260533.pdf

DCFT #082207

Hanson #03S1408GGB

260533-1 260533

RACEWAY AND BOXES FOR

ELECTRICAL SYSTEMS

DIVISION 26- ELECTRICAL

SECTION 260533 – RACEWAY AND BOXES FOR

ELECTRICAL SYSTEMS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

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

1.2 SUMMARY

A. This Section includes raceways, fittings, boxes, enclosures, cabinets for electrical wiring, sleeves for raceways, and grout.

B. Related Sections include the following:

1. Division 07 Section 078413 "Penetration Firestopping."

1.3 DEFINITIONS

A. EMT: Electrical metallic tubing.

B. FMC: Flexible metal conduit.

C. IMC: Intermediate metal conduit.

D. LFMC: Liquid tight flexible metal conduit.

E. RNC: Rigid nonmetallic conduit.

1.4 SUBMITTALS

A. Product Data: For raceways and fittings, hinged-cover enclosures, and cabinets.

B. Shop Drawings: For the following raceway components. Include plans, elevations, sections, details, and attachments to other work:

1. Custom enclosures and cabinets.

2. For boxes for underground wiring, including the following:

a. Conduit entry provisions, including locations and conduit sizes.

b. Cover design.

c. Grounding details.

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1.5 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 METAL CONDUIT AND TUBING

A. Manufacturers: Subject to compliance with requirements, the following are provided as examples of the salient characteristics to be found in the submitted product. Manufacturers offering products that may be incorporated into the Work include, but are not limited to, manufacturers specified:

1. AFC Cable Systems, Inc.

2. Alflex Inc.

3. Allied Tube & Conduit; a Tyco International Ltd. Co.

4. Anamet Electrical, Inc.; Anaconda Metal Hose.

5. Electri-Flex Co.

6. Manhattan/CDT/Cole-Flex.

7. O-Z Gedney; a unit of General Signal.

8. Wheatland Tube Company.

B. Rigid Steel Conduit: ANSI C80.1.

C. Aluminum Rigid Conduit: ANSI C80.5.

D. IMC: ANSI C80.6.

E. EMT: ANSI C80.3.

F. FMC: Zinc-coated steel.

G. LFMC: Flexible steel conduit with PVC jacket.

H. Fittings for Conduit (Including all Types and Flexible and Liquidtight), EMT, and Cable:

NEMA FB 1; listed for type and size raceway with which used, and for application and environment in which installed:

1. Conduit Fittings for Hazardous (Classified) Locations: Comply with UL 886.

2. Fittings for EMT: Steel, compression type.

I. Joint Compound for Rigid Steel Conduit or IMC: Listed for use in cable connector assemblies, and compounded for use to lubricate and protect threaded raceway joints from corrosion and enhance their conductivity.

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2.2 NONMETALLIC CONDUIT

A. Manufacturers: Subject to compliance with requirements, the following are provided as examples of the salient characteristics to be found in the submitted product. Manufacturers offering products that may be incorporated into the Work include, but are not limited to, manufacturers specified:

1. Anamet Electrical, Inc.; Anaconda Metal Hose.

2. Arnco Corporation.

3. CANTEX Inc.

4. CertainTeed Corp.; Pipe & Plastics Group.

5. Lamson & Sessions; Carlon Electrical Products.

6. RACO; a Hubbell Company.

B. RNC: NEMA TC 2, Type EPC-40-PVC, unless otherwise indicated.

C. Fittings for RNC: NEMA TC 3; match to conduit or tubing type and material.

2.3 BOXES, ENCLOSURES, AND CABINETS

A. Manufacturers: Subject to compliance with requirements, the following are provided as examples of the salient characteristics to be found in the submitted product. Manufacturers offering products that may be incorporated into the Work include, but are not limited to, manufacturers specified:

1. Cooper Crouse-Hinds; Div. of Cooper Industries, Inc.

2. EGS/Appleton Electric.

3. Erickson Electrical Equipment Company.

4. Hoffman.

5. Hubbell Incorporated; Killark Electric Manufacturing Co. Division.

6. O-Z/Gedney; a unit of General Signal.

7. RACO; a Hubbell Company.

8. Scott Fetzer Co.; Adalet Division.

9. Spring City Electrical Manufacturing Company.

10. Thomas & Betts Corporation.

11. Walker Systems, Inc.; Wiremold Company (The).

B. Sheet Metal Outlet and Device Boxes: NEMA OS 1.

C. Cast-Metal Outlet and Device Boxes: NEMA FB 1, ferrous alloy, Type FD, with gasketed cover.

D. Small Sheet Metal Pull and Junction Boxes: NEMA OS 1.

E. Hinged-Cover Enclosures: NEMA 250, Type 1, with continuous-hinge cover with flush latch, unless otherwise indicated:

1. Metal Enclosures: Steel, finished inside and out with manufacturer's standard enamel.

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F. Cabinets:

1. NEMA 250, Type 1, galvanized-steel box with removable interior panel and removable front, finished inside and out with manufacturer's standard enamel.

