SECTION 270526- GROUNDING AND BONDING FOR COMMUNICATIONS
PART 1.
GENERAL
INCLUDES
1.1
A.
The extent of electrical grounding and bonding work is indicated by drawings and schedules
and as specified herein. Grounding and bonding work is defined to encompass systems,
circuits, and equipment.
B.
The type of electrical grounding and bonding work specified in this section includes the
following:
1)
Solidly grounded systems
2)
Application of electrical grounding and bonding work in this section includes the
following:
(a)
Exposed metal piping
(b)
Electrical power systems
(c)
Grounding electrodes
(d)
Flaceways
(e)
Enclosures
(f)
Equipment
SUBMITTALS
1.2
A.
General:
1)
Submittals shall be made on all items in this section and shall be in accordance with the
General Conditions.
B.
Product Data: Submit manufacturer's technical product data, including specifications and
installation instructions, for each type of grounding system required. fuclude data
substantiating that materials comply with requirements.
C.
Submit wiring diagrams for electrical grounding and bonding work which indicates layout
of ground rings, location of system grounding electrode connections, routing of grounding
electrode conductors, also include diagrams for circuits and equipment grounding
connections.
D.
NotUsed.
E.
Submit product data for the following:
1)
TMGB busbar
2)
TGB busbar
3)
Equipment rack busbars
4)
Two hole and one hole lugs
5)
No. 3/0 AWG and No .. 6 AWG conductors
GROUNDING AND BONDING FOR COMMUNICATIONS
270526- 1
1.3
REFERENCES
A.
ANSI/TWElA-607 - Commercial Building Grounding and Bonding Requirements for
Telecommunications.
B.
All work and materials shall comply with the latest rules, codes and regulations, including
but not limited to the following:
1)
Occupational Safety and Health Act Standards (OSHA)
2)
NFPA 70 -National Electrical Code (NEC)
3)
ANSI/IEEE C-2 National Electrical Safety Code
4)
All other applicable Federal, State, and local laws and regulations.
C.
NFPA 70, Article 250 - Grounding
D.
IEEE Standard 142 (Green Book) Recommended Practice for Grounding of Industrial and
Commercial Power System.
E.
IEEE Standard 1100 Power and Grounding Sensitive Electronic Equipment.
1.4
BONDING & GROUNDING INFRASTRUCTURE
A.
IC (Interconnecting Bonding Conductor) (referred to in TWEIA-607 at the Bonding
Conductor for Telecommunications): The copper conductor that bonds the TMGB to the
service equipment (power) ground.
B.
TMGB (Telecommunications Main Grounding Busbar): A copper ground reference bus bar,
typically installed in the entrance facility or entrance room, and is bonded to the service
equipment (power) ground by the Interconnecting Bonding Conductor.
C.
TGB (Telecommunications Grounding Busbar): A copper ground reference busbar,
typically installed in telecommunication closets (TC) and is bonded to the TMGB by the
TBB. The TGB references metallic entities in the TC space to ground.
D.
TBB (Telecommunications Bonding Backbone): An insulated copper conductor extending
from the TMGB to each TGB.
E.
EK (Equipment Bonding Conductor): An insulated copper conductor that bonds metallic
items and equipment to the TMGB and TGB.
PART2.
2.1
PRODUCTS
MATERIALS
Refer to the General Conditions, Supplementary General Conditions, and Division-1
General Requirements.
A.
1)
Equipment Rack Busbars
(a)
2)
Acceptable Manufactures: Newton Instrument Company (Figure 4028) 1/4" x 1" x
19" rack ground bar detail, for equipment rack applications.
Other Ground Reference Busbars
(a)
Acceptable Manufactures: Newton Instrument Company (Figure 3059) 114" x 1" x
12" insulated copper bar, for miscellaneous applications.
GROUNDING AND BONDING FOR COMMUNICATIONS
270526-2
3)
Bonding Conductors
(a)
All bonding conductors shall be insulated copper. Exception is use of flat, braided,
aluminum ground straps utilized for bonding sections of aluminum cable tray.
(b)
Unless otherwise specified, size the conductors as required by NEC.
(c)
Unless otherwise specified, the TBB (Telecommunications Bonding Backbone) shall
be insulated, copper, No. 3/0 AWG.
(d)
Unless otherwise specified, the EK (Equipment Bonding Conductor) shall be greencolored insulation, copper, No. 6 AWG.
(e)
Bonding Conductor Terminations
B.
Acceptable Manufacturers: Thomas and Betts, ILSCO, or approved equal.
C
Acceptable materials:
2.2
1)
Two hole compression lugs: Thomas and Betts, "Two Hole Lugs Long Barrel Type"
color code blue (example catalogue No. 54816BE), high conductivity wrought copper,
electro tin plated, or approved equal.
2)
One hole compression lugs: Thomas and Betts, "Long Barrel One Hole Lugs" color
code blue (example catalogue No. 54905BE), high conductivity wrought copper, electro
tin plated, or approved equal.
GENERAL GROUNDING
A.
Manufacturers of grounding and bonding products and equipment shall be firms regularly
engaged in manufacture of these devices, of types, sizes, and ratings required, whose
products have been in satisfactory use in similar service for not less than five (5) years.
B.
Material and installation shall comply with NEC requirements as applicable to construction
and installation of electrical grounding equipment and systems.
C.
Material and installation shall comply with National Electrical Contractors Association's
"Standard of Installation" pertaining to the installation, grounding and bonding of electrical
systems, circuits and equipment.
D.
The Contractor shall provide electrical components which are UL-listed and labeled for
each particular installation.
E.
Except as otherwise indicated, provide electrical grounding and bonding systems indicated;
with assembly of materials, including, but not limited to, cables/conductors/wires,
connectors, solderless lug terminals, grounding electrodes and plate electrodes, bonding
jumper braid, surge arresters, and additional accessories needed for a complete and
operational installation. Where more than one type component product meets indicated
requirements, selection is Installer's Code-compliant option.
Where materials or
components are not indicated, provide products which comply with NEC, UL, and IEEE
requirements and with established industry standards for those applications indicated.
F.
Unless otherwise indicated, provide electrical grounding conductors for grounding system
connections that match power supply wiring materials and are sized according to NEC.
G.
All conduit systems, boxes, electrical equipment enclosures, motor frames, etc., shall be
grounded in accordance with the requirements of the National Electrical Code, local
authorities and as specified herein.
GROUNDING AND BONDING FOR COMMUNICATIONS
270526-3
H.
