0442 Section 270533 Conduits and Backboxes for Communications

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SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 1 OF 7

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PART1 GENERAL

1.1

SUMMARY

1.2

Section includes conduit and tubing, surface raceways, wireways, outlet boxes, pull and junction boxes, and handholes.

Related Sections:

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

Division 07 Section - Penetration Firestopping.

Section 26 05 03 - Equipment Wiring Connections.

Section 26 05 33 - Raceway and Boxes for Electrical Systems.

Section 26 05 34 - Floor Boxes for Electrical Systems.

Section 26 05 36 - Cable Trays for Electrical Systems.

Section 27 05 26 - Grounding and Bonding for Communications Systems.

Section 27 05 29 - Hangers and Supports for Communications Systems.

Section 27 05 36 - Cable Trays for Communications Systems.

Section 27 05 53 - Identification for Communications Systems.

Section 27 13 43 -Communications Services Cabling.

REFERENCES

1.3

American National Standards Institute:

1.

2.

ANSI C80.1 - Rigid Steel Conduit, Zinc Coated.

ANSI C80.3 - Specification for Electrical Metallic Tubing, Zinc Coated.

National Electrical Manufacturers Association:

1.

2.

NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

NEMA FB 1 - Fittings, Cast Metal Boxes, and Conduit Bodies for Conduit and

Cable Assemblies.

NEMA OS 1 - Sheet Steel Outlet Boxes, Device Boxes, Covers, and Box

Supports.

NEMA TC 2 - Electrical Polyvinyl Chloride (PVC) Tubing and Conduit.

NEMA TC 3 - PVC Fittings for Use with Rigid PVC Conduit and Tubing.

SYSTEM DESCRIPTION

Raceway and boxes located as indicated on Drawings, and at other locations required for splices, taps, wire pulling, equipment connections, and compliance with regulatory requirements. Raceway and boxes are shown in approximate locations unless dimensioned. Provide raceway to complete wiring system.

Underground More than 5feet outside Foundation Wall: Provide thickwall Schedule 40•80 nonmetallic conduit. Provide cast metal boxes or nonmetallic handhole.

Underground Within 5 feet from Foundation Wall: Provide rigid steel conduit. Provide cast metal or nonmetallic boxes.

In or Under Slab on Grade: Provide thickwall Schedule 40•80 nonmetallic conduit.

Provide rigid steel conduit sweeps.

Outdoor Locations, Above Grade: Provide rigid steel conduit. Provide cast metal outlet, pull, and junction boxes.

102313 PROJECT NO, BI-RT-844-CMR

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 2 OF 7

1.4

1.5

1.6

1.7

1.8

Concealed Dry Locations: Provide electrical metallic tubing. Provide sheet-metal boxes.

Provide flush mounting outlet box in finished areas. Provide hinged enclosure for large pull boxes.

Exposed Dry Locations: Provide electrical metallic tubing. Provide sheet-metal boxes.

Provide flush mounting outlet box in finished areas. Provide hinged enclosure for large pull boxes.

DESIGN REQUIREMENTS

A.

Minimum Raceway Size: 3/4 inch unless otherwise specified.

SUBMITTALS

A.

Wet and Damp Locations: Provide rigid steel conduit, electrical metallic tubing. Provide cast metal outlet, junction, and pull boxes. Provide flush mounting outlet box in finished areas.

Section 01 33 00 - Submittal Procedures: Submittal procedures.

6.

7.

8.

9.

3.

4.

5.

Product Data: Submit for the following:

1.

2.

Liquidtight flexible metal conduit.

Nonmetallic conduit.

Nonmetallic tubing.

Raceway fittings.

Conduit bodies.

Surface raceway.

Wi reway.

Pull and junction boxes.

Handholes.

Manufacturer's Installation Instructions: Submit application conditions and limitations of use stipulated by Product testing agency specified under Regulatory Requirements.

Include instructions for storage, handling, protection, examination, preparation, and installation of Product.

CLOSEOUTSUBMITTALS

A.

Section 01 70 00 - Execution and Closeout Requirements: Requirements for submittals.

Project Record Documents:

1.

Record actual routing of conduits larger than 2 inch.

2.

Record actual locations and mounting heights of outlet, pull, and junction boxes.

DELIVERY, STORAGE, ANDHANDLING

A.

Section 01 60 00 - Product Requirements: Product storage and handling requirements.

Protect conduit from corrosion and entrance of debris by storing above grade. Provide appropriate covering.

C.

Protect PVC conduit from sunlight.

COORDINATION

A.

Section 01 30 00 - Administrative Requirements: Coordination and project conditions.

102313 PROJECT NO. BI-RT-844-CMR

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 3 OF 7

B,

D,

Coordinate installation of outlet boxes for equipment oonneoted under Seotion 26 05 03,

Coordinate mountin9 heights, orientation and Iooations of outlets mounted above oounters, benohes, and baoksplashes,

PART 2 PRODUCTS

2.1

METAL CONDUIT

2.2

2.3

2.4

A.

Manufacturers:

1.