2. Hinged door in front cover with flush latch and concealed hinge.

3. Key latch to match panelboards.

4. Metal barriers to separate wiring of different systems and voltage.

5. Accessory feet where required for freestanding equipment.

2.4 SLEEVES FOR RACEWAYS

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

B. Coordinate sleeve selection and application with selection and application of firestopping specified in Division 07 Section 078413 "Penetration Firestopping."

2.5 GROUT

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

PART 3 - EXECUTION

3.1 RACEWAY APPLICATION

A. Comply with the following outdoor applications, unless otherwise indicated:

1. Exposed Conduit: Rigid steel conduit.

2. Underground Conduit: RNC, Type EPC-40-PVC, direct buried, or concrete encased.

3. Connection to Vibrating Equipment: LFMC.

4. Boxes and Enclosures, Aboveground: NEMA 250, Type 3R.

B. Comply with the following indoor applications, unless otherwise indicated:

1. Exposed, Not Subject to Physical Damage (above 4 ft (1.219 m) above finished floor):

EMT.

2. Exposed and Subject to Severe Physical Damage: Rigid steel conduit. Includes raceways in the following locations:

a. Conduits larger than 2 in. (50 mm) trade size, and all conduits in or below floor slabs, foundations, and in masonry and concrete walls.

b. Conduits for motor branch circuits.

c. Corridors used for traffic of mechanized carts, forklifts, and pallet-handling units

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d. Mechanical rooms.

e. All exposed conduits in areas to 4 ft (1,120 mm) above finished floor.

f. IMC may be used at Contractors option for rigid steel conduits above finished floor.

3. Concealed in Ceilings and Interior Gypboard Walls and Partitions: EMT.

4. Conduit systems for voice/data, fire alarm, and miscellaneous systems shall consist of

EMT in drop ceilings, gypboard walls and partitions, and exposed in roof structure supports.

5. Connection to Vibrating Equipment (Including Dry Type Transformers and Hydraulic, Pneumatic, Electric Solenoids, or Motor-Driven Equipment): LFMC.

6. Damp or Wet Locations: Rigid steel conduit.

7. Boxes and Enclosures: NEMA 250, Type 1, except use NEMA 250, Type 4, stainless steel in damp or wet locations.

C. Minimum Raceway Size: 3/4 in. (19 mm) trade size.

D. Raceway Fittings: Compatible with raceways and suitable for use and location:

1. Rigid and Intermediate Steel Conduit: Use threaded rigid steel conduit fittings, unless otherwise indicated.

E. Do not install aluminum conduits in contact with concrete.

3.2 INSTALLATION

A. Comply with NECA 1 for installation requirements applicable to products specified in Part 2 except where requirements on Drawings or in this Article are stricter.

B. All conduit shall be sized as indicated on the Drawings, or in conduit sizes not shown shall be in accordance with National Electrical Code. All conduit systems shall be mechanically and electrically continuous from source to all outlets and grounded in accordance with the National Electrical Code.

C. Conceal conduit wherever possible, or expose as shown or noted on the Drawings and as specified hereinafter. Run all exposed conduit parallel to building walls using right angle bends.

Exposed diagonal runs of conduit will not be permitted. Do not install conduit on roof surfaces unless specifically indicated on drawings.

D. Keep raceways at least 12 in. (300 mm) away from parallel runs of flues and steam or hot-water pipes, at 6 in. (150 mm) in cross runs, and at least 3 in. (75 mm) from cold water pipes. Install horizontal raceway runs above water and steam piping.

E. Complete raceway installation before starting conductor installation.

F. Support raceways as specified in Division 26 Section 260529 "Hangers and Supports for Electrical Systems."

G. Arrange stub-ups so curved portions of bends are not visible above the finished slab.

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H. Make changes in direction of runs with symmetrical bends or cast-metal fittings. Make field-made bends and offsets with conduit bending machine to avoid changing the internal diameter of the conduit and not damage its protective coating either inside or outside. Individual bends shall not exceed 90° and not more than 270° total bends will be allowed in any one conduit run.

