Youngstown State University

Transcription

1 SECTION RACEWAYS PART 1 - GENERAL SUMMARY A. This section includes raceways for electrical wiring. Types of raceways in this section include the following: 1. Flexible metal conduit 2. Liquid tight flexible conduit 3. Rigid metal conduit 4. Intermediate steel conduit 5. Wiremold 6. EMT electrical metallic tubing ANSI C80.3 B. The following Division 26 section contain requirements that relate to this section: 1. "Wires and Cables" for other wiring methods 2. "Supporting Devices" for other wiring methods 3. "Electrical Boxes and Fittings" for boxes used with conduit and tubing systems. C. Electrical components and installation shall comply with NFPA 70 "National Electrical Code", latest edition. NEMA COMPLIANCE A. Comply with applicable requirements of NEMA standards pertaining to raceways. 1. Rigid steel conduit ANSI C Intermediate steel conduit 3. Liquid tight flexible metal conduit and fittings U360 specifically approved for this raceway. 4. Flexible metal conduit U1 5. EMT electrical metallic tubing ANSI C80.3 B. Comply with applicable requirements of US standards pertaining to electrical raceway systems. Provide raceway products and components listed and labeled by UL, ETL, or CSA. PART 2 - PRODUCTS MANUFACTURERS A. Available manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated in the work if applicable include, but are not limited to, the following: 1. Conduit: Wheatland Allied LTV Triangle Project No. YSU

2 2. Conduit bodies: METAL CONDUIT AND TUBING Adalet-PLM American Electric Appleton Electric Co. Carlon Crouse-Hinds Division, Cooper Industries, Inc. Killark Electric Mfg. Co. O-Z/Gedney A. Rigid steel conduit: ANSI C80.1. B. Intermediate steel conduit: UL C. Electrical metallic tubing (EMT): ANSI C80.3 D. Liquidtight flexible metal conduit and fittings: UL360. Fittings shall be specifically approved for use with this raceway. E. Minimum conduit size shall be 3/4 inch trade size. NONMETALLIC CONDUIT AND DUCTS A. Rigid nonmetallic conduit (RNC): NEMA TC 2 and UL 651, schedule 40 or 80 PVC. B. PVC conduit and tubing fittings: NEMA TC 3; match to conduit or conduit/tubing type and material. C. PVC and ABS plastic utilities duct fittings: NEMA TC9; match to duct type and material. D. Liquidtight flexible nonmetallic conduit and fittings: UL Fittings shall be specifically approved for use with this raceway. E. Conduit, tubing, and duct accessories: types, sizes, and materials complying with manufacturer's published product information. Mate and match accessories with raceway. CONDUIT BODIES A. General: type, shapes, and sizes as required to suit individual applications and NEC requirements. Provide matching gasketed covers secured with corrosion-resistant screws. B. Metallic conduit and tubing: Use metallic conduit bodies. Use bodies with threaded hubs for threaded raceways. C. Conduit bodies 1 inch and smaller: Use bodies with compression-type EMT connectors for EMT. D. Nonmetallic conduit and tubing: Use nonmetallic conduit bodies conforming to UL 514 B. Project No. YSU

3 PART 3 - EXECUTION WIRING METHOD A. Outdoors: Use the following wiring methods: 1. Exposed: Galvanized rigid steel conduit. 2. Concealed: Galvanized rigid steel conduit. 3. Connection to vibrating equipment: Including transformers and hydraulic, pneumatic, or electric solenoid or motor-driven equipment: Liquidtight flexible metal conduit. 4. Indoors or outdoors: Connection to vibrating equipment and hydraulic, pneumatic, or electric solenoid or motor-driven equipment in moist or humid location or corrosive atmosphere, or where subject to water spray or dripping oil, grease, or water: Liquidtight flexible metal conduit. 5. Underground: PVC Schedule 40 encased in 6 inch concrete envelope (refer to duct bank details for requirements exceeding the 6 inches). Burial depth shall be a minimum of 36 below grade to top of concrete. Concrete shall be 3,500 PSI and red in color. Provide a metallic yellow CAUTION ELECTRICAL CONDUITS BELOW tape at 18 inches above the conduits C. Indoors: Use the following wiring methods: INSTALLATION 1. Connection to vibrating equipment: Including transformers and hydraulic, pneumatic or electric solenoid or motor-operated equipment: Liquidtight flexible metal conduit unless noted otherwise. 2. Concealed: Electrical metallic tubing with STEEL set screw fittings. 3. Exposed in equipment rooms: Electrical metallic tubing with STEEL set screw fittings. 4. Exposed to damage: Galvanized rigid steel conduit. A. General: Install electrical raceways in accordance with manufacturer's written installation instructions, applicable requirements of NEC, and as follows: B. Conceal all raceways unless indicated otherwise within finished walls and ceilings. Keep raceways at least 6 inches away from parallel runs of flues and steam or hot water pipes. Install raceways level and square and at proper elevations. C. Elevation of raceway: Coordinate the installation with all trades. D. Complete installation of electrical raceways before starting installation of conductors within raceways. E. Provide supports for raceways as specified elsewhere in Division 26. F. Prevent foreign matter from entering raceways by using temporary closure protection. Project No. YSU

