SECTION RACEWAYS

Transcription

1 SECTION RACEWAYS PART 1 GENERAL 1.1 SYSTEM DESCRIPTION A. Provide a complete raceway system suitable for receiving wire and cable and continuous from outlet to outlet. System shall be complete with all necessary pull and junction boxes, bushings, couplings and other fittings. 1.2 RELATED WORK A. The Contractor shall refer to Division 1 and other specification sections for requirements related to LEED certification of this project. It is recognized that this project is being submitted for certification under the LEED for Homes program and all products, materials and methods shall conform to applicable requirements QUALITY ASSURANCE A. Current editions of the following applicable standards, specifications and codes shall govern the work herein: B. Underwriters Laboratories, Inc. (UL) 1, 6, National Electrical Manufacturers Association (NEMA) FB SUBMITTALS PART 2 PRODUCTS A. Submit manufacturers list for all raceways and fittings. 2.1 ACCEPTABLE MANUFACTURERS A. Rigid steel conduit, intermediate metal conduit and electrical metallic tubing: 1. Allied Tube and Conduit Corp. 2. Cerro Wire and Cable Corp. 3. Robroy Industries, Inc. 4. Triangle PWC Inc. 5. Wheatland Tube Co. B. Flexible metal conduit: 1. American Flexible Conduit Co., Inc. 2. Cerro Wire and Cable Corp. 3. Ettco Wire and Cable Corp. 4. Triangle PWC Inc. C. Liquid tight flexible metal conduit: 1. American Flexible Conduit Co., Inc. RACEWAYS

2 2. Anaconda Metal Hose. 3. International Metal Hose Co. 4. Universal Metal Hose Co. D. Rigid non-metallic conduit (PVC): 1. Carlon. 2. Highland Plastics Inc. 3. LCP Plastics Inc. E. Wireways (Troughs): 1. General Electric. 2. Hoffman Engineering Co. 3. Square D Co. 4. Westinghouse. F. Raceway fittings and accessories: 2.2 MATERIALS 1. Appleton Electric Co. 2. Bridgeport Fittings, Inc. 3. Crouse-Hinds Co. 4. O.Z. Electrical Mfg. Co., Inc. 5. The Thomas and Betts Co. A. Rigid steel conduit shall be full weight steel pipe, threaded, hot dipped galvanized or electro-galvanized with non-split, threaded steel or malleable iron fittings. B. Electrical metallic tubing shall be thin wall steel pipe, non-threaded, hot dipped galvanized or electro-galvanized with steel or die cast "concrete tight" or "rain tight" compression fittings. C. Flexible metal conduit shall be of one continuous length of galvanized, spirally wound steel strip with interlocking convolutions and interior surfaces free from burrs and sharp edges. Fittings for flexible metal conduit shall be steel or malleable iron with insulated throats and shall be one of the following types: 1. Wedge and screw type having an angular wedge fitting between the convolutions of the conduit. 2. Squeeze on clamp type having a bearing surface contoured to wrap around the conduit, and clamped by one or more screws. 3. Steel, multiple-point type, for threading into internal wall of the conduit convolutions. D. Liquid tight flexible metal conduit shall have an extruded PVC jacket. Fittings shall be the watertight type. E. Rigid non-metallic conduit shall be polyvinyl chloride, heavy wall, schedule 40 and shall be self extinguishing. Fittings shall be PVC with solvent as recommended by the manufacturer. RACEWAYS

