16110 Final Raceways.pdf

Offutt Air Force Base

16110-1 (Repair Taxiway Circuits A & B)

(072060) 2009 by FEI

SECTION 16110

RACEWAYS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and other Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. All wiring shall be installed in continuous raceways as specified herein except where specifically noted otherwise.

B. Types of raceways in this section include the following:

1. Rigid metal conduit.

2. Rigid nonmetallic conduit.

3. Electrical Metallic Tubing.

4. High Density Polyethylene.

1.3 SUBMITTALS

A. Product Data: For raceway, fittings and solvent cement.

PART 2 - PRODUCTS

2.1 METAL CONDUIT AND TUBING

A. General: Provide metal conduit, tubing and fittings of types, grades, sizes and weights (wall thicknesses) for each service indicated. Where types and grades are not indicated, provide proper selection determined by Installer to fulfill wiring requirements and comply with applicable portions of

NEC for raceways.

B. Rigid Steel Conduit: Provide rigid steel, zinc-coated, threaded type conforming to ANSI C80.1 and UL

6. Provide zinc coating fused to inside and outside walls.

1. Rigid Metal Conduit Fittings: Rigid metal conduits shall have threaded couplings when installed in concrete or direct burial in the ground. Other installations in dry locations may be threadless rigid fittings.

2. PVC Externally Coated Rigid Steel Conduit: Provide rigid steel zinc-coated with additional external coating of PVC conforming to ANSI C80.1 and NEMA RN 1.

C. Electrical Metallic Tubing (EMT): Provide electrical metallic tubing conforming to ANSI C80.3 and UL

797.

1. EMT Fittings: Fittings for EMT shall be steel of the compression type. All EMT connectors shall be of the insulated throat type. Cast or indenter fittings are not acceptable. EMT connectors shall be fastened to box or enclosure with locknuts. Snap-in fittings are not acceptable.

16110-2 (Repair Taxiway Circuits A & B)

D. Conduit Bodies: Provide galvanized malleable iron conduit bodies of types, shapes and sizes as required to fulfill job requirements and NEC requirements. Construct conduit bodies with threaded-conduit-entrance ends, removable covers, either cast or of galvanized steel and corrosion-resistant screws.

2.2 NONMETALLIC CONDUIT

A. General: Provide nonmetallic conduit and fittings of types, sizes and weights as specified.

B. Rigid Nonmetallic Conduit:

1. Heavy Wall Conduit:

a. Schedule 40, 90 C, UL Rated, construct of polyvinyl chloride and conforming to NEMA

TC-2, for direct burial, or normal above ground use, UL Listed.

b. Schedule 40, 90C, UL Rated, Construct of High Density Polyethylene and conforming to NEMA TC-7 Smoothwall Coilable PE Electrical plastic conduit and UL 651 A & B.

C. Conduit and Tubing Accessories: Provide conduit and tubing duct accessories of types, sizes, and materials, complying with manufacturers published product information, which mate and match conduit and tubing.

PART 3 - EXECUTION

3.1 INSTALLATION OF RACEWAYS

A. General: Install raceways as indicated; in accordance with manufacturer's written installation instructions, and in compliance with NEC and NECA's "Standards of Installation". Install units plumb and level and maintain manufacturer's recommended clearances.

B. Coordinate with other work including wires/cables, boxes and panel work, as necessary to interface installation of electrical raceways and components with other work.

3.2 INSTALLATION OF CONDUITS

A. General: All conduits shall be concealed (direct buried) unless noted otherwise.

1. Mechanically fasten together metal conduits, enclosures, and raceways for conductors to form continuous electrical conductor. Connect to electrical boxes, fittings and cabinets to provide electrical continuity and firm mechanical assembly.

2. Avoid use of dissimilar metals throughout system to eliminate possibility of electrolysis. Where dissimilar metals are in contact, coat surfaces with corrosion inhibiting compound before assembling.

3. Install miscellaneous fittings such as reducers, chase nipples, 3-piece unions, split couplings, plugs, deflection and expansion couplings that have been specifically designed and manufactured for their particular application.

