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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 1 OF 20
NOVEMBER 2, 2012
SECTION 27 05 28
COMMUNICATIONS PATHWAYS
PART 1 GENERAL
1.1 SUMMARY
A. SCOPE
1. This section includes minimum requirements for the following:
a) Interior Horizontal Cabling Communication Pathways
b) Interior Backbone Cabling Communication Pathways
2. Minimum composition requirements and installation methods for the
following pathways:
a) Conduit
b) Innerduct
c) Sleeves
d) Cable tray
e) Cable hangers (JHooks)
f) Wireways and wire troughs
g) Floor Boxes
h) Outlet Boxes
3. Provide all labor, materials, tools and equipment required for the complete
installation of work called for in the contract documents.
4. Prior to installation and as part of the contract, relocate any device a distance of 6
feet in any direction at the request of the owner at no additional cost. This shall
include all necessary conduit/s, cable, raceways, cutting, painting and patching to
accomplish the modification. Also refer to Division 26 specifications.
1.2 QUALITY ASSURANCE
A. All pathways and associated equipment shall be installed in a neat and workmanlike
manner. All methods of construction that are not specifically described or indicated in
the contract documents shall be subject to the control and approval of the Owner's
Representative. Equipment and materials shall be of the quality and manufacture
indicated. The equipment specified is based upon the acceptable manufacturers listed.
Where "approved equal" is stated, equipment shall be equivalent in every way to that of
the equipment specified and subject to approval.
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 2 OF 20
NOVEMBER 2, 2012
B. Materials and work specified herein shall comply with the applicable requirements of:
1. National Electric Code (NFPA 70) including the following Articles:
a) 318 Cable Trays
b) 331 Electrical Nonmetallic tubing
c) 348 Electrical metallic tubing
d) 349 Flexible metallic tubing
e) 350 Flexible metal conduit
f) 351 – LiquidTight Flexible metal conduit and LiquidTight flexible
nonmetallic conduit.
g) 352A Surface Metal Raceways
h) 352B Surface Nonmetallic raceways
i) 353 – Multioutlet Assembly
j) 354 – Underfloor raceways
k) 362 Metal Wireways and nonmetallic Wireways
l) 370 Outlet, Device, Pull and Junction Boxes , Conduit Bodies and Fittings
m) 645 Information Technology Equipment
n) 770 Optical Fiber Cables and Raceways
o) 800 Communications Circuits
2. The following American National Standards Institute (ANSI) standards:
a) ANSIC80.3 Specification for Electrical Metal lic Tubing, Zinc
coated
b) ANISIC80.2 Specification for rigid steel co nduit, enameled
3. The following Telecommunication Industry Association (TIA) standards.
a) ANSI/TIA/EIA – 568C. Commercial Building Tel ecommunications
Cabling Standard
b) ANSI/TIA/EIA – 569B Commercial Building Stan dard for
Telecommunications Pathway and Spaces
c) EIA/TIA606A Administration Standard for the Telecommunications
Infrastructure of Commercial Buildings
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 3 OF 20
NOVEMBER 2, 2012
d) EIA/TIA607 –B Commercial Building Grounding and Bonding
requirements for Telecommunications
4. The following BICSI guidelines
a) BICSI Telecommunications Distribution Design Manual (9th edition)
b) BICSI Customer Owned Outside Plant Design Manual (2nd edition)
c) BICSI Telecommunications Cabling Installation Manual (2nd edition)
5. The following UL Standards:
a) UL 1, 2000 Flexible Metal Electrical Condui t
b) UL 3, 1999 Flexible Nonmetallic Tubing for Electric Wiring
c) UL 5, 1996 Surface Metal Electrical Raceway s and Fittings
d) UL 360, 1996 LiquidTight Flexible Steel Co nduit, Electrical
e) UL 514B, 1996 Fittings for Conduit and Outl et Boxes.
