L15PS00204_DIVISION_27_SPECIFICATIONS_AMENDMENT_001.pdf

JANUARY 2015 COMMON WORK RESULTS FOR COMMUNICATIONS

COTTONWOOD FIELD OFFICE REPLACEMENT 270500 - 1

SECTION 270500 - COMMON WORK RESULTS FOR COMMUNICATIONS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Communications equipment coordination and installation.

2. Sleeves for pathways and cables.

3. Sleeve seals.

4. Grout.

5. Common communications installation requirements.

1.3 DEFINITIONS

A. EPDM: Ethylene-propylene-diene terpolymer rubber.

B. NBR: Acrylonitrile-butadiene rubber.

1.4 COORDINATION

A. Coordinate arrangement, mounting, and support of communications equipment:

1. To allow maximum possible headroom unless specific mounting heights that reduce headroom are indicated.

2. To provide for ease of disconnecting the equipment with minimum interference to other installations.

3. To allow right of way for piping and conduit installed at required slope.

4. So connecting pathways, cables, wireways, cable trays, and busways will be clear of obstructions and of the working and access space of other equipment.

B. Coordinate installation of required supporting devices and set sleeves in cast-in-place concrete, masonry walls, and other structural components as they are constructed.

C. Coordinate location of access panels and doors for communications items that are behind finished surfaces or otherwise concealed.

D. Coordinate sleeve selection and application with building type.

L15PS00204 Amendment 001 Division 27 Specifications Amended

COTTONWOOD FIELD OFFICE REPLACEMENT 270500 - 2

PART 2 - PRODUCTS

2.1 SLEEVES FOR PATHWAYS AND CABLES

A. Steel Pipe Sleeves: ASTM A 53/A 53M, Type E, Grade B, Schedule 40, galvanized steel, plain ends.

2.2 SLEEVE SEALS

A. Description: Modular sealing device, designed for field assembly, to fill annular space between sleeve and pathway or cable.

1. Sealing Elements: EPDM interlocking links shaped to fit surface of cable or conduit.

Include type and number required for material and size of pathway or cable.

2. Pressure Plates: Plastic. Include two for each sealing element.

3. Connecting Bolts and Nuts: Carbon steel with corrosion-resistant coating of length required to secure pressure plates to sealing elements. Include one for each sealing element.

2.3 GROUT

A. Nonmetallic, Shrinkage-Resistant Grout: ASTM C 1107, factory-packaged, nonmetallic aggregate grout, noncorrosive, nonstaining, mixed with water to consistency suitable for application and a 30-minute working time.

PART 3 - EXECUTION

3.1 COMMON REQUIREMENTS FOR COMMUNICATIONS INSTALLATION

A. Comply with NECA 1.

B. Measure indicated mounting heights to bottom of unit for suspended items and to center of unit for wall-mounting items.

C. Headroom Maintenance: If mounting heights or other location criteria are not indicated, arrange and install components and equipment to provide maximum possible headroom consistent with these requirements.

D. Equipment: Install to facilitate service, maintenance, and repair or replacement of components of both communications equipment and other nearby installations. Connect in such a way as to facilitate future disconnecting with minimum interference with other items in the vicinity.

E. Right of Way: Give to piping systems installed at a required slope.

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3.2 SLEEVE INSTALLATION FOR COMMUNICATIONS PENETRATIONS

A. Communications penetrations occur when pathways, cables, wireways, or cable trays penetrate concrete slabs, concrete or masonry walls, or fire-rated floor and wall assemblies.

B. Concrete Slabs and Walls: Install sleeves for penetrations unless core-drilled holes or formed openings are used. Install sleeves during erection of slabs and walls.

C. Use pipe sleeves unless penetration arrangement requires rectangular sleeved opening.

D. Fire-Rated Assemblies: Install sleeves for penetrations of fire-rated floor and wall assemblies unless openings compatible with firestop system used are fabricated during construction of floor or wall.

E. Cut sleeves to length for mounting flush with both surfaces of walls.

F. Extend sleeves installed in floors 2 inches above finished floor level.

G. Size pipe sleeves to provide 1/4-inch annular clear space between sleeve and pathway or cable, unless indicated otherwise.

H. Seal space outside of sleeves with grout for penetrations of concrete and masonry

1. Promptly pack grout solidly between sleeve and wall so no voids remain. Tool exposed surfaces smooth; protect grout while curing.

I. Interior Penetrations of Non-Fire-Rated Walls and Floors: Seal annular space between sleeve and pathway or cable, using joint sealant appropriate for size, depth, and location of joint.

Comply with requirements in Division 07 Section "Joint Sealants."

J. Fire-Rated-Assembly Penetrations: Maintain indicated fire rating of walls, partitions, ceilings, and floors at pathway and cable penetrations. Install sleeves and seal pathway and cable penetration sleeves with firestop materials.

K. Roof-Penetration Sleeves: Seal penetration of individual pathways and cables with flexible boot-type flashing units applied in coordination with roofing work.

L. Aboveground, Exterior-Wall Penetrations: Seal penetrations using steel pipe sleeves and mechanical sleeve seals. Select sleeve size to allow for 1-inch annular clear space between pipe and sleeve for installing mechanical sleeve seals.

M. Underground, Exterior-Wall Penetrations: Install steel pipe sleeves. Size sleeves to allow for 1-inch annular clear space between pathway or cable and sleeve for installing mechanical sleeve seals.

3.3 SLEEVE-SEAL INSTALLATION

A. Install to seal exterior wall penetrations.

COTTONWOOD FIELD OFFICE REPLACEMENT 270500 - 4

B. Use type and number of sealing elements recommended by manufacturer for pathway or cable material and size. Position pathway or cable in center of sleeve. Assemble mechanical sleeve seals and install in annular space between pathway or cable and sleeve. Tighten bolts against pressure plates that cause sealing elements to expand and make watertight seal.