2.

Allied Tube and Conduit.

Western Tube and Conduit.

3.

4.

Wheatland Tube Company.

Substitutions: Section 01 60 00 - Product Requirements.

Rigid Steel Conduit: ANSI C80.1.

B.

C.

Fittings and Conduit Bodies: NEMA FB 1; all steel fittings.

LIQUIDTIGHT FLEXIBLE METAL CONDUIT

A.

B.

Manufacturers:

1.

2.

3.

Carlon Electrical Products.

Anamet Electrical.

Allied Tube and Conduit.

4.

Substitutions: Section 01 60 00 - Product Requirements.

Product Description: Interlocked steel construction with PVC jacket.

C.

Fittings: NEMA FB 1.

ELECTRICAL METALLIC TUBING (EMT)

A.

Manufacturers:

1.

2.

Allied Tube and Conduit.

Western Tube and Conduit.

3.

4.

Wheatland Tube Company.

Substitutions: Section 01 60 00 - Product Requirements.

B.

Product Description: ANSI C80.3; galvanized tubing.

C.

Fittings and Conduit Bodies: NEMA FB 1 ; steel, compression (damp locations), and set screw type.

SURFACE METAL RACEWAY

A.

B.

C.

Manufacturers:

1.

2.

3.

4.

Hubbell Wiring Devices.

Thomas & Betts Corp.

The Wiremold Co.

Substitutions: Section 01 60 00 - Product Requirements.

Product Description: Sheet metal channel with fitted cover, suitable for use as surface metal raceway.

Size: as indicated on drawings.

102313 PROJECT NO. BI-RT-844-CMR

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 4 OF 7

2.5

2.6

D.

E.

Finish: Manufacturers standard finish as selected by Architect.

Fittings, Boxes, and Extension Rings: Furnish manufacturer's standard accessories; match finish on raceway.

OUTLET BOXES

A.

B.

C.

Manufacturers:

1.

Erico Products.

2.

Raco.

3.

4.

Thomas & Betts Corp.

Substitutions: Section 01 60 00 - Product Requirements.

Sheet Metal Outlet Boxes: NEMA OS 1, galvanized steel.

1.

2.

Luminaire and Equipment Supporting Boxes: Rated for weight of equipment supported; furnish 1/2 inch male fixture studs where required.

Concrete Ceiling Boxes: Concrete type.

Cast Boxes: NEMA FB 1, Type FD, cast feralloy. Furnish gasketed cover by box manufacturer. Furnish threaded hubs.

B.

C.

D.

D.

Wall Plates for Finished Areas: As specified in Section 26 27 26.

E.

Wall Plates for Unfinished Areas: Furnish gasketed cover.

PULL AND JUNCTION BOXES

A.

Manufacturers:

1.

Carlon Electrical Products.

2.

3.

4.

Hubbell Wiring Devices.

Thomas & Betts Corp.

Substitutions: Section 01 60 00 - Product Requirements.

Sheet Metal Boxes: NEMA OS 1, galvanized steel.

Hinged Enclosures: As specified in Section 26 27 16.

Surface Mounted Cast Metal Box: NEMA 250, Type 4; flat-flanged, surface mounted junction box:

1.

Material: Galvanized cast iron.

2.

Cover: Furnish with ground flange, neoprene gasket, and stainless steel cover screws.

E.

Concrete Composite Handholes: Die-molded, concrete composite hand holes:

1.

Cable Entrance: Pre-cut 6 inch x 6 inch cable entrance at center bottom of each side.

2.

Cover: Concrete composite, weatherproof cover with nonskid finish.

PART 3 EXECUTION

3.1

EXAM INATION

A.

B.

Section 01 30 00 - Administrative Requirements: Coordination and project conditions.

Verify outlet locations and routing and termination locations of raceway prior to rough-in.

102313 PROJECT NO, BI-RT-844-CMR

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 5 OF 7

3.2

3.3

3.4

B.

C.

EXISTING WORK

A.

Remove exposed abandoned raceway, including abandoned raceway above accessible ceiling finishes. Cut raceway flush with walls and floors, and patch surfaces.

Remove concealed abandoned raceway to its source.

Disconnect abandoned outlets and remove devices. Remove abandoned outlets when raceway is abandoned and removed. Install blank cover for abandoned outlets not removed.

D.

E.

Maintain access to existing boxes and other installations remaining active and requiring access. Modify installation or provide access panel.

Extend existing raceway and box installations using materials and methods compatible with existing electrical installations, or as specified.

F.

Clean and repair existing raceway and boxes to remain or to be reinstalled.

INSTALLATION

B.

C.

F.

G.

H.

I.

J.

A.

B.

C.

D.

Identify raceway and boxes in accordance with Section 26 05 53.

Arrange raceway and boxes to maintain headroom and present neat appearance.

INSTALLATION - RACEWAY

A.

Ground and bond raceway and boxes in accordance with Section 26 05 26.

Fasten raceway and box supports to structure and finishes in accordance with Section

26 05 29.

D.

E.