f) UL 797, 1997 Electrical Metallic Tubing
g) UL 870, 1995 Electrical Wireways, Auxiliary Gutters and Associated
Fittings
1.3 SUBMITTALS
A. Provide product data for the following:
1. Conduit
2. Sleeves
3. Cable tray
4. Cable hangers (JHooks)
5. Wireways and wire Troughs
6. Floor Boxes
7. Outlet Boxes
8. Surface raceways
9. Cable tray accessories and specialty fittings, including panel type connectors for
finished ends
10. EACH surface raceway entrance end fitting and each radius elbow / tee per T4
details drawing and this section
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 4 OF 20
NOVEMBER 2, 2012
11. Label each submittal with a specification section and a T4 drawing detail
reference
PART 2 PRODUCTS
2.1 CONDUIT
A. Rigid Galvanized Steel Conduit
1. Shall be hotdipped galvanized steel, includin g threads.
B. Electrical Metallic Tubing (EMT)
1. Electrical Metallic Tubing shall be electroga lvanized steel
2. Acceptable manufactures
a) Triangle
b) Wheatland Tube
c) Allied Tube
d) Steel Duct
e) LTV Steel
C. Flexible Metal Conduit
1. Flexible Metal Conduit shall only be permitted when used in the inside the
wall cavity only.
2. Flexible Metal Conduit shall be constructed of one continuous length of spirally
wound, interlocked, zinc coated strip steel. Interior surface shall be free from
burrs or sharp edges
3. Acceptable manufacturers
a) Anaconda
b) American Flexible Conduit Co.
c) OZ/Gedney
d) Thomas and Betts
D. Liquidtight Flexible Metal Conduit
1. Flexible Metal Conduit shall be constructed of one continuous length of spirally
wound, interlocking zinc coated strip steel. Interior surfaces shall be free from
burrs and sharp edges. Provide with a liquidtight jacket of flexible polyvinyl
chloride (PVC).
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 5 OF 20
NOVEMBER 2, 2012
2. Acceptable manufacturers:
a. Allied
b. American Flexible Conduit
c. Carlon
d. Thomas and Betts
E. Fittings
1. Rigid galvanized steel fittings shall be fully threaded and shall be of the same
material as the respective raceway system.
2. Fittings for electrical metallic tubing shall be single screw indenter fittings for
conduits up to 2" and double screw indenter fittings for conduits 2" and larger.
3. Fittings for flexible metal conduit shall be center stopped, insulated throat, U.L.
E11852 listed
4. Fittings for liquidtight flexible metal conduit shall have zinc plated steel ferrule,
compression type with sealing ring
5. Fittings for rigid nonmetallic conduit shall be solvent cemented in accordance
with the manufacturer's instructions
6. Connectors shall have insulated throat up to and including 1" size. For sizes 1
1/4" and larger, provide plastic insulating bushing.
7. Diecast or pressure cast fittings are not per mitted.
8. Provide conduit bodies types, shapes and sizes as required to suit application and
NEC requirements. Provide matching gasketed covers secured with corrosion
resistant screws.
9. Conduit bodies are allowed instead of changing directions in boxes (obtain
approval from construction manager).
10. Acceptable manufacturers
a) O.Z. Gedney
b) Steel City
c) Thoams and Betts
d) Copper CrouseHinds
e) Carlon
F. Raintight Fittings (Compression EMT)
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 6 OF 20
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1. Acceptable manufacturers: Bridgeport Fittings, OZ Gedney, Steel City/Thomas
and Betts.
2. Design makes:.
a). Bridgeport Fittings: 26xSRT Series coupler for 1” EMT trade size.
b) Bridgeport Fittings: 25XSRT Series connector for 1” EMT trade size.
G. Space Saver Connector Fittings
1. Rigid galvanized steel fittings shall be fully threaded and shall be of the same
material as the respective raceway system
2. Fittings for electrical metallic tubing shall be single screw indenter fittings for
conduits up to 2" and double screw indenter fittings for conduits 2" and larger
3. Diecast or pressure cast fittings are not permitte d
4. Provide space saver EMT conduit connectors, in compression or set screw type
as called for in the T4 detailed drawings for: cable tray, raceway entrance end
fittings, and backbox connections for communication cabling – to maximize the
cable bend radius, crosssectional area and cable f ill ratios
5. Acceptable manufacturers: Cooper CrouseHinds , Space Saver Series
6. Design make
a) #SSBC1xx Series (set screw)
b) #SSC1xx Series (compression)
H. Expansion Fittings
1. Provide expansion fittings with external grounding straps at building expansion
joints.