All grounding wires shall be copper and shall be sized in accordance with the latest edition
ofN.E.C.
I.
All outlet boxes and junction boxes, disconnects, etc. shall be grounded. The ground wire
terminal of each device shall be connected to the grounding conductor. All enclosures for
electrical distribution and controls, all metal equipment supports for electrical controls and
all similar items shall be connected to the grounding system.
J.
All cable lugs for terminating grounding conductors number 6 AWG and larger, and as
called for on drawings, shall be two hole hydraulic crimp compression type lugs connected
to cable with a hydraulic compression tool. Each lug shall be connected to grounding bar or
termination with two bolts plus "Belleville" type washers each side and nuts.
2.3
ELECTRICAL SYSTEM AND EQUIPMENT GROUNDING
A.
All products shall be UL listed and labeled.
B.
Ground conductors shall be 98% conductivity copper, either tinned bare or with green
THWN-2 insulation. Other conductor requirements shall be the same as described for low
voltage, 600 volt conductors.
C.
Ground Connections:
1)
Splices and Taps:
(a)
Thermoweld - utilize smokeless single shot exothermic connections for solid wire
inside. Standard exothermic process may be used outside.
(b)
Compression - Solid long barrel copper, compressed with appropriate tool
recommended by connector manufacturer. Use compression connections for stranded
wire only.
2)
2.4
Lugs:
(a)
Solid Wire- Use Thermoweld lug (smokeless inside) with two bolt tongue
(b)
Stranded Wire - Use solid long barrel copper sleeve, crimp type compression
connector, with two bolt tongue, compressed with appropriate tool recommended by
connector manufacturer.
3)
Thoroughly clean connection surfaces prior to installation of clamps and/or lugs.
4)
Where mechanical connections are unavailable, i.e. pipe clamps, et al, use bolted bronze
mechanical connectors. Do not use clip-on connections.
5)
Piping and conduit clamps: Use Bumdy "GAR" or Penn Union type GPL, (no
substitution unless accepted equivalent), size as required for piping
6)
Seal connections between dissimilar metals (i.e.: bronze to steel), with "No-OXID-A"
compound as manufactured by Dearborn Chemical Company.
INTERIOR EXPOSED GROUNDING CABLES
A.
All exposed ground conductors shall be green in color.
B.
All grounding conductors installed on cable tray or ladder rack shall be secured using the
"KC Stitch" with approved cloth string.
C.
Ground conductors connected to structure shall be connected with non-metallic approved
fasteners.
GROUNDING AND BONDING FOR COMMUNICATIONS
270526-4
D.
Reference section 260519 for conductor types used for exposed ground wires. Interior
telecommunications grounds shall not be ran in conduit and shall be fixed to the structure
with approved non-metallic straps.
GROUNDING ELECTRODE AND REFERENCE GROUND SYSTEM
2.5
A.
Ground Conductors
1)
B.
Interior (exposed):
shown.
Bare stranded tinned copper or green insulated copper, size as
Ground Connections
1)
Buried and/or concealed inside building: Thermoweld process.
2)
Interior Exposed wire connection requirements:
(a)
Solid Wire: Use smokeless thermolwelded connections for solid wire as shown.
(b)
Use Solid, long barrel copper connectors, compressed with
Stranded Wire:
Use compression
appropriate tool recommended by connector manufacturer.
connectors for stranded wire only.
(c)
Where exposed taps are made to stranded conductor interior ground rings, use
wrought copper, split C tap copper compression taps or accepted equivalent.
(d)
Lugs: Solid wire to bus- Use Thermolwelded copper lug with two bolt tongue
(e)
Stranded wire to bus - Use long barrel copper sleeve, two-hole compression
connector, with two bolt tongue
(f)
Piping Connections: Heavy cast bronze or copper equivalent to Bumdy GAR or Penn
Union GPL (no substitution)
(g)
Stranded wire to solid wire - use thermoweld connection
C.
Preparation and Seal: Clean all connection surfaces and coat connection surfaces with "NoOxide A" compound as manufactured by Dearborn Chemical Company.
D.
Install all compression connectors with hydraulic compression tools recommended by
manufacturer of connector to provide correct circumferential pressure. Provide embossing
die code to make a visible indication that a connector has been adequately compressed on
grounding conductor.
E.
Ground Busses: 114" thick solid, hard drawn copper drilled as shown. Provide 2" ± stand
off insulators, G.E. Benelex, (3/8" bolt size). Provide pre-drilled holes, to accommodate
3/8" bolts on 1" centers. See Details on drawing. Tighten screws and bolts for grounding
and bonding connectors and terminals according to manufacturer's published torquetightening values.
PART 3.
3.1
EXECUTION
EXAMINATION
A.
Examine areas and conditions under which electrical grounding and bonding connections
are to be made and notify Contractor in writing of conditions detrimental to proper
completion of work. Do not proceed with work until unsatisfactory conditions have been
corrected in a manner acceptable to Installer.
GROUNDING AND BONDING FOR COMMUNICATIONS
270526- 5
B.
Install electrical grounding and bonding systems as indicated, in accordance with
manufacturer's instructions and applicable portions of NEC, NECA's "Standard of
Installation", and in accordance with recognized industry practices to ensure that products
comply with requirements.
C.
Coordinate with other electrical work as necessary to interface installation of electrical
grounding and bonding system work with other work.
D.
Tighten grounding and bonding connectors and terminals, including screws and bolts, in
accordance with manufacturer's published torque tightening values for connectors and bolts.
Where manufacturer's torquing requirements are not indicated, tighten connections to
comply with tightening torque values specified in UL 486A to assure permanent and
effective grounding. Submit torque actual torque values to the Architect for approval.
3.2
INSTALLATION
A.
Bond ground conductors run in metal conduit to the conduit at all breaks and each end of
run with full size conductor.
B.
Coat all connections between dissimilar metals with "No-Oxid-A" compound as
manufactured by Dearborn Chemical Company.
C.
Bond all miscellaneous metal masses within 6' of the grounding conductor with #6 AWG
copper conductor as shown.
D.
In the Telecommunications Closets, Equipment Rooms, and Entrance Facilities provide all
local bonding as specified on the drawings and in the specifications.
E.
Ground electrical systems and equipment as required by code, utility, local ordinances, and
requirements herein.
F.
Cable connections and joints shall be provided per ANSI/TWEIA-607.
G.
Bonding conductors should be continuous and routed in a direct route to point of
termination.
H.
All insulated ground bars must be isolated from the structural support by a 2" minimum
separation, using manufacturer's recommended insulating stand-offs and hardware.