3.4 FIRESTOPPING

A. Apply firestopping to penetrations of fire-rated floor and wall assemblies for communications installations to restore original fire-resistance rating of assembly.

END OF SECTION 270500

JANUARY 2015 GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS

(REV APRIL 2015)

COTTONWOOD FIELD OFFICE REPLACEMENT 270526 - 1

SECTION 270526 - GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes description of acceptable grounding system for all telecommunications systems within the facilities. The end result will be a completed and customer-accepted grounding system that meets or exceeds specifications defined in Motorola R56, National Electric Code, ANSI/TIA-569, ANSI/TIA-607, ANSI/TIA-606, ANSI/TIA-568, and others as applicable, including the following:

1. Grounding conductors.

2. Grounding connectors.

3. Grounding busbars.

4. Grounding rods.

5. Grounding labeling.

1.3 DEFINITIONS

A. BCT: Bonding conductor for telecommunications.

B. EMT: Electrical metallic tubing.

C. IPGB: Internal Perimeter Ground Bus

D. NRTL: Nationally Recognized Testing Laboratory.

E. RGB: Rackmount grounding busbar.

F. TGB: Telecommunications grounding busbar.

G. TMGB: Telecommunications main grounding busbar.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product, including hardware, fittings, etc.

B. Shop Drawings: For grounding and bonding systems. Include plans, elevations, sections, details, and attachments to other work.

COTTONWOOD FIELD OFFICE REPLACEMENT 270526 - 2

1.5 INFORMATIONAL SUBMITTALS

A. As-Built Data: Plans showing as-built locations of grounding and bonding infrastructure, including the following:

1. Ground rods.

2. Ground and roof rings.

3. BCT, TMGB, TGBs, and routing of their bonding conductors.

B. Qualification Data: For Installer, installation supervisor, and field inspector.

C. Qualification Data: For testing agency and testing agency's field supervisor.

D. Field quality-control reports.

1.6 CLOSEOUT SUBMITTALS

A. Operation and Maintenance Data: For grounding to include in emergency, operation, and maintenance manuals.

1. In addition to items specified in Division 01 Section "Operation and Maintenance Data," include the following:

a. Result of the ground-resistance test, measured at the point of BCT connection.

b. Result of the bonding-resistance test at each TGB and its nearest grounding electrode. Were connections will be permanently covered or not readily visible after installation, photographs of each connection, placement of all components, identifying location in ground will be provided in soft-copy, such as a USB flash drive, using common picture formats such as JPG, JPEG, TIFF, TIF, GIF, or BMP.

1.7 QUALITY ASSURANCE

A. Installer Qualifications: Installer must have personnel certified by BICSI or Motorola on staff.

1. Installation Supervision: Installation shall be under the direct supervision of ITS Installer 2 or a Motorola Certified R56 Installer, who shall be present at all times when Work of this Section is performed at Project site.

2. Field Inspector: Currently registered by BICSI as a registered communications distribution designer, ITS Installer 2, or Motorola Certified R56 Installer to perform the on-site inspection. If qualifications are based on BICSI, installer and inspector will certify their knowledge, experience, and having completed projects in accordance with Motorola R56 standards.

3. Any conflict within the R56 that is not clarified within this document (should vs. shall), will coordinate with the customer to determine the preferred and acceptable method.

COTTONWOOD FIELD OFFICE REPLACEMENT 270526 - 3

PART 2 - PRODUCTS

2.1 SYSTEM COMPONENTS

A. All components shall be listed by a NRTL.

B. All components will be sourced by a manufacturer that is ISO 9001 certified

C. Comply with ANSI/TIA-607-B.

D. Telecommunications Main Grounding Busbar:

1. Locate a telecommunications main grounding busbar within 20-inches and below radio frequency cable entry to the telecommunications equipment room.

2.2 CONDUCTORS

A. Comply with UL 486A-486B.

B. Insulated Conductors: For internal grounding, stranded copper wire, green or green with yellow stripe insulation, insulated for 600 V, and complying with UL 83. For external grounding, tinned, solid copper conductor not less than No. 2 AWG.

1. Ground wire for custom-length active equipment ground jumpers shall be No. 6 AWG, 19-strand, UL-listed, Type THHN wire.

2. Cable Tray Equipment Grounding Wire: No. 2 AWG between cable tray and TMGB.

No. 6 AWG when bonding between individual cable tray components.

3. No. 6 AWG can only be used when total conductor length is less than 10 foot.

C. Cable Tray Grounding Jumper:

1. Not smaller than No. 6 AWG and no longer than 12 inches. Jumper shall have a crimped grounding lug with two holes and long barrel for two crimps. Attach with grounding screw with a star or split-type lock washer or connector provided by cable tray manufacturer.

D. Bare Copper Conductors:

1. Solid Conductors: ASTM B 3.

2. Stranded Conductors: ASTM B 8.

3. Tinned Conductors: ASTM B 33.

4. Bonding Cable: 28 kcmils, 14 strands of No. 17 AWG conductor, and 1/4 inch in diameter.

5. Bonding Conductor: No. 4 or No. 6 AWG, stranded conductor.

6. Bonding Jumper: Tinned-copper tape, braided conductors terminated with two-hole copper ferrules; 1-5/8 inches wide and 1/16 inch thick.

COTTONWOOD FIELD OFFICE REPLACEMENT 270526 - 4

2.3 CONNECTORS

A. Irreversible connectors listed for the purpose. Listed by an NRTL as complying with NFPA 70 for specific types, sizes, and combinations of conductors and other items connected. Comply with UL 486A-486B.