3 F. Wireways shall be constructed of 16 gauge steel with a rust inhibiting phosphating coating and gray baked enamel finish. Cover shall be hinged, latching type or screw-on as shown. Sizes as shown. PART 3 EXECUTION 3.1 GENERAL A. Where specifically required by notes and/or schedules on the drawings conduit should be used for circuit runs. However it is allowable to use the cables specified in Section where allowable by Code and by other 16 Division Sections. B. Size all raceway as required by the National Electric Code. Minimum branch circuit homerun conduit size shall be 1/2". Minimum conduit size for all other branch circuits shall be 1/2". C. Raceway runs are shown diagrammatically and may be modified to suit field conditions, but the general arrangement shall be as shown. D. All raceways shall be installed to provide adequate grounding between all outlets and the established system ground. E. All raceways shall be installed with a minimum of 3" between raceway and water or waste piping and a minimum of 6" between raceway and any pipe line with a surface temperature of 200 o or higher. F. In general all raceways are to be concealed in finished rooms unless otherwise noted. G. All exposed raceways shall be installed parallel or perpendicular to floors, walls and ceilings. H. Conduit penetrations through fire rated walls, partitions, floors or ceilings shall be firestopped with fittings according to ASTM E-119 fire endurance and hose stream criteria for three hour rating. I. Electrical device and lighting outlets in mechanical equipment rooms shall be installed with exposed conduits after equipment ducts and piping are in place. Locate lighting fixture outlets to provide best lighting distribution. J. Conduit runs shall be installed with not more than four 90 o bends or more than 100 feet of straight conduit between pull boxes. K. On exposed conduit installations, provide conduit bodies or similar approved fittings where conduit direction changes and bends are not suitable. L. Connections between rigid conduit and sheet steel boxes and enclosures shall be made up with bushings and double lock-nuts. Bushings shall be screwed up tightly against ends before lock-nuts are set up. M. All raceways outdoors, underground, in concrete slabs, in damp locations or areas where condensation may be present shall be PVC with gasketed fittings and "O" rings, watertight wiring methods shall be used in these areas. Threads installed below grade RACEWAYS

4 shall be painted for corrosion resistance with "red lead" waterproofing. The rigid conduit and watertight wiring methods in this application. N. All empty conduits shall be installed with 1/8" nylon pull cords. O. All empty conduit left for future use shall be provided with end caps. P. The maximim thickness (diameter) of conduits installed in slab shall be limited to one third the thickness of the slab. 3.2 RIGID STEEL CONDUIT A. Shall be used in exterior walls, concrete slabs on grade, crawl spaces between floor slabs and grade, exposed exterior locations, hazardous locations, in mechanical equipment rooms direct buried and all conduits stubbed up through the floor slab for connection to equipment. B. All exposed conduit within 7 feet of the floor shall be rigid steel. C. Rigid steel conduit in concrete slabs shall have a maximum outside diameter of not more than 1/3 of the slab thickness. D. Rigid steel conduit in any concrete fill shall have a minimum of 1" cover. E. Rigid steel conduit used for direct burial shall be provided with two coats of asphaltium paint. Dry thoroughly between paintings and before backfilling. 3.3 ELECTRICAL METALLIC TUBING (EMT) A. Use only in dry locations, hung ceilings, hollow block walls and furred spaces. B. EMT may not be used imbedded in plaster, poured concrete, direct burial, exposed in mechanical equipment rooms, where rigid steel is specifically indicated or where not permitted by the National Electrical code. 3.4 FLEXIBLE METAL CONDUIT A. Shall be used between the rigid raceway system and all motors, rotating or vibrating equipment, equipment requiring minor adjustments in position, and transformer primary and secondary connections. B. Flexible metal conduit not less than 4' and not exceeding 6' in length may be used for final connections to lighting fixtures. C. Flexible metal conduit may be used within steel stud walls between outlets in the wall and between outlets and the rigid raceway leaving the wall. D. Use only flexible metal conduit and fittings approved for the purpose of grounding. E. When the total length of a flexible metal conduit in a circuit exceeds 6' or the circuit ampacity exceeds 20 amps, install a grounding wire. 3.5 LIQUID TIGHT FLEXIBLE METAL CONDUIT RACEWAYS