I.
Clean ground bars prior to terminating conductors.
J.
Label all telecommunications bonding conductors as close as possible to their termination
point.
K.
Bond all TGBs to the TMGB using conductor size specified.
L.
Bond the following to the TGB when present:
1)
Telecommunication panelboards: ACEG, if equipped, or its enclosure.
2)
TGBs within the same space
3)
TBBs terminated on the same floor to other TGBs
4)
Metallic equipment racks
5)
Cable Shields.
6)
All metal raceways and cable trays for telecommunications cabling extending from the
same room or space where the TGB is located.
GROUNDING AND BONDING FOR COMMUNICATIONS
270526-6
7)
M.
Others as identified on the Drawings.
EK BONDING CONDUCTORS SHALL BE TERMINATED WITH ONE-HOLE
COMPRESSION LUGS.
END OF SECTION
GROUNDING AND BONDING FOR COMMUNICATIONS
270526-7
THIS PAGE INTENTIONALLY LEFT BLANK
SECTION 271500- COMMUNICATIONS HORIZONTAL CABLING
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
SUMMARY
A.
Section Includes:
1.
2.
3.
4.
5.
6.
7.
8.
B.
Related Requirements:
1.
2.
1.3
UTP cabling.
OM3 50/125-micrometer, optical fiber cabling.
Coaxial cable.
Multiuser telecommunications outlet assemblies.
Cable connecting hardware, patch panels, and cross-connects.
Telecommunications outlet/connectors.
Cabling system identification products.
Cable management system.
Section 271300 "Communications Backbone Cabling" for voice and data cabling
associated with system panels and devices.
Section 280513 "Conductors and Cables for Electronic Safety and Security" for voice and
data cabling associated with system panels and devices.
DEFINITIONS
A.
BICSI: Building Industry Consulting Service International.
B.
Cross-Connect: A facility enabling the termination of cable elements and their interconnection
or cross-connection.
c.
EMI: Electromagnetic interference.
D.
IDC: Insulation displacement connector.
E.
LAN: Local area network.
F.
Outlet/Connectors: A connecting device in the work area on which horizontal cable or outlet
cable terminates.
G.
RCDD: Registered Communications Distribution Designer.
COMMUNICATIONS HORIZONTAL WIRING
271500- 1
H.
1.4
UTP: Unshielded twisted pair.
ADMINISTRATIVE REQUIREMENTS
A
Coordinate layout and installation of telecommunications
telecommunications and LAN equipment and service suppliers.
B.
Coordinate telecommunications outlet/connector locations with location of power receptacles at
each work area.
1.5
cabling
with
Owner's
ACTION SUBMITTALS
A
Product Data: For each type of product.
1.
For coaxial cable, include the following installation data for each type used:
a.
b.
c.
B.
Shop Drawings:
1.
2.
3.
System Labeling Schedules: Electronic copy of labeling schedules, in software and
format selected by Owner.
Cabling administration drawings and printouts.
Wiring diagrams to show typical wiring schematics, including the following:
a.
b.
c.
4.
C.
1.6
Nominal OD.
Minimum bending radius.
Maximum pulling tension.
Cross-connects.
Patch panels.
Patch cords.
Cross-connects and patch panels. Detail mounting assemblies, and show elevations and
physical relationship between the installed components.
Samples: For workstation outlets, jacks, jack assemblies, in specified finish, one for each size
and outlet configuration and faceplates for color selection and evaluation of technical features.
INFORMATIONAL SUBMITTALS
A.
Qualification Data: For Installer, qualified layout technician, installation supervisor, and field
inspector.
B.
NotUsed
C.
NotUsed.
COMMUNICATIONS HORIZONTAL WIRING
271500- 2
1.7
CLOSEOUT SUBMITTALS
A.
Maintenance Data: For splices and connectors to include in maintenance manuals.
B.
Software and Firmware Operational Documentation:
1.
2.
3.
4.
1.8
Software operating and upgrade manuals.
Program Software Backup: On magnetic media or compact disk, complete with data
files.
Device address list.
Printout of software application and graphic screens.
MAINTENANCE MATERIAL SUBMITTALS
A.
Not Used.
1.
2.
1.9
Not Used.
Not Used.
QUALITY ASSURANCE
A.
Installer Qualifications: Cabling Installer must have personnel certified by BICSI on staff.
1.
2.
3.
B.
Testing Agency Qualifications: An NRTL.
1.
1.10
A.
Layout Responsibility: Preparation of Shop Drawings and Cabling Administration
Drawings, Cabling Administration Drawings, and field testing program development by
anRCDD.
Installation Supervision: Installation shall be under the direct supervision of Registered
Technician Level2 Installer, who shall be present at all times when Work of this Section
is performed at Project site.
Testing Supervisor: Currently certified by BICSI as an RCDD to supervise on-site
testing.
Testing Agency's Field Supervisor:
supervise on-site testing.
Currently certified by BICSI as an RCDD to
DELIVERY, STORAGE, AND HANDLING
Test cables upon receipt at Project site.
1.
2.
Test optical fiber cables to determine the continuity of the strand end to end. Use optical
fiber flashlight or optical loss test set.
Test each pair ofUTP cable for open and short circuits.
COMMUNICATIONS HORIZONTAL WIRING
271500- 3
PART 2 -PRODUCTS
2.1
HORIZONTAL CABLING DESCRIPTION
A.
Horizontal cable and its connecting hardware provide the means of transporting signals between
the telecommunications outlet/connector and the horizontal cross-connect located in the
communications equipment room. This cabling and its connecting hardware are called a
"permanent link," a term that is used in the testing protocols.
1.
2.
3.
B.
TWEIA-568-B.l requires that a mtmmum of three telecommunications
outlet/connectors be installed for each work area.
Bridged taps and splices shall not be installed in the horizontal cabling.
Splitters shall not be installed as part of the optical fiber cabling.
The maximum allowable horizontal cable length is 295 feet (90 m}. This maximum allowable
length does not include an allowance for the length of 16 feet (4.9 m) to the workstation
equipment or in the horizontal cross-connect.
PERFORMANCE REQUIREMENTS
2.2
A.
General Performance: Horizontal cabling system shall comply with transmission standards in
TWEIA-568-B.l when tested according to test procedures of this standard.
B.
Surface-Burning Characteristics: Comply with ASTM E 84; testing by a qualified testing
agency. Identify products with appropriate markings of applicable testing agency.
1.
2.
Flame-Spread Index: 25 or less.
