steel double set screw indenter fittings. Metal bushings for ¾‐inch and 1‐inch conduit. Insulated metallic bushings for 1‐1/4 inch and larger conduit. Insulated metallic bushings with grounding lugs as required. Conduit sweeps ‐ minimum 10 times the conduit inside diameter. Include required conduit straps and hangers, heavy‐duty malleable iron or steel. Perforated pipe strap and wire hangers are not permitted. 3. Inside Pull‐Boxes: Refer to Section 27 0528 Pathways for Communications Systems for inside pull‐boxes for conduit entering building. 4. Outside Pull‐Boxes: Minimum 14 gauge galvanized steel with weatherproof locking cover and hardware for surface mounting as required for Project. Dimensions as required for Project. 5. Test mandrel: shall be ¼ inch smaller than inside conduit diameter and minimum 12 inches long. 6. Pull‐rope: ¼‐inch Nylon pull rope. 7. Core Drill Seals for Outside Building Walls: Link‐Seal waterproof assembly or equal. Manufactured by PSI/Thunderline/Link‐Seal. 8. Conduit Caulking Compound: Choose compounds for sealing conduit ducts that have putty‐like consistency workable with hands, at temperatures as low as 35 degrees Fahrenheit, do not slump at a temperature of 300 degrees Fahrenheit, and do not harden materially when exposed to air. Compounds shall readily caulk or adhere to clean surfaces AE Project #: <> 27 0543 ‐ 3 UH Master: 03.2020 < #> of plastic conduit, metallic conduits, or conduit coatings; concrete, masonry; any cable sheaths, jackets, covers or insulation material and common metals. Compounds shall form a seal without dissolving, noticeably changing characteristics, or removing any of the ingredients. Compounds shall have no injurious effect on the hands of workers or upon materials. 9. Underground Plastic Line marker: Manufacturer’s standard permanent, continuous‐ printed polyethylene film tape with metallic core, intended for direct burial service; not less than 3 inches wide x 4 mils thick. Provide orange tape with black text reading, “CAUTION FIBER OPTIC CABLE BELOW”. 10. Ground Wire: Bare Copper # 6 11. Tracer Box: NEMA‐3 4‐inch x 4‐inch weatherproof box 12. Spacers for 4‐inch Conduit: Carlon S289NJN Intermediate Spacer and S288NJN Base Spacer. 13. Precast Concrete Vault: a. b. c. d. e. f. g. h. General: Provide precast concrete communications vault as detailed on the Drawings and as required for installation of new duct‐bank systems and connection to existing duct‐bank systems at locations shown on the Drawings. Provide 4‐foot x 8‐foot x 6‐foot deep precast. Design: Vaults shall be steel reinforced and the complete vault assembly designed for H‐20‐44 bridge loading. Clearly indicate in submittals all dimensions and reinforcing steel. Concrete: Construct vaults using concrete with a 4500 psi 28‐day strength. Concrete mix shall be designed in accordance with ASTM standards. Reinforcing Steel: Use intermediate or hard grade billet steel conforming to ASTM A15, deformed in accordance with ASTM A305. Vaults: Vault and pull box covers for all non‐traffic areas shall be made of ductile iron cover; covers in parking and traffic areas shall be cast iron and rated for heavy vehicular traffic. Mount covers in a 30‐inch Type "B" or "WRM" frame. Dowel the frame and neck into the vault to prevent movement away from the opening. Mark voice and data communications vaults and pull box covers with the text "TELECOMMUNICATIONS". Conduit Entry: For plastic conduits, include a bell end inside the vault or pull box, mounted flush and grouted to seal openings. Provide precast fiber type terminators for each duct‐bank entry. Grounding: A #4/0 bare copper ground wire shall penetrate the side wall in the bottom section of each vault and pull box and extend 48 inches inside and outside of the vault pull box. Accessories: Provide knockouts, cable racks, sumps, steps, joint seals and other accessories shown on the Drawings or as required for a complete installation. 14. Duct Plug 4‐inch: General Machine Products (GMP) 6668R16 15. End Bell 4‐inch: Carlon E297N 16. Multi‐cell Fabric Mesh Duct: AE Project #: <> 27 0543 ‐ 4 UH Master: 03.2020 < #> a. b. D. Manufacturer: MaxCell. Use only manufacturer’s fittings, transition adapters, terminators, accessories and installation kits. CABLE ROUTING HARDWARE 1. Cable Rack with Support Hardware as required (or comparable): a. b. 2. 