Where more bends are necessary, and conduit runs exceed 150 lineal ft, install a suitable pullbox or junction box.

I. Raceways Embedded in Slabs:

1. Locate conduit installed in concrete slabs not to adversely affect the structural strength of the slab. Conduit shall not exceed 1 in. (25 mm) trade size in diameter. Run conduit parallel or at right angles to main reinforcement. Where at right angles to reinforcement, place conduit close to slab support. Do not stack.

2. The outside diameter of any conduit run in concrete slabs shall not exceed 1/3rd of the slab thickness.

3. Arrange raceways to cross building expansion joints at right angles with expansion fittings

4. Space conduit horizontally not closer than three diameters, except at stub up locations.

J. Threaded Conduit Joints, Exposed to Wet, Damp, Corrosive, or Outdoor Conditions: Apply listed compound to threads of raceway and fittings before making up joints. Follow compound manufacturer's written instructions.

K. Raceway Terminations at Locations Subject to Moisture or Vibration: Use insulating bushings to protect conductors, including conductors smaller than No. 4 AWG.

L. Ream conduit after threads are cut. Cur ends square, and butt solidly into couplings.

M. Install pull wires in empty raceways. Use polypropylene or monofilament plastic line with not less than 200-lb (90 kg) tensile strength. Leave at least 12 in. (300 mm) of slack at each end of pull wire.

N. Raceways for Optical Fiber and Communications Cable: Install raceways as follows:

1. 3/4 in. (19 mm) Trade Size for wall mounted telephones.

2. 1 in. (25 mm) Trade Size for desk (wall) mounted communication outlets.

3. Install with a maximum of two (2) 90° bends or equivalent for each length of raceway unless Drawings show stricter requirements. Separate lengths with pull or junction boxes or terminations at distribution frames or cabinets where necessary to comply with these requirements.

4. Outlet boxes shall be 4 in. by 4 in. by 2 1/8 in. (100 mm x 100 mm x 43.1 mm) minimum galvanized sheet metal with plaster rings.

O. Install raceway sealing fittings at suitable, approved, and accessible locations and fill them with listed sealing compound. For concealed raceways, install each fitting in a flush steel box with a blank cover plate having a finish similar to that of adjacent plates or surfaces. Install raceway sealing fittings at the following points:

1. Where conduits pass from warm to cold locations, such as boundaries of refrigerated spaces.

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2. Where otherwise required by NFPA 70.

P. Prevent accumulation of water, foreign mater or concrete in the conduits during the execution of the work. Temporarily plug conduit, blowout and swab before conductors are pulled.

Q. Expansion-Joint Fittings for RNC: Install in each run of aboveground conduit that is located where environmental temperature change may exceed 30°F, and that has straight-run length that exceeds 25 ft (7.6 m), or building expansion joints:

1. Install expansion-joint fittings for each of the following locations, and provide type and quantity of fittings that accommodate temperature change listed for location:

a. Outdoor Locations Not Exposed to Direct Sunlight: 125°F (70°C) temperature change.

2. Install fitting(s) that provide expansion and contraction for at least 0.00041 in. (0.06 mm) per foot of length of straight run per deg F of temperature change.

3. Install each expansion-joint fitting with position, mounting, and piston setting selected according to manufacturer's written instructions for conditions at specific location at the time of installation.

4. Provide conduit expansion joints at building expansion joints for conduit runs 1 1/2 in.

(37 mm) or larger. Provide conduit expansion joints or flexible conduit connection at building expansion joints less than 1 1/2 in (37 mm).

R. Flexible Conduit Connections: Use flexible conduit for recessed and semi recessed lighting fixtures, equipment subject to vibration, noise transmission, or movement; and for transformers and motors:

1. Use LFMC for final connections to motors, portable equipment and for equipment subject to vibration and noise transmission. For conduit sizes up to 1 in. (25 mm) trade size, LFMC shall be minimum length of 12 in. (300 mm) and a maximum length of 36 in.

(900 mm) and for conduit sizes above 1 in. (25 mm) trade size, LFMC shall be minimum length of 20 in. (500 mm) and a maximum length of 48 in. (1,200 mm).

2. Use FMC to connect fixture to adjacent junction boxes where not an integral part of the fixture. FMC shall be a minimum of 3/8 in. (9.5 mm) trade size, minimum 4 ft (1,200

mm) long and maximum of 6 ft (1,830 mm) long.