Smoke-Developed Index: 50 450 or less.
C.
Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFP A 70,
by a qualified testing agency, and marked for intended location and application.
D.
Grounding: Comply with J-STD-607-A.
2.3
UTPCABLE
A.
Manufacturers: Subject to compliance with requirements available manufacturers offering
products that may be incorporated into the Work include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
2.
3.
4.
C.
Berk-Tek; a Nexans company.
CommScope, Inc.
SYSTIMAX Solutions; a CommScope, Inc. brand.
Panduit Corp.
Description: 100-ohm, four-pair UTP, formed into
COMMUNICATIONS HORIZONTAL WIRING
271500- 4
1.
2.
3.
4.
Comply with ICEA S-90-661 for mechanical properties.
Comply with TWEIA-568-B.l for performance specifications.
Comply with TWEIA-568-B.2, Category 6.
Listed and labeled by an NRTL acceptable to authorities having jurisdiction as complying
with UL 444 and NFPA 70 for the following types:
a.
b.
2.4
Communications, Plenum Rated: Type CMP or MPP, complying with NFPA 262.
Communications, Limited Purpose: Type CMX; or MPP, CMP, MPR, CMR, MP,
MPG, CM, or CMG.
UTP CABLE HARDWARE
A.
Manufacturers: Subject to compliance with requirements, available manufacturers offering
products that may be incorporated into the Work include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
2.
3.
4.
Panduit Corp.
Berk-Tek; a Nexans company.
CommScope, Inc.
SYSTIMAX Solutions; a CommScope, Inc. brand.
C.
General Requirements for Cable Connecting Hardware: Comply with TWEIA-568-B.2, IDC
type, with modules designed for punch-down caps or tools. Cables shall be terminated with
connecting hardware of same category or higher.
D.
Connecting Blocks: 110-style IDC for Category 6. Provide blocks for the number of cables
terminated on the block, plus 25 percent spare. Integral with connector bodies, including plugs
and jacks where indicated.
E.
Cross-Connect: Modular array of connecting blocks arranged to terminate building cables and
permit interconnection between cables.
1.
F.
Number of Terminals per Field: One for each conductor in assigned cables.
Patch Panel: Modular panels housing multiple-numbered jack units with IDC-type connectors
at each jack for permanent termination of pair groups of installed cables.
1.
Number of Jacks per Field: One for each four-pair UTP cable indicated conductor group
of indicated cables, plus spares and blank positions adequate to suit specified expansion
criteria.
G.
Jacks and Jack Assemblies: Modular, color-coded, eight-position modular receptacle units with
integral IDC-type terminals.
H.
Patch Cords: Factory-made, four-pair cables in 36-inch 48-inch lengths; terminated with eightposition modular plug at each end.
COMMUNICATIONS HORIZONTAL WIRING
271500- 5
1.
2.
2.5
Patch cords shall have bend-relief-compliant boots and color-coded icons to ensure
Category 6 performance. Patch cords shall have latch guards to protect against snagging.
Patch cords shall have color-coded boots for circuit identification.
OPTICAL FIBER CABLE
A.
Manufacturers: Subject to compliance with requirements, available manufacturers offering
products that may be incorporated into the W orlc include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
2.
3.
4.
5.
6.
C.
Description: Multimode, OM3 50/125-micrometer, 12 -fiber, Armor, tight buffer, optical fiber
cable.
1.
2.
3.
4.
5.
6.
D.
Comply with ICEA S-83-596 for mechanical properties.
Comply with TIAIEIA-568-B.3 for performance specifications.
Comply with TIA-492AAAC for detailed specifications.
Listed and labeled by an NRTL acceptable to authorities having jurisdiction as complying
with UL 444, UL 1651, and NFPA 70 for the following types:
a.
Plenum Rated, Nonconductive: Type OFNP, complying with NFPA 262.
Maximum Attenuation: 3.0 dB/km at 850 nm; 1.0 dB/km at 1300 nm.
Minimum Modal Bandwidth: 160 MHz-km at 850 nm; 500 MHz-km at 1300 nm.
Jacket:
1.
2.
3.
2.6
Belden Inc.
Berk-Tek; a Nexans company.
CommScope, Inc.
Corning Cable Systems.
SYSTIMAX Solutions; a CommScope, Inc. brand.
Panduit Corp
Jacket Color: Aqua for 50/125-micrometer cable.
Cable cordage jacket, fiber, unit, and group color shall be according to TIA-598-C.
Imprinted with fiber count, fiber type, and aggregate length at regular intervals not to
exceed 40 inches.
OPTICAL FIBER CABLE HARDWARE
A.
Manufacturers: Subject to compliance with requirements, available manufacturers offering
products that may be incorporated into the Work include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
Belden Inc.
2.
Berk-Tek; a Nexans company.
3.
CommScope, Inc.
COMMUNICATIONS HORIZONTAL WIRING
271500- 6
4.
5.
6.
C.
Coming Cable Systems.
SYSTIMAX Solutions; a CommScope, Inc. brand.
Panduit Corp.
Cross-Connects and Patch Panels: Modular panels housing multiple-numbered, duplex cable
connectors.
1.
Number of Connectors per Field: One for each fiber of cable or cables assigned to field,
plus spares and blank positions adequate to suit specified expansion criteria.
D.
Patch Cords: Factory-made, dual-fiber cables in 36-inch lengths.
E.
Cable Connecting Hardware:
1.
2.
Comply with Optical Fiber Connector Intermateability Standards (FOCIS) specifications
ofTIA-604-2-B, TIA-604-3-B, and TWEIA-604-12. Comply with TWEIA-568-B.3.
Quick-connect, simplex and duplex, Type SC connectors. Insertion loss not more than
0.50 dB.
COAXIAL CABLE
2.7
A.
Manufacturers: Subject to compliance with requirements, available manufacturers offering
products that may be incorporated into the Work include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
2.
3.
4.
5.
Alpha Wire Company.
Belden Inc.
Coleman Cable, Inc.
CommScope, Inc.
Draka Cableteq USA.
C.
Cable Characteristics: Broadband type, recommended by cable manufacturer specifically for
broadband data transmission applications. Coaxial cable and accessories shall have 75-ohm
nominal impedance with a return loss of 20 dB maximum from 7 to 806 MHz.
D.
RG-6/U: NFPA 70, Type CATV or CM.
1.
2.
3.
4.
E.
No. 16 A WG, solid, copper-covered steel conductor; gas-injected, foam-PE insulation.