B. Compression Wire Connectors: Crimp-and-compress connectors that bond to the conductor when the connector is compressed around the conductor. Comply with UL 467.

1. Electroplated tinned copper, C and H shaped.

C. Signal Reference Grid Connectors: Combination of compression wire connectors, access floor grounding clamps, bronze U-bolt grounding clamps, and copper split-bolt connectors, designed for the purpose.

D. Busbar Connectors: Cast silicon bronze, solderless compression -type, mechanical connector;

with a long barrel and two holes spaced on 5/8- or 1-inch centers for a two-bolt connection to the busbar.

E. Welded Connectors: Exothermic-welding kits of types recommended by kit manufacturer for materials being joined and installation conditions.

F. Two-Hole, Long-barrel Copper Compression Lugs for Grounding Conductors:

1. Color-coded barrels marked with die index numbers and company logo for proper crimp die selection.

2. UL 486 Listed.

3. Tin-plated when connected with steel, galvanized steel, or aluminum surfaces.

4. Maintain a minimum 88% conductivity rating.

5. Only connection devices that require the complete removal of the conductor jacket or insulation and result in a connection to the complete conductor surface area will be suitable for use.

6. Will be used whenever possible over the use of a single-hole lug when not otherwise specified.

2.4 GROUNDING BUSBARS

A. TMGB: Predrilled, wall-mounted, rectangular bars of hard-drawn solid copper, 1/4 by 4 inches by 12 inches in length, increasing length as necessary to provide all connections plus 25% spare capacity in cross section. The busbar shall be NRTL listed for use as TMGB and shall comply with ANSI/TIA-607-B.

1. Predrilling shall be with holes for use with lugs specified in this Section, and will contain a minimum of 15 each 5/16 inch-hole two-hole lug with 5/8 inch spacing.

2. Mounting Hardware: Stand-off brackets and insulators that provide a minimum 2 inch clearance to access the rear of the busbar. Brackets and bolts shall be stainless steel.

Stand-off insulators for mounting shall be Lexan or PVC. Comply with UL 891 for use in 600-V switchboards, impulse tested at 5000 V.

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3. Will be placed within 20 inches of the location where RF cables enter the telecommunications room.

4. Will be constructed of solid copper 99.9 percent or better in purity.

B. Rack and Cabinet Grounding Busbars: Rectangular bars of hard-drawn solid copper, accepting conductors ranging from No. 14 to No. 2/0 AWG, NRTL listed as complying with UL 467, and complying with ANSI/TIA-607-B. Predrilling shall be with holes for use with lugs specified in this Section.

1. Cabinet-Mounted Busbar: Terminal block, with stainless-steel or copper-plated hardware for attachment to the cabinet.

2. Rack-Mounted Horizontal Busbar: Designed for mounting in 19-inch equipment racks.

Include stainless-steel or copper-plated hardware for attachment to the rack.

3. Ensure enough room is left to allow access and ensure proper cable bending radius can be maintained. Install appropriate standoffs to ensure enough isolation between the rack ground busbar and other metal to ensure no dissimilar metal contact.

4. Each rack will receive a rack-mounted ground busbar (RGB).

5. RGB will be solid copper.

6. RGB will be horizontally mounted at the top and rear of each rack, leaving enough room at the top to accommodate access and ensuring proper cable bend radius can be maintained.

7. RGB will have location for the installation of a two-hole lug connected to #2AWG ground wire which will connect the RGB into the ground bus conductor.

8. RGB will have enough pre-drilled holes to allow for the connection of no less than six one-hole ground lugs.

9. RGB will have appropriate standoffs installed between the RGB and the rack to ensure no contact between dissimilar metals.

2.5 GROUND RODS

A. Ground Rods: Solid Copper or Copper-clad steel; 5/8 by 96 inches in diameter.

2.6 LABELING

A. Comply with ANSI/TIA-606-B and UL 969 for a system of labeling materials, including label stocks, laminating adhesives, and inks used by label printers.

B. Adhesive Film Label with Clear Protective Overlay: Machine printed, in black, by thermal transfer or equivalent process. Minimum letter height shall be 3/8 inch. Overlay shall provide a weatherproof and UV-resistant seal for label.

COTTONWOOD FIELD OFFICE REPLACEMENT 270526 - 6

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine the ac grounding electrode system and equipment grounding for compliance with requirements for maximum ground-resistance level and other conditions affecting performance of grounding and bonding of the electrical system.

B. Inspect the test results of the ac grounding system measured at the point of BCT connection.

C. Prepare written report, endorsed by Installer, listing conditions detrimental to performance of the Work.

D. Proceed with connection of the BCT only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Bonding shall include the ac utility power service entrance, the communications cable entrance, and the grounding electrode system. The bonding of these elements shall form a loop so that each element is connected to at least two others.

B. Comply with NECA 1.

C. Comply with ANSI/TIA-607-B.

D. All connections to grounding conductors must be done so that each conductor maintains proper minimum 8 inch bending radius, with each attached conductor turned toward its attached TGB.

E. All mechanical connections must include appropriate as-needed anti-oxidant compound, proper metal to metal contact removing paint and other coatings where needed, and proper mechanical fastener torqueing to manufacturer specifications.

3.3 APPLICATION

A. Underground Grounding Conductors: Install bare tinned-copper solid conductor, No. 2 AWG minimum.

B. Conductor Terminations and Connections:

1. Pipe and Equipment Grounding Conductor Terminations: Bolted connectors.

2. Underground Connections: Welded connectors.

3. Connections to Ground Rods at Test Wells: Welded connectors.

4. Connections to Structural Steel: Welded connectors.

C. Conductor Support:

1. Secure grounding and bonding conductors at intervals of not less than 24 inches or closer as needed to prevent sagging of the conductor.