2. Galvanized steel expansion joints for RGS or EMT conduit
3. Provide a minimum of 4” movement in either direction.
4. Weatherproof for outdoor applications.
5. At expansion joints in concrete pours, provide Deflection/Expansion fittings
capable of movement of ¾” in all directions from the normal.
I. Waterproofing Seals
1. Provide watertight expanding linktype seals f or installation between the conduit
and the sleeve or core drilled hole.
2. Design Make: Link Seal, or approved equal
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 7 OF 20
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H. Pull and Junction Boxes
1. Shall be constructed of not less than 14 gauge galvanized steel with trim for flush
or surface mounting in accordance with the location to be installed. Provide
screwon type covers. Boxes installed in damp or we t locations shall be of rain
tight construction with gasketed cover and threaded conduit hubs. In no case
shall boxes be sized smaller than as indicated in Article 370 of the National
Electrical Code for conduit and conductor sizes installed. Boxes shall be NEMA
approved for the environmental condition of the location where they will be
installed.
I. Flush floor junction boxes
1. Flush floor junction boxes shall be recessed cover boxes designed for flush
mounting in masonry.
2. Provide checkered plate gasketed cover suitable for foot traffic.
2.2 SURFACE METALLIC RACEWAY
A Refer to pathway schedules on T2series for addi tional surface raceway sizes, cable fill
tables, and cable radius requirements.
B TYPE SR2 (V2400 series)
1. .875” H x 1.875”W
2. Metallic two piece raceway with single compartment.
3. Color shall be Ivory color and have a durable finish with a scratchresistant
surface that can be field painted.
4. Refer to T4Series Drawings for additional informat ion and requirements.
5. Provide the following fittings:
a) Entrance end fitting nominal maximum dimension s of 2.62”W x 2.25”H
x 3” L. and 1” conduit knockout.
b) Back entrance end fitting same as entrance end fitting with internal
radius.
c) Tee fittings to connect to SR3 (3000 Series) and SR4 (4000 Series)
raceway where T section to SR2 (2400 Series) has m aximum width equal
to SR2 raceway
d) Bridge fitting with radius for spanning existing raceways in varying widths
from ½” to 2.
e) Flat Internal and external elbows UL verified for a 2" [51mm] bend radius
and exceeding the recommendations of EIA/TIA 569A. Internal or
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 8 OF 20
NOVEMBER 2, 2012
external radius control must be provided. Derate fill capacities when
internal radius control is provided, as recommended by the manufacturer.
f) Surface 2” x 4” or 4” x 4” boxes, with 2.25” depth as called for
6. Design Make: Wiremold V2400 series raceway, V2475D series bridge fittings,
V2410 series entrance end fittings, V2415 T fittings.
7. CUSTOM FITTINGS Design Make: Wiremold per T4 d etail drawings.
8. Acceptable Manufacturers: Hubbell, MonoSystems or others as submitted by
contractor and preapproved by Owner.
C TYPE SR3 (V3000 Series)
1. 1.5” H x 2.75”W
2. Metallic two piece raceway with single compartment.
3. Color shall be Ivory color and have a durable finish with a scratchresistant
surface that can be field painted.
4. Refer to T4Series Drawings for additional inf ormation and requirements.
5. Provide the following fittings:
a) Entrance end fitting nominal maximum dimens ions of 2.75”W x 2”H x
2.125” L. and 1” conduit knockout.
b) Back entrance end fitting same as entrance end fitting with internal
radius.
c) Tee fittings to connect to SR2 (2400 Series) raceway where T section to
SR2 has maximum width equal to SR2 raceway
d) Flat Internal and external elbows UL verified for a 2" [51mm] bend radius
and exceeding the recommendations of EIA/TIA 569A using internal or
external radius components. Internal or external radius control must be
provided. Derate fill capacities when internal radius control is provided, as
recommended by the manufacturer.
6. Design Make: Wiremold V3000 series raceway, with V3011, V3010 and V3018
fittings.