Double shielded with 100 percent aluminum-foil shield and 60 percent aluminum braid.
Jacketed with black PVC or PE.
Suitable for indoor installations.
NFPA and UL compliance, listed and labeled by an NRTL acceptable to authorities having
jurisdiction as complying with UL 1655 and with NFPA 70 "Radio and Television Equipment"
and "Community Antenna Television and Radio Distribution" Articles. Types are as follows:
1.
CATV Plenum Rated: Type CATVP, complying with NFPA 262.
COMMUNICATIONS HORIZONTAL WIRING
271500- 7
2.8
COAXIAL CABLE HARDWARE
A.
Manufacturers: Subject to compliance with requirements, available manufacturers offering
products that may be incorporated into the Work include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
2.
3.
c.
2.9
Emerson Network Power Connectivity Solutions.
Leviton Commercial Networks Division.
Siemon Co. (The).
Coaxial-Cable Connectors: Type BNC, 75 ohms.
TELECOMMUNICATIONS OUTLET/CONNECTORS
A.
Jacks: 100-ohm, balanced, twisted-pair connector; four-pair, eight-position modular. Comply
with TWEIA-568-B.l.
B.
Workstation Outlets: Three-port-connector assemblies mounted in single faceplate.
1.
2.
3.
Plastic Faceplate: High-impact plastic. Coordinate color with Section 262726 "Wiring
Devices."
Metal Faceplate: Stainless steel, complying with requirements in Section 262726
"Wiring Devices."
For use with snap-in jacks accommodating any combination of UTP, optical fiber, and
coaxial work area cords.
a.
4.
2.10
Flush mounting jacks, positioning the cord at a 45-degree angle.
Legend: Snap-in, clear-label covers and machine-printed paper inserts.
GROUNDING
A.
Comply with requirements in Section 260526 "Grounding and Bonding for Electrical Systems"
for grounding conductors and connectors.
B.
Comply with J-STD-607-A.
2.11
IDENTIFICATION PRODUCTS
A.
Comply with TWEIA-606-A and UL 969 for labeling materials, including label stocks,
laminating adhesives, and inks used by label printers.
B.
Comply with requirements in Section 260553 "Identification for Electrical Systems."
COMMUNICATIONS HORIZONTAL WIRING
271500- 8
2.12
CABLE MANAGEMENT SYSTEM
A.
Manufacturers: Subject to compliance with requirements, available manufacturers offering
products that may be incorporated into the Work include, but are not limited to, the following:
B.
Basis-of-Design Product: Subject to compliance with requirements, provide product indicated
on Drawings or comparable product by one of the following:
1.
2.
iTRACS Corporation, Inc.
TelSoft Solutions.
C.
Description: Computer-based cable management system, with integrated database and graphic
capabilities.
D.
Document physical characteristics by recording the network, TWEIA details, and connections
between equipment and cable.
E.
Information shall be presented in database view, schematic plans, or technical drawings.
1.
F.
System shall interface with the following testing and recording devices:
1.
2.
2.13
Microsoft Visio Professional or AutoCAD drawing software shall be used as drawing and
schematic plans software.
Direct upload tests from circuit testing instrument into the personal computer.
Direct download circuit labeling into labeling printer.
SOURCE QUALITY CONTROL
A.
Test UTP cables according to TWEIA-568-B.2.
B.
Test multimode optical fiber cables according to TIA-526-14-A and TWEIA-568-B.3.
c.
Factory-sweep test coaxial cables at frequencies from 5 MHz to 1 GHz. Sweep test shall test
the frequency response, or attenuation over frequency, of a cable by generating a voltage whose
frequency is varied through the specified frequency range and graphing the results.
D.
Cable will be considered defective if it does not pass tests and inspections.
E.
Prepare test and inspection reports.
PART 3 -EXECUTION
3.1
ENTRANCE FACILITIES
A.
Coordinate backbone cabling with the protectors and demarcation point provided by
communications service provider.
COMMUNICATIONS HORIZONTAL WIRING
271500- 9
WIRING METHODS
3.2
A.
Install cables in pathways and cable trays except within consoles, cabinets, desks, and counters.
Conceal pathways and cables except in unfinished spaces.
1.
2.
3.
Install plenum cable in environmental air spaces, including plenum ceilings.
Comply with requirements in Section 270528 "Pathways for Communications Systems."
Comply with requirements in Section 270536 "Cable Trays for Communications
Systems."
B.
Conceal conductors and cables in accessible ceilings, walls, and floors where possible.
C.
Wiring within Enclosures:
1.
2.
3.
3.3
Bundle, lace, and train conductors to terminal points with no excess and without
exceeding manufacturer's limitations on bending radii.
Install lacing bars and distribution spools.
Install conductors parallel with or at right angles to sides and back of enclosure.
INSTALLATION OF CABLES
A.
Comply with NECA 1.
B.
General Requirements for Cabling:
1.
2.
3.
Comply with TIA/EIA-568-B.l.
Comply with BICSI ITSIM, Ch. 6, "Cable Termination Practices."
Install 11 0-style IDC termination hardware unless otherwise indicated.
4.
Terminate conductors; no cable shall contain unterminated elements. Make terminations
only at indicated outlets, terminals, cross-connects, and patch panels.
Cables may not be spliced. Secure and support cables at intervals not exceeding 30
inches and not more than 6 inches from cabinets, boxes, fittings, outlets, racks, frames,
and terminals.
Install lacing bars to restrain cables, to prevent straining connections, and to prevent
bending cables to smaller radii than minimums recommended by manufacturer.
Bundle, lace, and train conductors to terminal points without exceeding manufacturer's
limitations on bending radii, but not less than radii specified in BICSI ITSIM, "Cabling
Termination Practices" Chapter. Install lacing bars and distribution spools.
Do not install bruised, kinked, scored, deformed, or abraded cable. Do not splice cable
between termination, tap, or junction points. Remove and discard cable if damaged
during installation and replace it with new cable.
Cold-Weather Installation: Bring cable to room temperature before dereeling. Heat
lamps shall not be used for heating.
In the communications equipment room, install a 10-foot- (3 ..m-) long service loop on
each end of cable.
Pulling Cable: Comply with BICSI ITSIM, Ch. 4, "Pulling Cable." Monitor cable pull
tensions.
5.
6.
7.
8.
9.
10.
11.
C.
UTP Cable Installation:
COMMUNICATIONS HORIZONTAL WIRING
271500-10
1.
2.
D.
Optical Fiber Cable Installation:
1.
2.
E.
Comply with TIA/EIA-568-B.2.