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D. Grounding and Bonding Conductors:

1. Install in the straightest and shortest route between the origination and termination point, and no longer than required. The bend radius shall not be smaller than eight-inches or eight times the diameter of the conductor, whichever is more. No one bend may exceed 90 degrees.

2. Install without splices.

3. Support at not more than 24-inch intervals and close as needed to ensure no sagging.

4. Install grounding and bonding conductors in 3/4-inch PVC conduit until conduit enters a telecommunications room. The grounding and bonding conductor pathway through a plenum shall be in EMT. Conductors shall not be installed in EMT unless otherwise indicated.

a. If a grounding and bonding conductor is installed in ferrous metallic conduit, bond the conductor to the conduit using a grounding bushing that complies with requirements in Division 26 Section "Raceways and Boxes for Electrical Systems," and bond both ends of the conduit to a TGB.

3.4 GROUNDING ELECTRODE SYSTEM

A. The BCT between the TMGB and the ac service equipment ground shall not be smaller than No. 2 AWG.

B. In this installation, the use of the phrase “ground ring” refers to the approximately 15 to 20-foot length of grounding conductor that will interconnect three grounding rods and all grounding conductors used for the telecommunications systems, as well as interconnect to the separate electrical grounding system to ensure a single-point ground system for the facility.

C. All external grounding, if buried, will be a minimum of 2AWG bare, tinned, solid copper conductor, and all connections will be made using exothermic bonding.

D. Ground rods for the ground ring will be spaced 10 to 15 feet from each other. Ground rods will be 8-foot in length by 5/8-inch in diameter, and will be solid copper or copper plated steel.

E. Ground bars will be installed vertically. When unable to install vertically, ground rods may be installed at an oblique angle not to exceed 45-degrees from vertical, or installed horizontally at right-angles pointing away from the building and ground ring.

F. Ground rods and the ground ring will be buried at least 30-inches below finished grade.

G. Ground rods must penetrate the frost line.

H. Ground Access Wells will be installed at each grounding rod location along the length of the ground ring. Wells will be a minimum of 10-inches in diameter, mounted flush to the surface, and extend to a depth of the top of the ground rod or below the frost line, whichever is deeper.

Ground wells will be constructed of materials suitable for their location and anticipated traffic.

Ground wells will have a cover that requires simple tools for removal. Install a loop of grounding conductor equivalent to the ground ring material that provides a clamp-point into the

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ground system at a depth between 6 and 12-inches from the surface, and connected to the ground system at two points, with one point on either side of the ground rod it is above.

I. Bending of a ground rod at any point is strictly prohibited.

J. The ground ring will be installed parallel to the building at a location of at least 3-feet away from the foundation, or beyond the dripline of the building, whichever is furthest.

K. External Ground Ring will not be permanently covered with solid materials that prevent proper moisture penetration. Examples of unapproved coverage include continuous pads or slabs, driveways, etc. made from asphalt, concrete, wood decking, etc.

L. Placement of anything that would prevent proper grounding system maintenance in the future is prohibited.

M. Connection from the ground system to the External Grounding busbar will be exothermically bonded.

N. Exposed grounding conductors such as those used for connection of the external ground

O. Testing – A ground test will be completed in accordance with Appendix D of the Motorola R56 standards. Results will be completed using Table D-4 or D-5 as applicable. A result of 25-Ohms must be achieved. Additional work on the part of the contractor will be required until this minimal resistance standard can be shown.

P. For the purpose of ensuring equalized telecommunications grounding between the main office building and the storage building, install a #2 AWG solid tinned copper conductor at a depth of no less than 30-inches between the ground ring and the storage building master ground busbar.

Place solid copper ground rods 5/8” diameter by 8 feet in length every 25 feet along this conductor. This conductor may run alongside the communications conduit identified elsewhere in this document.

Q. Ground access wells will be installed in two locations along this equalizing ground. Each well shall be placed above a ground rod, and placed within 6 feet of the main office building on the side closest to the storage building, and at the storage building on the side closest to the main office building. Test wells shall be installed as previously described elsewhere in this section.

3.5 GROUNDING BUSBARS

A. Indicate locations of grounding busbars on Drawings. Install busbars horizontally, on insulated spacers 2 inches minimum from wall, 12 inches above finished floor unless otherwise indicated.

B. Where indicated on both sides of doorways, route bus up to top of door frame, across top of doorway, and down; connect to horizontal bus.

COTTONWOOD FIELD OFFICE REPLACEMENT 270526 - 9

3.6 CONNECTIONS

A. Bond metallic items that are not active telecommunications equipment or housing active telecommunications equipment in a telecommunications equipment room to the IPGB in that room, using equipment grounding conductors not smaller than No. 6 AWG.

B. Stacking of conductors under a single bolt is not permitted when connecting to busbars.

C. Assemble the wire connector to the conductor, complying with manufacturer's written instructions and as follows:

1. Use crimping tool and the die specific to the connector.

2. Pretwist the conductor.

3. Apply an antioxidant compound to all bolted and compression connections.

D. Primary Protector: Bond to the TMGB with insulated bonding conductor.

E. Using listed 2-hole irreversible compression lug and No. 2 AWG stranded copper green or green with yellow-stripe insulated conductor, lay a primary ground bus conductor into the longest run of cable tray. Using irreversible compression fittings, “T” off this primary conductor a secondary conductor along each secondary cable tray path.