S. Fasten conduits to all sheet metal boxes and cabinets with two (2) locknuts in accord with NEC, where insulated bushings are used and where bushings cannot be brought into firm contact with the metal enclosures; otherwise, use at least one locknut and bushing.

T. Recessed Boxes in Masonry Walls: Saw-cut opening for box in center of cell of masonry block, and install box flush with surface of wall.

U. Seal each underground joint and make watertight.

V. Where building construction or other conditions make it impossible to use standard threaded couplings, install watertight threaded unions.

W. All conduits terminating at cable trays shall have anchor support and bushing at termination.

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3.3 INSTALLATION OF UNDERGROUND CONDUIT

A. Direct-Buried or Concrete-Encased Conduit:

1. Excavate trench bottom to provide firm and uniform support for conduit. Prepare trench bottom as specified in Division 31 Section 312000 "Earth Moving" for pipe less than 6

in. (150 mm) in nominal diameter.

2. Install backfill as specified in Division 31 Section 312000 "Earth Moving."

3. After installing conduit, backfill and compact. Start at tie-in point, and work toward end of conduit run, leaving conduit at end of run free to move with expansion and contraction as temperature changes during this process. Firmly hand tamp backfill around conduit to provide maximum supporting strength. After placing controlled backfill to within 12 in.

of finished grade, make final conduit connection at end of run and complete backfilling with normal compaction as specified in Division 31 Section 312000 "Earth Moving."

4. Install manufactured rigid steel conduit elbows for stub-ups at poles and equipment and at building entrances through the floor:

a. Couple steel conduits to RNC with adapters designed for this purpose, and encase coupling with 3 in. (75 mm) of concrete.

b. For stub-ups at equipment mounted on outdoor concrete bases, extend steel conduit horizontally a minimum of 60 in. (1,525 mm) from edge of equipment pad or foundation. Install insulated grounding bushings on terminations at equipment.

5. Burial depth for underground conduits shall be as follows from finish grade to top of conduit:

a. Primary conduits: 36 in. (900 mm) minimum.

b. Lighting conduits: 24 in. (600 mm) minimum.

c. Communication conduits: 24 in. (600 mm) minimum.

6. Conduit lines shall be laid with a minimum slope of 4 in. (100 mm) per 100 ft. (30.4 m) Ells and offsets shall be made with factory ells or with field bends made in accordance with conduit manufacturer's recommendations. The minimum bend radius shall be 36 in.

Otherwise, long sweep bends having a minimum radius of 25 ft (7.6 m) shall be used for a change of direction of more than 5°, either horizontally or vertically. Both curved and straight sections may be used to form long sweep bends as required.

7. Conduits shall be kept clean of concrete, dirt, or foreign substances during storage and construction. After conduit installation, a standard flexible mandrel shall be used for cleaning, followed by a brush with stiff bristles. Mandrel shall be at least 12 in. (300 mm) long and have a diameter 1/4 in. (6.4 m) less than the inside diameter of the conduit being cleaned. All obstructions in conduits shall be removed prior to pulling wires or final acceptance. Conduits unable to pass mandrel shall be replaced. All unused conduits shall be capped.

8. Conduits shall be marked with a 5-mil brightly colored tape not less than 3 in. (75 mm) wide and inscribed at not more than 10 ft (3.048 m) on centers identifying conduits.

Place tape approximately 12 in. below finish grade directly above conduits. Comply with Division 26 Section 260553 “Identification for Electrical Systems.”

9. Trench widths shall be held to a minimum.

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10. Examine all available site utility information in regard to existing utility lines and locate and protect existing lines. Repair all existing utility lines that are damaged by this construction.

11. All excavations shall be barricaded, lighted and protected during construction.

12. Contractor shall obtain approval from Contracting Officer for proposed schedules of any description of vehicular or pedestrian traffic for the installation of this work.

13. Contractor shall backfill all excavations.

3.4 RACEWAY SUPPORTS AND HANGARS

A. Coordinate raceway supports and hangars selection and application with Division 26 Section 260529 "Hangars and Supports for Electrical Systems."

B. Raceway Support and Hangers:

Material Maximum Spacing of Supports

1. 1/2 in. (13 mm) thru 1 in. (25 mm) trade size conduit 6 ft (1.828 m).

2. 1-1/4 in. (31.75 mm) thru 1-1/2 in. (38.1 m) trade size conduit 8 ft (2.438 m).

3. 2 in. (50 mm) to 4 in. (100 mm) trade size conduit 10 ft (3.048 m).