18‐Hole: Condux 08380200, Chance C203‐1126 Other sizes as required: Condux, Chance Cable Rack Steps/Hooks: a. b. 4‐inch: Condux 08380600, Chance C203‐1131 Other sizes as required: Condux, Chance 3. “S” Rack Supports: Condux, Chance 4. Step Lock Wedge: Panduit CHW‐C20 PART 3 ‐ EXECUTION 3.1 INSPECTION A. Examine areas and conditions under which the new exterior telecommunications pathways are to be installed. B. Verify field measurements and pathway routing conditions are as shown on Drawings. C. If discrepancies or problems are found, notify Architect, and wait for direction. Beginning of telecommunications pathway installation indicates Contractor acceptance of existing conditions. 3.2 EXCAVATING, TRENCHING AND BACKFILLING: A. General: The Work hereunder includes excavation and backfill as necessary to install the voice and data communications work. Coordinate voice and data communications work with other work in the same area, including excavating and backfilling, dewatering, floor protection provisions, other temporary facilities, other underground services (existing and new), landscape, paving, structural foundations and floor slabs on grade. Coordinate with weather conditions and provide temporary facilities needed for protection and proper performance of excavating and backfilling. B. Standards: Comply with the applicable provisions of Division 31 Trenching, Backfilling, and Compaction. Refer instances of uncertain applicability to the Architect/Engineer for resolution before proceeding with the Work. C. Refer to Owner before cutting or drilling any surface. D. All utilities are to be located by Contractor and exposed, if necessary, prior to construction. AE Project #: <> 27 0543 ‐ 5 UH Master: 03.2020 < #> E. Before excavation, notify UITNS PM of work to be done so that service interruptions in existing fiber pathways can be prevented. A UIT employee must be present during excavation. F. Voice and data communications duct‐banks shall be independent and not shared with any other systems. G. Accurately excavate the bottom of the trench to provide firm, uniform bearing for the bottom of raceways and duct‐banks. Where mud or unstable soil is encountered in bottom of trench, remove it to firm bearing and backfill the trench with bedding sand to proper grade and tamp to provide uniform firm support. H. Accurately grade the bottom of trenches to provide proper fall and uniform bearing and support for each section of the conduit on undisturbed soil or 2 inches of sand fill at every point along its entire length. In general, grading for voice and data communications duct‐banks and conduits shall be from building to vault, and from a high point between vaults to each vault. I. Exercise care not to excavate below required depth, leaving a flat bed of undisturbed earth, firm and secure, before laying conduit. In the event rock is encountered, excavate 6 inches below required depth and backfill to required depth with bedding sand, and compact to minimum 95% compaction. J. Control all grading in the vicinity of excavation to prevent surface ground water from flowing into the excavations. Remove any water accumulated in the excavations by pumping or other acceptable method. During excavation, stack material suitable for backfilling in an orderly manner, a sufficient distance back from edges of trenches to avoid overloading and prevent slides or cave‐ins. Material unsuitable for backfilling shall be removed from the site and properly disposed of. K. If any unknown and/or uncharted utilities are encountered during excavation, promptly notify Architect/Engineer and wait for instructions before proceeding. L. If unknown utilities are encountered and work is continued without contacting the Architect/Engineer for instructions, and damage is caused to said utilities, the Contractor shall repair such damage, at his own expense, to the satisfaction of the Owner or utility company concerned. M. Do not backfill trenches until all required tests have been made by the Contractor and approved by the Architect/Engineer. N. Backfill shall be cement stabilized sand up to 6 inches above the top of conduit or duct‐bank. Backfill up to grade shall be in maximum 6‐inch lifts with minimum 95% compaction of lifts. Refer to Division 31 Trenching, Backfilling, and Compaction for additional requirements. O. Opening and Re‐closing Pavement, Landscape Areas and Lawns: Where excavation requires the opening of existing walks, street, drives, other existing pavement or lawns, such surfaces shall be cut as required to install new conduit and to make new connections to existing conduits. The sizes of the cut shall be held to a minimum, consistent with the work to be accomplished. After installation of the new work is completed and the excavation has been backfilled and flooded, AE Project #: <> 27 0543 ‐ 6 UH Master: 03.2020

Communications General Provisions Ch4

of 10

Description

Free up your schedule!

Take 5 seconds to unlock