F. Install a rack ground conductor between the top of each equipment rack to the primary ground conductor. Use a 2-hole irreversible crimp connection to connect a No. 2 AWG stranded copper conductor with green or green with yellow-stripe insulation to connect to the primary ground conductor. Use an irreversible crimp connection to connect this conductor to the primary ground conductor.

G. Install a rack ground bus bar horizontally at the top of each equipment rack. Using listed 2-hole irreversible compression lug and a No. 2 AWG stranded copper green or green with yellow-stripe insulated conductor, connect the rack ground busbar to the primary ground bus conductor.

Connect to the ground bus conductor using listed irreversible crimp connection. The conductor used to connect the rack bus bar and the conductor used to connect the equipment rack to the primary ground bus should meet and travel together in parallel to the primary ground conductor.

H. Telecommunications Enclosures and Equipment Racks: Bond metallic components of enclosures to the telecommunications bonding and grounding system. Install top-mounted rack grounding busbar unless the enclosure and rack are manufactured with the busbar. Bond the equipment grounding busbar to the TMGB using No. 2 AWG bonding conductors.

I. Electrical Power Panelboards: Where an electrical panelboard for telecommunications equipment is located in the same room or space, bond each TMGB to the ground bar of the panelboard.

J. Shielded Cable: Bond the shield of shielded cable to the TGB in communications rooms and spaces. Comply with ANSI/TIA-568-C.1 and ANSI/TIA-568-C.2 when grounding screened, balanced, twisted-pair cables.

K. Rack- and Cabinet-Mounted Equipment: Bond powered equipment chassis to the cabinet or rack grounding bar. Power connection shall comply with NFPA 70; the equipment grounding

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conductor in the power cord of cord- and plug-connected equipment shall be considered as a supplement to bonding requirements in this Section.

3.7 CABLE TRAY

A. Using listed No. 2 AWG stranded copper green or green with yellow-stripe insulated conductor, connect installed cable tray to the telecommunications master grounding bus bar using the shortest and straightest path practical. Use listed 2-hole irreversible compression terminal lugs on both ends of the conductor.

3.8 INTERNAL PERIMITER GROUND BUS

A. Using two each No. 2 AWG stranded copper conductor with green or green with yellow-stripe insulation, install an internal perimeter ground bus horizontally at a location that is approximately 8 feet above the finished floor or within 1 foot below the ceiling. Each conductor will rise vertically from their connection point at the top and opposite ends of the TMGB.

Maintaining proper bend radius, each conductor will then turn to run horizontally, opposite directions of each other, as they encompass the perimeter of the telecommunications equipment room. Where these two conductors come together at the part of the room directly opposite of the TMGB, a 4 to 6 inch gap between these two conductors will be left. Conductors will be affixed to the wall using appropriate standoffs, insulators, and cable clamps to ensure the conductor maintains a distance of between 1.5 and 2.5 inches, with 2 inches preferred. The conductor will be supported at a maximum of 2 foot intervals and will be supported to ensure no sags or bends.

B. All fixed metal objects within the telecommunications equipment room must be properly grounded back to the Telecommunications Master Ground Bus Bar. If the metal item is or houses active (powered) equipment, the primary ground bus conductor located in the cable tray can be utilized. If the metal item is inactive, it can connect to the internal perimeter ground bus.

If the metal item is less than 10 feet from the ground conductor or the TMGB, you may utilize a No. 6 AWG stranded copper conductor with green or green with yellow-stripe insulation. If the metal item is in excess of 10 feet, utilize a No. 2 AWG stranded copper conductor with green or green with yellow-stripe insulation. Where connecting to a primary ground conductor, an irreversible compression crimp fitting must be used. If the metal object is conduit, removable tinned saddle-type ground clamps shall be used.

3.9 GROUNDING UNDERGROUND DISTRIBUTION SYSTEM COMPONENTS

A. Duct-Bank Grounding Conductor: Bury 12 inches above duct bank when indicated as part of duct-bank installation.

B. Comply with IEEE C2 grounding requirements.

C. Grounding Manholes and Handholes: Install a driven ground rod through manhole or handhole floor, close to wall, and set rod depth so 4 inches extends above finished floor. If necessary, install ground rod before manhole is placed and provide No. 1/0 AWG bare, tinned-copper conductor from ground rod into manhole through a waterproof sleeve in manhole wall. Protect ground rods passing through concrete floor with a double wrapping of pressure-sensitive

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insulating tape or heat-shrunk insulating sleeve from 2 inches above to 6 inches below concrete.

Seal floor opening with waterproof, nonshrink grout.

D. Grounding Connections to Manhole Components: Bond exposed-metal parts such as inserts, cable racks, pulling irons, ladders, and cable shields within each manhole or handhole, to ground rod or grounding conductor. Make connections with No. 4 AWG minimum, bonding conductor. Train conductors level or plumb around corners and fasten to manhole walls.

Connect grounding conductors to cable armor and cable shields according to written instructions by manufacturer of splicing and termination kits.

3.10 IDENTIFICATION

A. Labels shall be preprinted or computer-printed type.

1. Label TMGB(s) with "fs-TMGB," where "fs" is the telecommunications space identifier for the space containing the TMGB.

2. Label TGB(s) with "fs-TGB," where "fs" is the telecommunications space identifier for the space containing the TGB.

3. Label the BCT and each telecommunications backbone conductor at its attachment point:

"WARNING! TELECOMMUNICATIONS BONDING CONDUCTOR. DO NOT

REMOVE OR DISCONNECT!"

3.11 FIELD QUALITY CONTROL

A. Testing Agency: Engage a qualified testing agency to perform tests and inspections.

B. Perform tests and inspections.

C. Tests and Inspections:

1. Inspect physical and mechanical condition. Verify tightness of accessible, bolted, electrical connections with a calibrated torque wrench according to manufacturer's written instructions.