4. Flexible Metal Conduit 4-1/2 ft (1.372 m).

5. Cable Tray 10 ft (3.048 m).

C. Support rigid, IMC or EMT conduits within 3 ft (0.914 m) of every outlet box, junction box, pull box, cabinet or termination. Support flexible conduit within 12 in. (300 mm) on each side of every outlet box or fitting.

D. Support vertical runs of conduits at each floor level and at interval not to exceed 10 ft (3.048 m).

E. Support conduits by pipe straps, wall brackets, hangers, or ceiling trapeze. The use of perforated iron or wire for supporting conduits is prohibited. Fasten with wood screws or screw nails to wood; by toggle bolts on hollow masonry units, by concrete inserts, or expansion bolts on concrete or spring-tension or threaded C-clamps for rigid steel conduits on steel. Do not weld conduits or pipe straps to steel structures unless specifically indicated.

F. The load applied to fasteners shall not exceed one-third the proof test load of the fasteners.

G. Fasteners attached to concrete shall be vibration and shock resistant.

H. In partitions of light steel construction, use sheet metal screws.

I. In suspended-ceiling construction, spring steel fasteners to separate supports shall be used for the support of conduits serving lighting branch circuit conduits. No conduits may be supported from the ceiling suspension system.

J. Where two (2) or more conduits one in. trade size or larger run parallel, trapeze hangers may be used consisting of threaded solid rods, washers, nuts and galvanized "L" angle or channel iron.

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Individually fasten conduits to the cross member of every other trapeze hanger with one hole straps or clamp backs with proper size bolts, washers and nuts. When adjustable trapeze hangers are used, use U-bolt type clamps at end of conduit runs, at each elbow and at each third intermediate hanger to fasten each conduit.

K. Make hangers of durable materials suitable for the application involved. Applied loads shall not exceed one-third of their loading capacity.

L. Fabricate all screws, bolts, washers and miscellaneous hardware used for conduit supports from rust-resisting metal. Trapeze hangers shall have hanger assemblies protected with galvanized finish.

3.5 SLEEVE INSTALLATION FOR ELECTRICAL PENETRATIONS

A. Coordinate sleeve selection and application with selection and application of firestopping specified in Division 07 Section 078413 "Penetration Firestopping."

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

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

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

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

F. Extend sleeves installed in floors 2 in. (50 mm) above finished floor level.

G. Size pipe sleeves to provide 1/4 in. (6.4 mm) annular clear space between sleeve and raceway

H. Seal space outside of sleeves with grout for penetrations of concrete and masonry and with approved joint compound for gypsum board assemblies.

I. Interior Penetrations of Non-Fire-Rated Walls and Floors: Seal annular space between sleeve and raceway, using joint sealant appropriate for size, depth, and location of joint. Refer to Division 07 Section 079200 "Joint Sealants" for materials and installation.

J. Fire-Rated-Assembly Penetrations: Maintain indicated fire rating of walls, partitions, ceilings, and floors at raceway penetrations. Install sleeves and seal with firestop materials. Comply with Division 07 Section 078413 "Penetration Firestopping."

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

L. Aboveground, Exterior-Wall Penetrations: Seal penetrations using sleeves and mechanical sleeve seals. Select sleeve size to allow for 1 in. (25 mm) annular clear space between pipe and sleeve for installing mechanical sleeve seals.

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M. Underground, Exterior-Wall Penetrations: Install cast-iron "wall pipes" for sleeves. Size sleeves to allow for 1 in. (25 mm) annular clear space between raceway and sleeve.

3.6 FIRESTOPPING

A. Apply firestopping to electrical penetrations of fire-rated floor and wall assemblies to restore original fire-resistance rating of assembly. Firestopping materials and installation requirements are specified in Division 07 Section 078413 "Penetration Firestopping."

3.7 PROTECTION

A. Provide final protection and maintain conditions that ensure coatings, finishes, and cabinets are without damage or deterioration at time of Substantial Completion:

1. Repair damage to galvanized finishes with zinc-rich paint recommended by manufacturer.

2. Repair damage to PVC or paint finishes with matching touchup coating recommended by manufacturer.

3.8 SPECIAL INSTALLATION

A. Hazardous Locations.

1. Perform all work in hazardous locations as defined by the NEC in strict accordance with the NEC for the particular "Class," and "Group" of hazardous locations involved or indicated on the drawings Provide conduit and cable seals in accordance with the NEC.

END OF SECTION 260533