4. Use roughing-in dimensions of electrically operated unit furnished by supplier. Set conduit and boxes for connection to units only after receiving review of dimensions.

16110-3 (Repair Taxiway Circuits A & B)

B. Conduit Installation: Provide rigid conduit where embedded in concrete on or below grade, in direct contact with earth or fill below slab, wet locations, in sizes larger than 2-inches or installed outdoors.

Follow minimum requirements in other areas as follows:

1. Use rigid steel zinc-coated conduit in all locations where exposed unless noted otherwise on the drawings.

2. Use PVC coated rigid steel conduit and fittings where installed below grade and for stub-ups through equipment pads. Patch all nicks and scrapes in PVC coating after installing conduit.

3. Use steel zinc-coated EMT for raceway only where noted on the drawings.

4. Rigid Non-Metallic Conduits:

a. Rigid non-metallic conduits may be used below grade only unless noted otherwise on the drawings.

b. Rigid non-metallic conduits shall not be used for exposed stub-ups.

c. Make solvent cemented joints in accordance with recommendations of manufacturer.

d. Install rigid non-metallic conduits in compliance with NEC, local utility practices, and all other authorities having jurisdiction.

C. Cut conduits straight, properly ream, and cut threads for heavy wall conduit deep and clean. Use temporary closures to prevent foreign matter from entering raceways.

D. Field-bend conduit with benders designed for purpose so as not to distort nor vary internal diameter.

E. Size conduits to meet NEC requirements and as shown on drawings.

F. Fasten rigid conduit terminations in sheet metal enclosures with locknuts inside and outside enclosure.

G. Conduit terminations in wet locations shall be of the threaded hub type fittings UL Listed for use in wet locations.

H. Conduit shall be properly supported as specified herein and as required by NEC.

I. Use of running threads at conduit joints and terminations is prohibited. Where required, use 3-piece union.

J. Complete installation of electrical raceways before starting installation of cables/wires within raceways.

K. Conduits installed underground which extend through the foundation walls shall be sealed to prevent the entrance of moisture through the foundation walls. All conduits extending through the exterior walls of a building in areas below grade shall be provided with a hydrostatic seal such as Link Seal or equal.

L. Concealed Conduits:

1. Metallic raceways installed underground shall be PVC coated.

2. Install underground conduits minimum of 36-inches below finished grade.

M. Exposed Conduits:

16110-4 (Repair Taxiway Circuits A & B)

1. All exposed conduit shall be installed in a neat manner following the building lines. Horizontal runs shall be close to the ceiling and shall be installed above mechanical piping as much as possible. Single hung conduits shall be supported with strap or rod hangers, wire is not an acceptable hanger. Multiple hung conduits shall be strapped to the channel to hold it in place.

2. Install exposed conduits and extensions from concealed conduit systems neatly, parallel with or at right angles to walls of building.

3. Support exposed conduits by use of hangers, clamps or clips. Support conduits on each side of bends and on spacing not to exceed following: Up to 1-inch: 6-feet-0-inch; 1-1/4-inch and over: 8-feet-0-inch.

4. Run conduits for outlets on waterproof walls exposed. Set anchors for supporting conduit on waterproof wall in waterproof cement.

N. Conduit Fittings:

1. Construct locknuts for securing conduit to metal enclosure with sharp edge for digging into metal, and ridged outside circumference for proper fastening.

2. Plastic insulating bushings for terminating rigid conduits smaller than 1-1/4-inch are to have ribbed sides, with smooth upper edges to prevent injury to cable insulation.

3. Install metallic insulated type bushings for terminating rigid conduits 1-1/4-inch and larger.

Bushings are to have flared bottom and ribbed sides. Upper edge to have phenolic insulating ring molded into bushing.

4. Miscellaneous fittings such as reducers, chase nipples, 3-piece unions, split couplings, plugs, deflection and expansion couplings to be specifically designed for their particular application.

END OF SECTION