7. CUSTOM FITTINGS
a) Design Make: Wiremold per T4 detail drawings.
8. Acceptable Manufacturers: Hubbell, MonoSystem s or others as submitted by
contractor and pre approved by Owner.
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CORNELL – NCP COMMUNICATIONS SYSTEM PATHWAYS
STANDARD SPECIFICATIONS 27 05 28 – PAGE 9 OF 20
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D. TYPE SR4 and SR4d (V4000 Series)
1. 1.75” H x 4.75”W
2. Metallic two piece raceway with single or divided compartment as called for on
plans.
3. Color shall be Ivory color and have a durable finish with a scratchresistant
surface that can be field painted.
4. Provide the following fittings:
a) Entrance end fitting nominal maximum dimens ions of 4.75”W x 2.75”H
x 6.5”L. and 1.25” conduit knockout.
b) Back entrance end fitting same as entrance end fitting with internal
radius.
c) T fittings to connect to SR2 (2400 Series) r aceway where T section to SR
2 has maximum width equal to SR2 raceway
d) Flat Internal and external elbows with fiber optic radius
5. Design Make: Wiremold V4000 Series raceway, with V4010, V4017FO,
V4015FO and V4011FO fittings.
6. CUSTOM FITTINGS
a) Design Make: Wiremold per T4 detail drawings.
7. Acceptable Manufacturers: Hubbell, MonoSystem s or others as submitted by
contractor and preapproved by Owner.
E. TYPE SR7 (V700 Series)
1. Onepiece raceway
2. Color shall be Ivory color and have a durable finish with a scratchresistant
surface that can be field painted.
3. Utilized for wall mounted phones and miscellaneous branch circuit power only.
4. Provide internal and external 90 degree fittings with radius.
5. Provide miscellaneous boxes, extension rings, fittings and supports designed and
manufactured by the raceway manufacturer as required making a complete job.
6. Design Make: Wiremold V700
7. Acceptable Manufacturers: Hubbell, MonoSystem s or others as submitted by
contractor and preapproved by Owner...
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STANDARD SPECIFICATIONS 27 05 28 – PAGE 10 OF 20
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2.3 SLEEVES
A. See EMT requirements
2.4 GROUNDING BUSHINGS
A. Shall be provided for all conduits 2” and larger and longer than 10ft and shall be
bonded to the MTGB or TGB in the TR.
1. Shall facilitate a bonding path for all Sleeves and conduits back to
Telecommunication Ground bar’s in each TR.
2. Bushing shall provide protection for cables from damage.
B. Design Make
1. Arlington
2.5 WIRE MESH CABLE TRAY
A Cable Tray Finish: Carbon Steel with Zink plating.
B. Cable tray will consist of continuous, rigid, welded steel wire mesh cable
management system, to allow continuous ventilation of cables and
maximum dissipation of heat, with UL Classified splices where tray acts as
Equipment Grounding Conductor (EGC). Wire mesh cable tray will have
continuous Safe/T/Edge T/welded top side wire to protect cable insulation
and installers.
C. Provide splices, supports, and other fittings necessary for a complete,
continuously grounded system.
1. Mesh: 2 x 4 inches (50 x 100 mm).
2. Straight Section Lengths: 118 inches (3,000 mm).
3. Wire Diameter: Patented design includes varying wire sizes to
meet application oad requirements; to optimize tray strength; and to
allow tray to remain lightweight.
4. Safe/T/Edge: Patented Safe/T/Edge technology on side wire to
protect cable insulation and installers’ hands.
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5. Fittings: Wire mesh cable tray fittings are field/fabricated from
straight tray sections, in accordance with manufacturer’s
instructions and Item 2.3.
6. CF Series Cable Tray Size:
7. Depth: Cable tray shall be available in the following depths:
a) [1 inch (30 mm)]
b) [2 inches (54 mm)]
c) [4 inches (105 mm)]
d) [6 inches (150 mm)]
8. Width: Cable tray width will be available in the following widths:
a) [2 inches (50 mm)]
b) [4 inches (100 mm)]
c) [6 inches (150 mm)]
d) [8 inches (200 mm)]
e) [12 inches (300 mm)]
f) [18 inches (450 mm)]
g) [20 inches (500 mm)]
h) [24 inches (600 mm)]
9. Length: Cable tray section length will be 118 inches (3000mm)
unless otherwise shown on drawings.