5 A. Use liquid tight flexible metal conduit where indicated or when flexible metal conduit is required in damp or wet locations, corrosive atmospheres or used in exterior building areas. Comply with the requirements for flexible metal conduit and make all fittings and couplings watertight. 3.6 RIGID NON-METALLIC CONDUIT (PVC) A. May be used only for locations shown on the drawings and where permitted by NEC. B. All PVC conduit installations shall be concrete encased, below concrete slab or below grade (minimum 12 ). Site work circuits shall be run in PVC conduit. C. All joints and connections shall be made using fittings designed for the purpose to be watertight. Bonds between fittings, fittings and conduit shall be made using solvent cement. D. Bends and cuts shall be made in accordance with the manufacturer's recommendations. E. Install a ground wire in all conduits used for power circuits, feeders, or service, sized according to the National Electrical Code. F. Mandrel and clean out each conduit using a swab one size less than the inside diameter of the conduit. G. Connection to steel conduits shall be made with adapters designed for that purpose. 3.7 WIREWAYS A. Wireways are to be used where indicated on the drawings and for mounting groups of safety switches and/or starters. B. Provide with conductor retaining snap-in spring clips every 4 feet, but not less than two clips per wireway when wireways are mounted in the vertical plane or when covers face downward. C. Wireways in building exterior locations shall be raintight construction. 3.8 CONDUIT SUPPORTS A. Individual pipe hangers, multiple (trapeze) pipe hangers, and riser clamps shall be provided as necessary to support conduits, and all parts and hardware shall be zinccoated throughout. All U-bolts, clamps, attachments, and other hardware necessary for hanger assembly, and for securing hanger rods and conduits shall be provided. Each multiple hanger shall be designed to support a load equal to or greater than the sum of the weights of the conduits, wire, and hanger itself. B. All EMT and conduits not embedded in concrete or masonry shall be securely and independently supported so that no strain will be transmitted to outlet box and pull box supports. Supports shall be rigid enough to prevent distortion of conduits during wire pulling. C. Individual horizontal conduits and EMT shall be supported by one-hole pipe straps or separate pipe hangers for sizes 1-1/2" and smaller, and by separate pipe hangers for RACEWAYS

6 larger sizes. Spring steel fasteners may be used in lieu of pipe straps or hangers for sizes 1-1/2" and smaller in dry locations only. Hanger rods used with spring steel fasteners shall be not less than 1/4" diameter steel with corrosion resistant finish. Spring steel fasteners shall be specifically designed for supporting single conduits or EMT. Wire shall not be used as a means of support. D. Where two or more horizontal conduits or EMT run parallel and at the same elevation, they shall be supported on multiple (trapeze) pipe hangers. Each conduit or EMT shall be secured to the horizontal hanger member by a U-bolt, one-hole strap or other specially designed and approved fastener. E. Branch circuit conduits and raceways above suspended ceilings may be supported from the floor construction above or from the main ceiling support members, however, the finished installation shall not intefere with the removability of ceiling panels. F. Rigidly mount raceways and supports to the building structure as follows: 3.9 ACCESSORIES 1. Toggle bolts on hollow masonry. 2. Expansion shields or inserts on concrete and brick. 3. Machine screws on metal. 4. Wood screws on wood. 5. Nails, rawl plugs, or wood plugs will not be permitted. A. Sleeves. 1. Provide sleeves for all conduit penetrations through walls, floors and roofs as follows: 3.10 FIELD QUALITY CONTROL A. Continuity Tests. a. Exterior non-membrane waterproofed walls shall be galvanized cast iron, galvanized steel or wrought iron sleeve with continuously welded center flange. b. Exterior membrane waterproofed walls, floors and roofs shall be galvanized cast iron, flashing flange and clamping ring similar to Josam No series. c. Exterior non-membrane waterproofed roofs shall be galvanized cast iron, flashing flange and clamping ring similar to Josam No series. d. Interior membrane waterproof floors shall be galvanized cast iron, flashing flange and clamping ring similar to Josam No series. 1. Test the resistance of all feeder conduits from service to point of final distribution using one conductor return to assure maximum of 25 ohms resistance. END OF SECTION RACEWAYS