Do not untwist UTP cables more than 1/2 inch (12 mm) from the point of termination to
maintain cable geometry.
Comply with TIA/EIA-568-B.3.
Cable may be terminated on connecting hardware that is rack or cabinet mounted.
Open-Cable Installation:
1.
2.
3.
Install cabling with horizontal and vertical cable guides in telecommunications spaces
with terminating hardware and interconnection equipment.
Suspend UTP cable not in a wireway or pathway a minimum of 8 inches (200 mm) above
ceilings by cable supports not more than 60 inches (1524 mm) apart.
Cable shall not be run through structural members or in contact with pipes, ducts, or other
potentially damaging items.
F.
Group connecting hardware for cables into separate logical fields.
G.
Separation from EMI Sources:
1.
2.
Comply with BICSI TDMM and TIA-569-B for separating unshielded copper voice and
data communication cable from potential EMI sources, including electrical power lines
and equipment.
Separation between open communications cables or cables in nonmetallic raceways and
unshielded power conductors and electrical equipment shall be as follows:
a.
b.
c.
3.
Separation between communications cables in grounded metallic raceways and
unshielded power lines or electrical equipment shall be as follows:
a.
b.
c.
4.
Electrical Equipment Rating Less Than 2 kVA: A minimum of 5 inches (127
mm).
Electrical Equipment Rating between 2 and 5 kVA: A minimum of 12 inches (300
mm).
Electrical Equipment Rating More Than 5 kVA: A minimum of 24 inches (610
mm).
Electrical Equipment Rating Less Than 2 kVA: A minimum of 2-1/2 inches (64
mm).
Electrical Equipment Rating between 2 and 5 kVA: A minimum of 6 inches (150
mm).
Electrical Equipment Rating More Than 5 kVA: A minimum of 12 inches (300
mm).
Separation between communications cables in grounded metallic raceways and power
lines and electrical equipment located in grounded metallic conduits or enclosures shall
be as follows:
a.
Electrical Equipment Rating Less Than 2 kVA: No requirement.
COMMUNICATIONS HORIZONTAL WIRING
271500- 11
b.
c.
5.
6.
Electrical Equipment Rating between 2 and 5 kVA: A minimum of 3 inches (76
mm).
Electrical Equipment Rating More Than 5 kVA: A minimum of 6 inches (150
mm).
Separatio.n between Communications Cables and Electrical Motors and Transformers, 5
kVA or HP and Larger: A minimum of 48 inches (1200 mm).
Separation between Communications Cables and Fluorescent Fixtures: A minimum of 5
inches (127 mm).
FIRESTOPPING
3.4
A.
Comply with requirements in Section 078413 "Penetration Firestopping."
B.
Comply with TIA-569-B, Annex A, "Firestopping."
c.
Comply with BICSI TDMM, "Firestopping Systems" Article.
GROUNDING
3.5
A.
Install grounding according to BICSI TDMM, "Grounding, Bonding, and Electrical Protection"
Chapter.
B.
Comply with J-STD-607-A.
C.
Locate grounding bus bar to minimize the length of bonding conductors. Fasten to wall
allowing at least 2-inch (50-mm) clearance behind the grounding bus bar. Connect grounding
bus bar with a minimum No.4 AWG grounding electrode conductor from grounding bus bar to
suitable electrical building ground.
D.
Bond metallic equipment to the grounding bus bar, usmg not smaller than No. 6 A WG
equipment grounding conductor.
3.6
IDENTIFICATION
A.
Identify system components, wiring, and cabling complying with TIA/EIA-606-A. Comply
with requirements for identification specified in Section 260553 "Identification for Electrical
Systems."
1.
Color-code cross-connect fields. Apply colors to voice and data service backboards,
connections, covers, and labels.
B.
Using cable management system software specified in Part 2, develop Cabling Administration
Drawings for system identification, testing, and management. Use unique, alphanumeric
designation for each cable and label cable, jacks, connectors, and terminals to which it connects
with same designation. At completion, cable and asset management software shall reflect asbuilt conditions.
C.
Comply with requirements in Section 099123 "Interior Painting" for painting backboards. For
fire-resistant plywood, do not paint over manufacturer's label.
COMMUNICATIONS HORIZONTAL WIRING
271500-12
D.
Paint and label colors for equipment identification shall comply with TWEIA-606-A for
Class 2 Class 3 Class 4 level of administration, including optional identification requirements of
this standard.
E.
Cable Schedule: Post in prominent location in each equipment room and wiring closet. List
incoming and outgoing cables and their designations, origins, and destinations. Protect with
rigid frame and clear plastic cover. Furnish an electronic copy of final comprehensive
schedules for Project.
F.
Cabling Administration Drawings: Show building floor plans with cabling administration-point
labeling. Identify labeling convention and show labels for telecommunications closets,
backbone pathways and cables, entrance pathways and cables, terminal hardware and positions,
horizontal cables, work areas and workstation terminal positions, grounding buses and
pathways, and equipment grounding conductors. Follow convention of TWEIA-606-A.
Furnish electronic record of all drawings, in software and format selected by Owner.
G.
· Cable and Wire Identification:
1.
2.
3.
4.
Label each cable within 4 inches (100 mm) of each termination and tap, where it is
accessible in a cabinet or junction or outlet box, and elsewhere as indicated.
Each wire connected to building-mounted devices is not required to be numbered at
device if color of wire is consistent with associated wire connected and numbered within
panel or cabinet.
Exposed Cables and Cables in Cable Trays and Wire Troughs: Label each cable at
intervals not exceeding 15 feet (4.5 m).
Label each terminal strip and screw terminal in each cabinet, rack, or panel.
a.
b.
5.
H.
Identification within Connector Fields in Equipment Rooms and Wiring Closets: Label
each connector and each discrete unit of cable-terminating and connecting hardware.
Where similar jacks and plugs are used for both voice and data communication cabling,
use a different color for jacks and plugs of each service.
Labels shall be preprinted or computer-printed type with printing area and font color that
contrasts with cable jacket color but still complies with requirements in TWEIA-606-A.
1.
3.7
Individually number wiring conductors connected to terminal strips, and identify
each cable or wiring group being extended from a panel or cabinet to a buildingmounted device shall be identified with name and number of particular device as
shown.
Label each unit and field within distribution racks and frames.
Cables use flexible vinyl or polyester that flex as cables are bent.
FIELD QUALITY CONTROL
A.
Testing Agency: Engage a qualified testing agency to perform tests and inspections.
B.