D. Support cable tray as recommended by manufacture. Provide a safety
loading factor of 1.5 for uniformly distributed loads when supported as a
simple span in accordance with the NEMA standard listed.
E. Refer to pathway schedules for Cable Tray sizing and types additional
requirements
F. Refer to program standard detail Drawing for additional Cable Tray details
and requirements
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G. Design Makes: Legrand Cablofil Wire Mesh
H. Acceptable Manufacturers:
1. Cooper B/line Flextray
2. Approved equal
2.6 ENCLOSED CABLE TRAY
A. Solid Bottom Cable Trays shall be one piece construction bottom and
sides. Provide all required fittings for a complete system. Refer to
drawings T4 Series detailed drawings for additional requirements
B. Standard length of 10’/0” per section.
C. All cable trays shall be provided with flanged lay/on covers. Covers shall
be a maximum of 5’ in length. Provide shorter sections of cover at beam
crossings and pull box connections.
D. Wrap around type bolted connector to connect tray sections.
E. Minimum inside radius of horizontal elbows shall be 12 in. Provide special
radius elbows where required for field conditions or as called for.
Horizontal and Vertical bends for solid bottom trays shall have solid bottoms
Support cable tray as recommended by manufacture. Provide a safety
loading factor of 1.5 for uniformly distributed loads when supported as a
simple span in accordance with the NEMA standard listed.
F. Cable tray, cover, and all supporting devices shall be painted to match
existing surroundings when exposed, Cable tray shall not be painted when
exposed in mechanical and Telecommunication Rooms (TR’s), as called
for on the T2 series drawings. When required, cable tray and cover shall
be painted by the manufacture with a baked on finish. Provide color
sample with submittal.
G. Provide panel connector type end fitting to finish open ends of cable trays
at Telecommunication Rooms
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H. Provide screw/on covers for vertical section of cable trays and secure
upon cable placement
I. Provide cable support mounting means in all vertical section of cable trays
J. Refer to T2/Series Drawing pathway schedules for Cable Tray sizing and
types additional requirements
K. Refer to AT/CU standard installation details for additional Cable Tray
details and requirements
L. Design Makes: LeGrand Fiber Trough Cable Tray, Wiremold SpecMate Series, or
Monno/Systems Steel L series for new cable.
M. Acceptable Manufacturers: Approved equal
2.7 CABLE HANGERS ( JHOOK)
A. Provide prefabricated, zinc coated, carbon steel hangers designed specifically for UTP
and Optical Fiber cable installations.
B. Hangers shall have open top, rolled edges and a 3” or 4” minimum
diameter loop.
C. Provide beam clamps, rod fasteners, flange clips and brackets as job
conditions require.
D. Design Make CADDY CAT CM
E. Refer to AT/CU standard installation details for additional Cable hanger
pathway (J/Hook) details and requirements
2.8 SUPPORTING DEVICES
A. Supports, support hardware and fasteners shall be protected with zinc coating or
treatment of equivalent corrosion resistance using approved alternative treatment, finish
or inherent material characteristic. Products used fin outdoor applications shall be hot
dipped galvanized.
B. Provide clevis hangers, riser clamps, conduit straps, threaded c clamps with retainers,
ceiling trapeze hangers, wall brackets and spring steel clamps as applicable.
C. 14 gauge UChannel systems with 9/16 inch diame ter holes at a minimum of 1 7/8
inches on center in the top surface. Provide fittings and accessories that match and mate
channel.
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D. Provide carbon steel or wedge or sleeve type expansion anchors, steel springhead
toggle bolts and heattreated steel power driven th readed stud fastening equipment as
required by construction types.
E. Provided field fabricated supporting devices such as angles, channels, pipe supports,
etc. All fabricated supports shall be of metal construction as called for in 2.1.
PART 3 EXECUTION
3.1 CONDUIT
A. Conduit:
1. Electrical Metallic Tubing, Rigid Metal Conduit and Flexible metal conduit is are
allowed Conduit types.