2. Test the bonding connections of the system using an ac earth ground-resistance tester, taking two-point bonding measurements in each telecommunications equipment room containing a TMGB and a TGB and using the process recommended by BICSI TDMM.

Conduct tests with the facility in operation.

a. Measure the resistance between the busbar and the nearest available grounding electrode. The maximum acceptable value of this bonding resistance is 100 milliohms.

3. Test for ground loop currents using a digital clamp-on ammeter, with a full-scale of not more than 10 A, displaying current in increments of 0.01 A at an accuracy of plus/minus

2.0 percent.

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a. With the grounding infrastructure completed and the communications system electronics operating, measure the current in every conductor connected to the TMGB. Maximum acceptable ac current level is 1 A.

D. Excessive Ground Resistance: If resistance to ground at the BCT exceeds 25 ohms, notify Architect promptly and include recommendations to reduce ground resistance.

E. Grounding system will be considered defective if it does not pass tests and inspections.

F. Prepare test and inspection reports.

END OF SECTION 270526

JANUARY 2015 (REV APRIL 2015) CABLE TRAYS FOR COMMUNICATIONS SYSTEMS

COTTONWOOD FIELD OFFICE REPLACEMENT 270536 - 1

SECTION 270536 - CABLE TRAYS FOR COMMUNICATIONS SYSTEMS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Ladder cable trays.

2. Wire-basket cable trays.

B. Related Requirements:

1. Division 26 Section "Cable Trays for Electrical Systems" for cable trays and accessories serving electrical systems.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: For each type of cable tray.

1. Show fabrication and installation details of cable trays, including plans, elevations, and sections of components and attachments to other construction elements. Designate components and accessories, including clamps, brackets, hanger rods, splice-plate connectors, expansion-joint assemblies, straight lengths, and fittings.

1.4 INFORMATIONAL SUBMITTALS

A. Coordination Drawings: Floor plans and sections, drawn to scale, on which the following items are shown and coordinated with each other, using input from installers of the items involved:

1. Include scaled cable tray layout and relationships between components and adjacent structural, electrical, and mechanical elements.

2. Vertical and horizontal offsets and transitions.

3. Clearances for access above and to side of cable trays.

4. Vertical elevation of cable trays above the floor or below bottom of ceiling structure.

B. Seismic Qualification Certificates: For cable trays, accessories, and components, from manufacturer.

COTTONWOOD FIELD OFFICE REPLACEMENT 270536 - 2

C. Field quality-control reports.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Delegated Design: Engage a qualified professional engineer, as defined in Division 01 Section "Quality Requirements," to design cable tray supports and seismic bracing.

B. Seismic Performance: Cable trays and supports shall withstand the effects of earthquake motions determined according to ASCE/SEI 7.

1. Component Importance Factor: 1.0.

2.2 GENERAL REQUIREMENTS FOR CABLE TRAYS

A. Cable Trays and Accessories: Identified as defined in NFPA 70 and marked for intended location, application, and grounding.

1. Source Limitations: Obtain cable trays and components from single manufacturer.

B. Sizes and Configurations: See the Drawings for specific requirements for types, materials, sizes, and configurations.

C. Structural Performance: See articles on individual cable tray types for specific values for uniform load distribution, concentrated load, and load and safety factor parameters.

D. Only cable trays specifically designed for communications purposes will be used (as opposed to standard electrical cable trays).

2.3 LADDER CABLE TRAYS

A. Description:

1. Configuration: Two side rails/stringers with transverse rungs welded to side rails/stringers.

2. Side Rail Height: 1-1/2 to 2-1/2 inches

3. Rung Spacing: 9 to 12 inches o.c.

4. Radius-Fitting Rung Spacing: 9 to 12 inches at center of tray's width.

5. Minimum Cable-Bearing Surface for Rungs: 1-inch width with smooth edges.

6. No portion of the rungs shall protrude below the bottom plane of side rails.

7. Structural Performance of Each Rung: Capable of supporting a maximum cable load, with a safety factor of 1.5, plus a 200-lb concentrated load, when tested according to

NEMA VE 1.

8. Minimum Usable Load Depth: Combined width and height designed so that volume is no more than 50 percent full with cable height no more than 6 inches.

COTTONWOOD FIELD OFFICE REPLACEMENT 270536 - 3

9. Width: When located within a telecommunications equipment room, no less than 18 inches outside width, 24 inches recommended.

10. Fitting Minimum Radius: 12 inches.

11. Class Designation: Comply with NEMA VE 1.

12. Splicing Assemblies: Bolted type using serrated flange locknuts.

13. Hardware and Fasteners: Steel, zinc plated according to ASTM B 633.

14. Splice Plate Capacity: Splices located within support span shall not diminish rated loading capacity of cable tray.

2.4 WIRE-BASKET CABLE TRAYS

A. Description:

1. Configuration: Wires are formed into a standard 2-by-4-inch wire mesh pattern with intersecting wires welded together. Mesh sections must have at least one bottom longitudinal wire along entire length of section.

2. Materials: High-strength-steel longitudinal wires with no bends.

3. Safety Provisions: Wire ends along wire-basket sides (flanges) rounded during manufacturing to maintain integrity of cables and installer safety.

4. Sizes:

a. Straight sections shall be furnished in standard 118-inch lengths.

b. Wire-Basket Depth: 2-inch usable loading depth by 18 inches wide.

5. Connector Assemblies: Bolt welded to plate shaped to fit around adjoining tray wires and mating plate. Mechanically joins adjacent tray wires to splice sections together or to create horizontal fittings.