Manufacturer's Field Service: Engage a factory-authorized service representative to test and
inspect components, assemblies, and equipment installations, including connections.
COMMUNICATIONS HORIZONTAL WIRING
271500- 13
C.
Perfonn the following tests and inspections:
1.
2.
3.
4.
Visually inspect UTP and optical fiber cable jacket materials for NRTL certification
markings. Inspect cabling terminations in communications equipment rooms for
compliance with color-coding for pin assignments, and inspect cabling connections for
compliance with TWEIA-568-B.l.
Visually confirm Category 6, marking of outlets, cover plates, outlet/connectors, and
patch panels.
Visually inspect cable placement, cable termination, grounding and bonding, equipment
and patch cords, and labeling of all components.
Test UTP copper cabling for DC loop resistance, shorts, opens, intermittent faults, and
polarity between conductors. Test operation of shorting bars in connection blocks. Test
cables after termination but not cross-connection.
a.
5.
Test instruments shall meet or exceed applicable requirements in TIAIEIA-568B.2. Perform tests with a tester that complies with performance requirements in
"Test Instruments (Nonnative)" Annex, complying with measurement accuracy
specified in "Measurement Accuracy (Informative)" Annex. Use only test cords
and adapters that are qualified by test equipment manufacturer for channel or link
test configuration.
Optical Fiber Cable Tests:
a.
b.
Test instruments shall meet or exceed applicable requirements in TIA/EIA-568B.l. Use only test cords and adapters that are qualified by test equipment
manufacturer for channel or link test configuration.
Link End-to-End Attenuation Tests:
1)
2)
3)
One hundred percent of the cable's fiber count shall be tested with an
Optical Time Domain Reflectometer (OTDR) at 850 nm and 1300 nm in
addition; an Optical Loss Test Set (OLTS) shall be used to test the fiber.
The contractor shall provide the Engineer with up to five copies of any
software required for viewing electronic files of the OLTS and OTDR
traces. Use a EXPO FTB-500 or equal OTDR meter and a Fluke DTX-CLT
or equal OLTS meter.
All test equipment shall be factory certified within the last year. The
Contractor shall provide copies of the certification 10 days prior to testing.
Test results will be recorded on a form supplied by the Contractor and
approved by the Engineer, with data compiled and printed through the meter
manufacture's software. No additional alternation using software from the
Contractor beyond this software will be allowed. Prior to testing the
Contractor shall submit a sample form to the Engineer. Completed test
forms on each fiber shall be handed over to the Engineer. At a minimum,
test results shall show the following:
a)
b)
c)
d)
e)
Cable and fiber identification
Operator name
Engineer
Date and Time
Setup and test parameters including wavelength, pulse width, range,
scale and ambient temperature.
COMMUNICATIONS HORIZONTAL WIRING
271500- 14
f)
g)
4)
5)
6)
7)
8)
9)
6.
Test for each outlet. Perform the following tests according to TIA/EIA-568-B.1
and TIA/EIA-568-B.2:
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
8.
OTDR testing shall use a launch and receiving cables minimum 500 meters
or greater than the dead zone for the OTDR used for this test.
All fiber connectors must be cleaned and checked for dirt, scratches or chips
before installed in adapters and testing. All dust covers must be installed
after testing is complete.
The objective for all fiber optic cable is to have a maximum attenuation of
3.0 dB/km at 850 nm and 1.0 dB/km at 1300 nm when measured bidirectionally with an OTDR or OTLS. Fibers that exceed the max
attenuation loss specification will be identified as Out Of Specification
(OOS) and subject to penalties of $150.00 of each OOS trace.
The objective for each connector is an averaged loss value of0.25 dB or less
when measured with an OTDR at 850 nm and 1300 nm. Fibers not meeting
the max loss of 0.5 dB average 0.25 dB (no negative losses will be accepted)
specification will be identified as Out Of Specification (OOS) and subject to
penalties of $150.00 of each OOS trace.
The objective for each splice is an averaged loss value of 0.07 dB or less
when measured bi-directionally with an OTDR at 850 nm and 1300 nm.
Fibers not meeting the 0.10 dB or less specification will be identified as Out
Of Specification (OOS) and subject to penalties of $150.00 of each OOS
trace.
Remove malfunctioning units, replace with new units, and retest as specified
above.
UTP Performance Tests:
a.
7.
Test results for OTDR test averaged for total fiber trace, splice
loss/gain (dB), connector loss (dB), all events greater than .05 dB,
measured length from cable markings and total length from OTDR.
Test results for attenuation test including measured cable length
(cable marking) total length (from OTDR test) number of splices
(from as-builts) and total link attenuation versus allowed attenuation.
Wire map.
Length (physical vs. electrical, and length requirements).
Insertion loss.
Near-end crosstalk (NEXT) loss.
Power sum near-end crosstalk (PSNEXT) loss.
Equal-level far-end crosstalk (ELFEXT).
Power sum equal-level far-end crosstalk (PSELFEXT).
Return loss.
Propagation delay.
Delay skew.
Optical Fiber Cable Performance Tests: Perform optical fiber end-to-end link tests
according to TIA/EIA-568-B.l and TIA/EIA-568-B.3.
Coaxial Cable Tests: Conduct tests according to Section 274133 "Master Antenna
Television System."
COMMUNICATIONS HORIZONTAL WIRING
271500- 15
9.
Final Verification Tests: Perform verification tests for UTP systems after the complete
communications cabling and workstation outlet/connectors are installed.
a.
b.
Voice Tests: These tests assume that dial tone service has been installed. Connect
to the network interface device at the demarcation point. Go off-hook and listen
and receive a dial tone. If a test number is available, make and receive a local,
long distance, and digital subscription line telephone call.
Data Tests: These tests assume the Information Technology Staff has a network
installed and is available to assist with testing. Connect to the network interface
device at the demarcation point. Log onto the network to ensure proper connection
to the network.
D.
Document data for each measurement. Data for submittals shall be printed in a summary report
that is formatted similar to Table 10.1 in BICSI TDMM, or transferred from the instrument to
the computer, saved as text files, and printed and submitted.
E.
End-to-end cabling will be considered defective if it does not pass tests and inspections.
F.
Prepare test and inspection reports.
3.8
SOFTWARE SERVICE AGREEMENT
A.
Technical Support: Beginning with Substantial Completion, provide software support for 2
years.
B.
Upgrade Service: Update software to latest version at Project completion. Install and program
software upgrades that become available within two years from date of Substantial Completion.