2. Install with a minimum of bends and offsets. Bends shall not kink or destroying
the interior cross section of the raceway. Factory made bends shall be used for
raceway’s 1" trade size and larger. Bends radius shall be 6 times the internal
diameter for conduit sizes up to 2 inches. A conduit greater than 2 inch shall have
bend radius at least 10 times the diameter of the conduit.
3. Runs exceeding 100 feet or 180 degrees total bends shall be broken with suitable
sized pull or splice boxes. (LB or similar conduit fittings are not acceptable for
runs of riser cables. Verify applicability before installing such fitting
4. Do not locate riser pull boxes at bends without prior review and approval by
owner. Where possible use instead sweeps for the bend and locate in a straight
pull nearby.
5. Conduit runs to work areas shall not loop through one communication outlet to
feed another outlet.
6. Conduits shall be sized to accept 50% future growth; sizing shall account for fire
code capacity restrictions.
7. Plug the ends of each roughedin raceway with an approved cap or disc to
prevent the entrance of foreign materials during construction.
8. Secure within three feet of each outlet box, junction box, cabinet or fitting.
9. Provide a poly pull line in all "Spare" or "Empty" conduit runs to facilitate future
installation of cables.
10. Install raceways in concrete floor slabs as follows:
a) All conduits in concrete floor slabs shall be rigid galvanized steel with
concrete tight threaded fittings.
b) Provide expansion fittings where conduits cross building expansion joints.
c) Install conduit below the reinforcing mesh.
d) Locate conduits to provide a minimum of 1” of concrete around conduit.
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e) Obtain approval from the Owner's Representative prior to installing
conduit larger than 1" trade size in concrete slabs.
f) Wherever a cluster of four(4) or more condui ts rise out of floor exposed,
provide neatly formed 4in. high concrete envelope, with chamfered edges,
around raceways.
11. Provide conduit supports based on the following table:
Conduit Trade
Size Type of Run
Horizontal
Spacing in
Feet
Vertical Spacing in
Feet
½”, ¾” Concealed 7 10
1”, 1 ¼” Concealed 8 10
1 ½”, & LARGER Concealed 10 10
½”, ¾” Exposed 5 7
1”, 1 ¼” Exposed 7 8
1 ½” & larger Exposed 10 10
12. Where conduits puncture roof, install pitch pockets as required in order that the
roof warranty is maintained.
13. Conduit System Installation:
a) Cable in exterior, above grade locations: Rigid Galvanized Steel
b) Interior locations: Electrical Metallic Tubing
c) Cable below grade: PVC Schedule 40
14. Identification: Clearly label conduit at exposed ends indicating closet or outlet
where conduit terminates and the length of the conduit. Label pull boxes
indicating destination of conduits entering and exiting.
15. Include intra and interbuilding raceways. I ncluding conduits, sleeves and trays
for the placement of cables from the communications center to communications
closets, from the communications center to the entrance room or space and from
communication center to communication center in different building in a campus
environment.
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B. Conduit fill shall be as follows:
Trade Size
Area of Conduit
(square inches)
1 Cable
53% Fill
(sq. in.)
2 Cables
31% Fill
(sq. in.)
3 Cables &
Over
40% Fill
(sq. in.)
¾” 0.53 0.28 0.16 0.21
1” 0.87 0.46 0.27 0.35
1 ¼” 1.51 0.80 0.47 0.60
1 ½” 2.05 1.09 0.64 0.82
2” 3.39 1.80 1.05 1.36
2 ½” 4.82 2.56 1.49 1.93
3” 7.45 3.95 2.31 2.98
3 ½” 9.96 5.28 3.09 3.98
4” 12.83 6.80 3.98 5.13
5” 20.15 10.68 6.25 8.06
C. Backbone pathways shall be in the form of 4” conduits or sleeves between the main
communication equipment rooms and spaces and closets shall be provided as shown on
drawings:
D. Fire stop all pathways as called for in 27 05 00.
E. All backbone conduits shall be marked with 1” reflective tape every 25 feet.
Coordinate color with owner.
F. Pull boxes shall be marked with 1” wide reflective tape.
G. Stub out conduits into closets only enough to attach connector and bushings, vertical
conduits shall rise a minimum of 6 inches above the finished floor.