6. Connector Assembly Capacity: Splices located within support span shall not diminish rated loading capacity of cable tray.

7. Hardware and Fasteners: Steel, zinc plated according to ASTM B 633.

2.5 MATERIALS AND FINISHES

A. Steel:

1. Straight Section and Fitting Side Rails and Rungs: Steel complies with the minimum mechanical properties of ASTM A 1011/A 1011M, SS, Grade 33.

2. Steel Tray Splice Plates: ASTM A 1011/A 1011M, HSLAS, Grade 50, Class 1.

3. Fasteners: Steel complies with the minimum mechanical properties of

ASTM A 510/A 510M, Grade 1008.

2.6 CABLE TRAY ACCESSORIES

A. Fittings: Tees, crosses, risers, elbows, and other fittings as indicated, of same materials and finishes as cable tray, as well as compatible with and recommended by the manufacturer for use with selected cable tray.

B. Barrier Strips: Same materials and finishes as for cable tray.

COTTONWOOD FIELD OFFICE REPLACEMENT 270536 - 4

C. Cable tray supports and connectors, including bonding jumpers, as recommended by cable tray manufacturer.

2.7 SOURCE QUALITY CONTROL

A. Testing: Test and inspect cable trays according to NEMA VE 1.

PART 3 - EXECUTION

3.1 CABLE TRAY INSTALLATION

A. Install cable trays according to NEMA VE 2.

B. Install cable trays as a complete system, including fasteners, hold-down clips, support systems, barrier strips, adjustable horizontal and vertical splice plates, elbows, reducers, tees, crosses, cable dropouts, adapters, covers, and bonding.

C. Fasten cable tray supports to building structure and install seismic restraints.

D. Design fasteners and supports to carry cable tray, the cables, and a concentrated load of 200 lb.

Comply with requirements in Division 26 Section "Hangers and Supports for Electrical Systems." Comply with seismic-restraint details according to Division 26 Section "Seismic Controls for Electrical Systems."

E. Support wire-basket cable trays with trapeze hangers.

F. Support trapeze hangers for wire-basket trays with 1/4-inch- diameter rods.

G. Make connections to equipment with flanged fittings fastened to cable trays and to equipment.

Support cable trays independent of fittings. Do not carry weight of cable trays on equipment enclosure.

H. Install expansion connectors where cable trays cross building expansion joints and in cable tray runs that exceed dimensions recommended in NEMA VE 2. Space connectors and set gaps according to applicable standard.

I. Seal penetrations through fire and smoke barriers.

J. Install capped metal sleeves for future cables through firestop-sealed cable tray penetrations of fire and smoke barriers.

K. Install with appropriate barriers and/or spacing to separate cables of different systems, such as power, communications, and data processing; or of different insulation levels, such as 600, 5000, and 15 000 V.

L. When located in telecommunications equipment rooms, cable tray will be installed such that the bottom of the cable tray is a minimum of 6 inches above the top of equipment racks.

M. A minimum of 12 inches above the top of the cable tray and the ceiling shall be maintained.

COTTONWOOD FIELD OFFICE REPLACEMENT 270536 - 5

N. “J-Bolts” (threaded, formed metal rods bent into a “J” shape) shall not be used for as fasteners for cable tray. Captive hardware such as threaded bolt, washers and nuts are recommended.

3.2 CABLE TRAY GROUNDING

A. Ground cable trays according to NFPA 70 unless additional grounding is specified. Comply with requirements in Section 270526 "Grounding and Bonding for Communications Systems."

B. Cable trays with communications cable shall be bonded together with splice plates listed for grounding purposes or with listed bonding jumpers.

C. Cable trays with control conductors shall be bonded together with splice plates listed for grounding purposes or with listed bonding jumpers.

D. Bond cable trays to power source for cables contained within with bonding conductors sized according to NFPA 70, Article 250.122, "Size of Equipment Grounding Conductors."

E. At each point where major physical cable tray components meet, bond those components together utilizing bonding jumpers. Bonding jumpers will be constructed of No. 6 AWG stranded copper conductor with green or green with yellow-stripe insulation. Bonding jumpers will be as short as practical, and will connect using 2-hole irreversible crimp lugs. Only a single bonding jumper is required per segment, meaning a bonding jumper is not required on both opposing sides of a cable tray segment. Ensure proper metal to metal contact is made, and appropriate anti-oxidant compound is utilized.

3.3 CABLE INSTALLATION

A. Install cables only when each cable tray run has been completed and inspected.

B. Fasten cables on horizontal runs with cable clamps or cable ties according to NEMA VE 2.

Tighten clamps only enough to secure the cable, without indenting the cable jacket.

C. Fasten cables on vertical runs to cable trays every 18 inches.

D. Fasten and support cables that pass from one cable tray to another or drop from cable trays to equipment enclosures. Fasten cables to the cable tray at the point of exit and support cables independent of the enclosure. The cable length between cable trays or between cable tray and enclosure shall be no more than 72 inches.

3.4 CONNECTIONS

A. Remove paint from all connection points before making connections. Repair paint after the connections are completed.

B. Connect raceways to cable trays according to requirements in NEMA VE 2.

COTTONWOOD FIELD OFFICE REPLACEMENT 270536 - 6

3.5 FIELD QUALITY CONTROL

A. Perform the following tests and inspections:

1. After installing cable trays and after electrical circuitry has been energized, survey for compliance with requirements.

2. Visually inspect cable insulation for damage. Correct sharp corners, protuberances in cable trays, vibrations, and thermal expansion and contraction conditions, which may cause or have caused damage.

3. Verify that the number, size, and voltage of cables in cable trays do not exceed that permitted by NFPA 70. Verify that communications or data-processing circuits are separated from power circuits by barriers or are installed in separate cable trays.