Raceway routing is shown in approximate locations unless dimensioned. Route to complete wiring system.

Arrange raceway supports to prevent misalignment during wiring installation.

Support raceway using coated steel or malleable iron straps, lay-in adjustable hangers, clevis hangers, and split hangers.

Group related raceway; support using conduit rack. Construct rack using steel channel specified in Section 26 05 29; provide space on each for 25 percent additional raceways.

Do not support raceway with wire or perforated pipe straps. Remove wire used for temporary supports

Do not attach raceway to ceiling support wires or other piping systems.

Construct wireway supports from steel channel specified in Section 26 05 29.

Route exposed raceway parallel and perpendicular to walls.

Route raceway installed above accessible ceilings parallel and perpendicular to walls.

Route conduit under slab from point-to-point.

102313 PROJECT NO, BI-RT-844-CMR

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 6 OF 7

3.5

K.

L.

M.

N.

O.

P.

Maintain clearance between raceway and piping for maintenance purposes.

Maintain 12 inch clearance between raceway and surfaces with temperatures exceeding

104 degrees F.

Cut conduit square using saw or pipe cutter; de-burr cut ends.

Bring conduit to shoulder of fittings; fasten securely.

Join nonmetallic conduit using cement as recommended by manufacturer. Wipe nonmetallic conduit dry and clean before joining. Apply full even coat of cement to entire area inserted in fitting. Allow joint to cure for minimum 20 minutes.

Install conduit hubs or sealing Iocknuts to fasten conduit to sheet metal boxes in damp and wet locations and to cast boxes.

C.

D.

E.

Q.

Install no more than equivalent of three 90 degree bends between boxes. Install conduit bodies to make sharp changes in direction, as around beams. Install factory elbows for bends in metal conduit larger than 2 inch size.

Avoid moisture traps; install junction box with drain fitting at low points in conduit system.

R.

S.

T.

U.

Install fittings to accommodate expansion and deflection where raceway crosses seismic, control and expansion joints.

Install suitable pull string or cord in each empty raceway except sleeves and nipples.

Install suitable caps to protect installed conduit against entrance of dirt and moisture.

V.

Surface Raceway: Install flat-head screws, clips, and straps to fasten raceway channel to surfaces; mount plumb and level. Install insulating bushings and inserts at connections to outlets and corner fittings.

W.

Close ends and unused openings in wireway.

INSTALLATION - BOXES

A.

B.

F.

G.

Install wall mounted boxes at elevations to accommodate mounting heights as specified in section for outlet device.

Coordinate communications device locations with furniture plan and receptacle locations to accommodate the intended purpose prior to rough-in.

Adjust box location up to 10 feet prior to rough-in to accommodate intended purpose.

Orient boxes to accommodate wiring devices oriented as specified in Section 271343.

Install pull boxes and junction boxes above accessible ceilings and in unfinished areas only.

In Accessible Ceiling Areas: Install outlet and junction boxes no more than 6 inches from ceiling access panel or from removable recessed luminaire.

Locate flush mounting box in masonry wall to require cutting of masonry unit corner only.

Coordinate masonry cutting to achieve neat opening.

102313 PROJECT NO. BI-RT-844-CMR

SECTION 27 05 33

CONDUITS AND BACKBOXES FOR COMMUNICATIONS

PAGE 7 OF 7

3.6

3.7

3.8

M.

N.

O.

J.

K.

L.

H.

I.

Do not install flush mounting box back-to-back in walls; install with minimum 6 inches separation. Install with minimum 24 inches separation in acoustic rated walls.

Secure flush mounting box to interior wall and partition studs. Accurately position to allow for surface finish thickness.

Install stamped steel bridges to fasten flush mounting outlet box between studs.

Install flush mounting box without damaging wall insulation or reducing its effectiveness.

Install adjustable steel channel fasteners for hung ceiling outlet box.

Do not fasten boxes to ceiling support wires or other piping systems.

Support boxes independently of conduit.

Install gang box where more than one device is mounted together. Do not use sectional box.

P.

Install gang box with plaster ring for single device outlets.

INTERFACE WITH OTHER PRODUCTS

A.

B.

Install conduit to preserve fire resistance rating of partitions and other elements, using materials and methods in accordance with Division 07 Section "Penetration Firestopping".

Route conduit through roof openings for piping and ductwork or through suitable roof jack with pitch pocket.

C.

D.

Locate outlet boxes to allow luminaires positioned as indicated on Drawings.

Align adjacent wall mounted outlet boxes for switches, thermostats, and similar devices.

ADJUSTING

A.

Section 01 70 00 - Execution and Closeout Requirements: Testing, adjusting, and balancing.

Adjust flush-mounting outlets to make front flush with finished wall material.

B.

C.

Install knockout closures in unused openings in boxes.

CLEANING

Section 01 70 00 - Execution and Closeout Requirements: Final cleaning.

Clean interior of boxes to remove dust, debris, and other material.

Clean exposed surfaces and restore finish.

END OF SECTION

102313 PROJECT NO, BI-RT-844-CMR

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