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H. Bush all conduit ends.
I. Conduits shall be concealed except in the following areas:
1. Mechanical Rooms
2. Electric Rooms
3. Manufacturing areas
4. Garage or maintenance areas
5. Unfinished basements or crawl spaces
6. Telecommunications rooms
7. Utility chaseways
J. Do not install raceways adjacent to hot surfaces or in wet areas.
K. Install conduits to edges of access boxes so as to maximize the total number of conduits
that can be routed through the pull box.
L. Provide expansion fittings with external grounding straps at building expansion joints.
M. Do not install conduit horizontally in concrete or block partitions.
N. Arrange neatly to permit access to the raceway, outlet, pull, and junction boxes, and
work installed by other trades.
O. If it is necessary to burn holes through webs of beams or girders, call such points to the
attention of the Owner's Representative and receive written approval both as to location
and size of hole before proceeding with work. All holes shall be burned no larger than
absolutely necessary. If allowed, the contractor shall arrange for and receive a burn
permit per University standards, requirements or as directed.
P. Core drill, sleeve, and fire stop all penetrations through existing floors.
Q. Support all raceways with malleable iron pipe clamps or other approved method. In
exterior or wet locations, provide minimum ¼” air space between raceway and wall.
Secure raceway within 3 ft. of each outlet box, junction box, cabinet or fitting.
R. Install junction and pull boxes in readily accessible locations. Equipment, piping, ducts
and the like shall not block access to boxes. Provide all necessary junction or pull boxes
required due to field conditions and size as required by the National Electrical Code.
S. Conduits shall be installed with a pull string with a minimum test rating of 200lbs.
3.2 SLEEVES
A. Support, fire stop and size as per drawing
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3.3 CABLE TRAYS
A. Cable Tray routing shown on the plans is diagrammatical only. Contractor shall field
verify all routes and potential existing utility/structural conflicts. Contractor to verify all
major tiein points, floor penetrations, existing c eiling access panels, ceiling elevations,
existing mechanical ductwork and equipment, existing sleeves and corridor wall
penetrations that may conflict with the new cable tray installation, etc. prior to the start
of construction. Coordinate proposed routing changes and offsets with the owner in
advance. All routing changes shall be at no additional cost to the contract.
B. Hang Cable tray using threaded, galvanized rod hangers, with rods extended through
support steel and double nutted. Size support member within load rating of member
section; and without visible deflection. Install cable tray level and straight.
C. Provide seismic bracing as required by code.
D. Provide stiffeners to prevent lateral movement and stabilize cable tray. Provide
minimally one stiffener assembly per vertical support (threaded rod).
E. A minimum of 12” headroom shall be provided above all cable trays.
F A minimum of 18” side clearance shall be provided for all cable trays.
G. Provide aluminum body expansion connectors at building expansion joints. Minimum
4in. movements, greater if expansion movement cond itions warrant.
H. Provide external grounding strap at expansion joints, sleeves, crossovers and at other
locations where tray continuity is interrupted.
I. Provide necessary elbows, tees, crosses, risers, offsets, fittings, reducers, connectors,
clamps, rod suspension, trapeze hangers, etc., as required to make a complete job,
coordinate with the manufacturer.
J. Provide (1) 6” long piece of ½” EMT conduit or snap on covers on each threaded rod
hanger to prevent scoring of cable insulation when cable is pulled in.
3.4 CABLE HANGERS (JHOOKS)
A. Provide cable hangers a maximum of 3’ on center wherever cable tray or conduit is not
present for support low voltage cabling.
B. Ceiling ties and rods shall not be used to hang cable or cable supports without the
approval of the Owner.
C. Load hangers as recommended by the manufacturer. Provide hangers side by side on a
common bracket where cable quantities require.
D. Do not install cables loose above lockin type, drywall or plaster ceilings.
E. Cables shall be installed at least 3 in. above the ceiling tiles and shall not touch the
ceiling.
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F. Do not support cable from ceiling system tie wires or grid in fire rated systems.