4 G. Protect stub-ups from damage where conduits rise from floor slabs. Arrange so curved portion of bends is not visible above the finished slab. H. Make bends and offsets so the inside diameter is not effectively reduced. Unless otherwise indicated, keep the legs of a bend in the same plane and the straight legs of offsets parallel. I. Use raceway fittings that are of types compatible with the associated raceway and suitable for the use and location. For intermediate steel conduit, use threaded rigid steel conduit fittings except as otherwise indicated. J. Run concealed raceways with a minimum of bends in the shortest practical distance considering the type of building construction and obstructions except as otherwise indicated. This does not apply to conduits in crawl spaces. K. Install exposed raceways parallel and perpendicular to nearby surfaces or structural members and follow the surface contours as much as practical. L. Run exposed, parallel, or banked raceways together. Make bends in parallel or banked runs from the same center line so that the bends are parallel. Factory elbows may be used in banked runs only where they can be installed parallel. This requires that there be a change in the plane of the run such as from wall to ceiling and that the raceways be of the same size. In other cases provide field bends for parallel raceways. M. Join raceways with fittings designed and approved for the purpose and make joints tight. Where joints cannot be made tight, use bonding jumpers to provide electrical continuity of the raceway system. Make raceway terminations tight. Where terminations are subject to vibration, use bonding bushings or wedges to assure electrical continuity. Where subject to vibration or dampness, use insulating bushings to protect conductors. N. Tighten set screws of threadless fittings with suitable tool. O. Terminations: Where raceways are terminated with locknuts and bushings, align the raceway to enter squarely and install the locknuts with dished part against the box. Use two locknuts, one inside and one outside the box. P. Where terminating in threaded hubs, screw the raceway or fitting tight into the hub so the end bears against the wire protection shoulder. Where chase nipples are used, align the raceway so the coupling is square to the box, and tighten the chase nipple so no threads are exposed. Q. Install pull wires in empty raceways. Use no. 14 AWG zinc-coated steel or monofilament plastic line having not less than 200-lb. tensile strength. Leave not less than 18 inches of slack at each end of the pull wire. R. Telephone and signal system raceways 2-inch trade size and smaller: In addition to the above requirements, install raceways 2-inch and smaller trade size in maximum lengths at 150 feet and with a maximum of two, 90-deg. bonds or equivalent. Install pull or junction boxes where necessary to comply with these requirements. S. Install raceway sealing fittings in accordance with the manufacturer's written instructions. Project No. YSU

5 Locate fittings at suitable, approved, accessible locations and fill them with UL-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 and elsewhere as indicated. T. Stub-up connections: Extend conduits through concrete floor for connection to free standing equipment with an adjustable top or coupling threaded inside for plugs and set flush with the finished floor. Extend conductors to equipment with rigid steel conduit; flexible metal conduit may be used 6 inches above the floor. Where equipment connections are not made under this contract, install screwdriver-operated threaded flush plugs flush with floor. U. Flexible connections: Use short length (maximum of 6 ft.) of flexible conduit for recessed and semirecessed lighting fixtures, for equipment subject to vibration, noise transmission, or movement; and for all motors. Use Liquidtight flexible conduit in wet locations. Install separate ground conductor across flexible connections. V. Provide fire seal at all wall penetrations. W. Wiring in patient care areas shall be in strict accordance with the NEC ADJUSTING AND CLEANING A. Upon completion of installation of raceways, inspect interiors of raceways; clear all blockages and remove burrs, dirt, and construction debris. END OF SECTION Project No. YSU