4. Verify that there are no intruding items such as pipes, hangers, or other equipment in the cable tray.

5. Remove dust deposits, industrial process materials, trash of any description, and any blockage of tray ventilation.

6. Visually inspect each cable tray joint and each ground connection for mechanical continuity. Check bolted connections between sections for corrosion. Clean and retorque in suspect areas.

7. Check for improperly sized or installed bonding jumpers.

8. Check for missing, incorrect, or damaged bolts, bolt heads, or nuts. When found, replace with specified hardware.

9. Perform visual and mechanical checks for adequacy of cable tray grounding; verify that all takeoff raceways are bonded to cable trays. Test entire cable tray system for continuity. Maximum allowable resistance is 1 ohm.

B. Prepare test and inspection reports.

3.6 PROTECTION

A. Protect installed cable trays and cables.

END OF SECTION 270536

JANUARY 2015 (REV APRIL 2015) COMMUNICATIONS EQUIPMENT ROOM FITTINGS

COTTONWOOD FIELD OFFICE REPLACEMENT 271100 - 1

SECTION 271100 - COMMUNICATIONS EQUIPMENT ROOM FITTINGS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Telecommunications mounting elements.

2. Backboards.

3. Telecommunications equipment racks and cabinets.

4. Telecommunications service entrance pathways.

5. Grounding.

B. Related Sections:

1. Division 27 Section "Communications Backbone Cabling" for voice and data cabling between communications rooms and between buildings.

2. Division 27 Section "Communications Horizontal Cabling" for voice and data cabling from the workstations to the voice/data room racks.

1.3 DEFINITIONS

A. Basket Cable Tray: A fabricated structure consisting of wire mesh bottom and side rails.

B. BICSI: Building Industry Consulting Service International.

C. LAN: Local area network.

1.4 SUBMITTALS

A. Product Data: For each type of product indicated. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes for equipment racks and cabinets. Include rated capacities, operating characteristics, electrical characteristics, and furnished specialties and accessories.

B. Shop Drawings: For communications equipment room fittings. Include plans, elevations, sections, details, and attachments to other work.

COTTONWOOD FIELD OFFICE REPLACEMENT 271100 - 2

1. Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

2. Equipment Racks and Cabinets: Include workspace requirements and access for cable connections.

3. Grounding: Indicate location of grounding bus bar and its mounting detail showing standoff insulators and wall mounting brackets.

C. Qualification Data: For Installer, qualified layout technician, installation supervisor, and field inspector.

1.5 QUALITY ASSURANCE

A. Installer Qualifications: Experienced installers, certified by the manufacturer, with at least 5 years’ experience installing and testing Category 6A cabling systems for 1 year in accordance with applicable EIA/TIA 568 Standards.

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

C. Telecommunications Pathways and Spaces: Comply with TIA/EIA-569-A.

D. Grounding: Comply with ANSI-J-STD-607-B.

1.6 PROJECT CONDITIONS

A. Environmental Limitations: Do not deliver or install equipment frames and cable trays until spaces are enclosed and weathertight, wet work in spaces is complete and dry, and work above ceilings is complete.

1.7 COORDINATION

A. Coordinate layout and installation of communications equipment with Government's telecommunications and LAN equipment and service suppliers. Coordinate service entrance arrangement with local exchange carrier.

1. Meet jointly with telecommunications and LAN equipment suppliers, local exchange carrier representatives, and Government to exchange information and agree on details of equipment arrangements and installation interfaces.

2. Record agreements reached in meetings and distribute them to other participants.

3. Adjust arrangements and locations of distribution frames, cross-connects, and patch panels in equipment rooms to accommodate and optimize arrangement and space requirements of telephone switch and LAN equipment.

4. Adjust arrangements and locations of equipment with distribution frames, cross-connects, and patch panels of cabling systems of other communications, electronic safety and security, and related systems that share space in the equipment room.

B. Coordinate installation of all equipment with government’s IT representatives.

COTTONWOOD FIELD OFFICE REPLACEMENT 271100 - 3

C. Coordinate location of power raceways and receptacles with locations of communications equipment requiring electrical power to operate.

PART 2 - PRODUCTS

2.1 PATHWAYS

A. General Requirements: Comply with TIA/EIA-569-C.

B. Cable Support: NRTL labeled. Cable support brackets shall be designed to prevent degradation of cable performance and pinch points that could damage cable. Cable tie slots fasten cable ties to brackets.

1. Comply with NFPA 70 and UL 2043 for fire-resistant and low-smoke-producing characteristics.

2. Support brackets with cable tie slots for fastening cable ties to brackets.

3. Lacing bars, spools, J-hooks, and D-rings.

4. Straps and other devices.

C. Conduit and Boxes: Comply with requirements in Division 26 Section "Raceway and Boxes for Electrical Systems."

1. Outlet boxes shall be no smaller than 2 inches wide, 3 inches high, and 2-1/2 inches deep.

2.2 BACKBOARDS

A. Backboards: Plywood, fire-retardant treated, 3/4 by 48 by 96 inches. Comply with requirements for plywood backing panels specified in Division 06 Section "Rough Carpentry." Provided and installed by General Contractor.

2.3 EQUIPMENT FRAMES

1. Equipment Racks will be 7-foot (45 Rack Units) in height (assuming 9-foot ceiling height)

2. Rack Channel/trough will be 3-inches in depth

3. Appropriate manufacturer approved rack isolation will be installed to ensure proper electrical isolation between the rack and the concrete floor.

4. Equipment mounting width will be 19-inch EIA standard

5. A minimum 6-inch wide vertical cable management will be placed between each rack and on the side of the rack closest to a wall.