G. Provide a minimum of 2 spare bracket mounted hangers in new construction.
3.5 FLOOR BOXES
A. Floor outlet boxes shall be installed flush with finished floor, adjust level and tilt as
required. Where finished floor is terrazzo, provide boxes specifically designed for
installation in terrazzo. Where floors are to receive carpet, provide floor outlet with
carpet flange.
B. Furniture layout. Provide coordination drawings for approval.
3.6 BOXES AND CABINETS
A. Consider location of outlets shown on drawings as approximate only. Study
architectural, electrical, process piping, mechanical, plumbing, structural, roughingin,
etc., drawings and note surrounding areas in which each outlet is to be located. Locate
outlet so that when fixtures, motors, cabinets, equipment, etc., are placed in position,
outlet will serve its desired purpose. Where conflicts are noted between drawings,
contact Owner's Representative for decision prior to installation.
B. Outlet boxes in separate rooms shall not be installed "backtoback" without the
approval of the Owner's Representative.
C. Outlet boxes shall be sized to accommodate the wiring device(s) to be installed.
D. Outlet boxes installed in plaster, gypsum board or wood paneled walls shall be installed
with raised plaster covers or raised tile covers.
E. Outlet boxes installed in tile, brick or concrete block walls shall be installed with extra
deep type raised tile covers or shall be 31/2" dee p boxes with square corners and
dimensions to accommodate conductors installed.
F. Surface ceiling mounted outlet boxes shall be minimum 4" square, 11/2" deep,
galvanized sheet metal.
G. Surface wall mounted metallic outlet boxes shall be cast type boxes having threaded or
compression type threadless hubs. Exterior boxes shall be cast type with threaded hubs
and gasketed cover plates secured by nonferrous sc rews.
H. Where structural or other interference prevent compliance with mounting heights listed,
consult Owner's Representative for approval to change location before installation.
I. Where communications outlets are shown on, behind, below or above furniture or
millwork. Verify the exact location and mounting height with the project coordinator.
The electrical contractor shall be responsible for moving all communications outlets
that are in conflict with furniture or millwork, including cutting, patching and painting,
at no cost to the owner
J. Pull boxes shall have a distance between each raceway entry inside the box and the
opposite wall of the box of at least 6 times the tradesize diameter of the largest
raceway, this distance being increased by the sum of the trade size diameters of the
other raceways on the same wall of the box and have a distance between the nearest
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edges of each raceway enclosing the same conductor of at least 6 times the trade size
diameter of the raceway or 6 times the trade size diameter of the larger raceway if they
are of different sizes.
K. Install outlet boxes as per sizes indicated on the drawings and in the specifications.
3.7 SUPPORTING DEVICES
A. Hangers and Supports:
1. Provide steel angles, channels and other materials necessary for the proper
support of wallmounted cabinets, racks, panels, et c.
2. Cabinets, large pull boxes, and cable support boxes shall be secured to ceiling
and floor slab and not supported from conduits. Small equipment boxes, etc., as
approved by Owner's Representative, may be supported on walls. Racks for
support of conduit and heavy equipment shall be secured to building construction
by substantial structural supports.
3.8 FURNITURE RACEWAYS
A. Furniture Pathways Shall comply with UL 1286 and NEC Article 605.
B. It shall be the contractors responsibility to verify the furniture layout and
communication outlet with respect to the furniture. Obtain approved shop drawings
from the architect detailing furniture heights, cable openings etc.. Prior to roughing in
the outlet box verify height and location for all communication outlets near furniture or
cabinetry. Boxes roughed in the wrong location shall be relocated at the contractors
expense.
C. Provide a concealed transition from outlet box to furniture.
3.9 GENERAL
A. Support raceways from building construction. Do not support raceways from
ductwork, piping, or equipment hangers.
B. Support outlet, pull, and junction boxes independently from building construction. Do
not support from raceways.
C. Coordinate all raceway runs with other trades.
D. All open raceways shall be installed a minimum of 6 in. away from any light fixture or
other source of EMI (Electromagnetic interference).
E. All horizontal pathways shall be bonded and grounded per the NEC Article 250.
F. In all cases horizontal pathways shall be sized for a minimum of 50% future growth.
END OF SECTION