Upgrading software shall include operating system. Upgrade shall include new or revised
licenses for use of software.
1.
3.9
Provide 30 days' notice to Owner to allow scheduling and access to system and to allow
Owner to upgrade computer equipment if necessary.
DEMONSTRATION
A.
Train Owner's maintenance personnel in cable-plant management operations, including
changing signal pathways for different workstations, rerouting signals in failed cables, and
keeping records of cabling assignments and revisions when extending wiring to establish new
workstation outlets
END OF SECTION 271500
COMMUNICATIONS HORIZONTAL WIRING
271500- 16
SECTION 272500- CABLE TRAYS FOR COMMUNICATIONS SYSTEMS
PART 1- GENERAL
1.1
SUMMARY
A.
1.2
This Section includes steel cable trays and accessories.
SUBMITTALS
A.
Product Data: Include data indicating dimensions and finishes for each type of cable tray
indicated.
B.
Shop Drawings: Show fabrication and installation details of cable trays, including sections of
components and attachments to other construction elements. Designate components and
accessories, including clamps, brackets, hanger rods, splice-plate connectors, expansion~oint
assemblies, straight lengths, and fittings.
1.
C.
1.3
NotUsed
NotUsed.
QUALITY ASSURANCE
A.
Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70,
Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for
intended use.
B.
Comply with NFPA 70.
PART 2 -PRODUCTS
2.1
MANUFACTURERS
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
3.
4.
5.
2.2
Cooper B-Line, Inc.
GS Metals Corp.; GLOBETRAY Products.
MONO-SYSTEMS, Inc.
Cablofil.
MPHusky.
MATERIALS AND FINISHES
A.
Cable Trays, Fittings, and Accessories: Steel, complying with NEMA VE 1.
1.
2.
B.
Factory-standard primer, and powder coated black; with cadmium-plated hardware
according to ASTM B 766.
Electrogalvanized before fabrication, complying with ASTM B 633; with hardware
galvanized according to ASTM B 633.
Cable Trays, Fittings, and Accessories: Aluminum, complying with NEMA VE 1, Aluminum
Association's Alloy 6063-T6 for rails, rungs, and cable trays, and Alloy 5052-H32 or
Alloy 6061-T6 for fabricated parts; with chromium-zinc, ASTM F 1136 splice-plate fasteners,
bolts, and screws.
CABLE TRAYS FOR COMMUNICATION SYSTEMS
272500- 1
C.
Sizes and Configurations: Refer to the cable tray schedule on drawings for specific
requirements for types, materials, sizes, and configurations.
1.
2.3
Center-hanger supports may be used only when specifically indicated.
CABLE TRAY ACCESSORIES
A.
Fittings: Tees, crosses, risers, elbows, and other fittings as indicated, of same materials and
finishes as cable tray.
B.
Barrier Strips: Same materials and finishes as cable tray.
c.
Cable tray supports and connectors, including bonding jumpers, as recommended by cable tray
manufacturer.
D.
All components shall be by one manufacturer.
PART 3- EXECUTION
3.1
INSTALLATION
A.
Comply with recommendations in NEMA VE 2. Install as a complete system, including all
necessary fasteners, hold-down clips, splice-plate support systems, barrier strips, hinged
horizontal and vertical splice plates, elbows, reducers, tees, and crosses.
B.
Remove burrs and sharp edges from cable trays.
C.
Fasten cable tray supports to building structure.
1.
2.
3.
4.
5.
Design each fastener and support to carry load indicated by seismic requirements.
Place supports so that spans do not exceed maximum spans on schedules.
Construct supports from channel members, threaded rods, and other appmienances
furnished by cable tray manufacturer. Arrange supports in trapeze or wall-bracket form as
required by application.
Support bus assembly to prevent twisting from eccentric loading.
Manufacture center-hung support, designed for 60 percent versus 40 percent eccentric
loading condition, with a safety factor of 3.
D.
Make connections to equipment with flanged fittings fastened to cable tray and to equipment.
Support cable tray independent of fittings. Do not carry weight of cable tray on equipment
enclosure.
E.
Make changes in direction and elevation using standard fittings.
F.
Make cable tray connections using standard fittings.
G.
Seal penetrations through fire and smoke barriers according to Division 07 Section "Penetration
Fires topping."
H.
Sleeves for Future Cables: Install capped sleeves for future cables through firestop-sealed cable
tray penetrations of fire and smoke barriers.
I.
Workspace: Install cable trays with enough space to permit access for installing cables.
J.
Install barriers 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 Vas required.
K.
After installation of cable trays is completed, install warning signs in visible locations on or
near cable trays,
L.
Install cables only when cable tray installation has been completed and inspected.
CABLE TRAYS FOR COMMUNICATION SYSTEMS
272500-2
M.
Fasten cables on horizontal runs with cable clamps or cable ties as recommended by
NEMA VE 2. Tighten clamps only enough to secure the cable, without indenting the cable
jacket. Install cable ties with a tool that includes an automatic pressure-limiting device.
N.
On vertical runs, fasten cables to tray every 18 inches. Install intermediate supports when cable
·
weight exceeds the load-carrying capacity of the tray rungs.
0.
Ground cable trays according to manufacturer's written instructions.
P.
Install an insulated equipment grounding conductor with cable tray, in addition to those required
byNFPA 70.
Q.
Cable trays shall be painted in exposed areas with color as directed by Architect.
3.2
FIELD QUALITY CONTROL
A.
After installing cable trays and after electrical circuitry has been energized, survey for
compliance with requirements. Perform the following field quality-control survey:
1.
2.
3.
4.
5.
6.
7.
B.
Visually inspect cable insulation for damage. Correct sharp comers, protuberances in
cable tray, vibration, and thermal expansion and contraction conditions, which may cause
or have caused damage.
Verify that the number, size, and voltage of cables in cable tray do not exceed that
permitted by NFPA 70. Verify that communication or data-processing circuits are
separated from power circuits by barriers.
Verify that there is no intrusion of such items as pipe, hangers, or other equipment that
could damage cables.
Remove deposits of dust, industrial process materials, trash of any description, and any
blockage of tray ventilation.
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.
Check for missing or damaged bolts, bolt heads, or nuts. When found, replace with
specified hardware.
Perform visual and mechanical checks for adequacy of cable tray grounding; verify that
all takeoff raceways are bonded to cable tray.
Report results in writing.
END OF SECTION 260536
CABLE TRAYS FOR COMMUNICATION SYSTEMS
272500-3
THIS PAGE INTENTIONALLY LEFT BLANK