SECTION LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES
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1 SECTION LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES PART 1- GENERAL 1.1 SUMMARY Section Includes: 1. Building wires and cables rated 600 V and less. 2. Connectors, splices, and terminations rated 600 V and less. B. Related Requirements: 1. Section "Control-Voltage Electrical Power Cables" for control systems communications cables and Classes 1, 2 and 3 control cables. 2. Section "Communications Horizontal Cabling" for cabling used for voice and data circuits. 1.2 ACTION SUBMITTALS Product Data: For each type of product. 1.3 INFORMATIONAL SUBMITTALS Field quality-control reports. PART 2- PRODUCTS 2.1 CONDUCTORS AND CABLES Aluminum and Copper Conductors: Comply with NEMA WC 70/ICEA S B. Conductor Insulation: Comply with NEMA WC 70/ICEA S for Type THHN/THWN-2, Type XHHW-2 and Type SO. C. Multiconductor Cable: Comply with NEMA WC 70/ICEA S for metal-clad cable, Type MC, and Type SO with ground wire. D. VFC Cable: 1. Comply with UL 1277, UL 1685, and NFPA 70 for Type TC-ER cable. 2. Type TC-ER with oversized crosslinked polyethylene insulation, spiral-wrapped foil plus 85 percent coverage braided shields and insulated full-size ground wire, and sunlight- and oil-resistant outer PVC jacket. 3. Comply with UL requirements for cables in Classes I and II, Division 2 hazardous location applications. Columbia Public Schools PWA /1 LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES
2 E. Plenum Rated Cable: Comply with UL 910 for optical density and flame spread index. 2.2 CONNECTORS AND SPLICES Description: Factory-fabricated connectors and splices of size, ampacity rating, material, type, and class for application and service indicated. 2.3 SYSTEM DESCRIPTION Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFP A 70, by a qualified testing agency, and marked for intended location and application. B. Comply with NFPA 70. PART 3- EXECUTION 3.1 CONDUCTOR MATERIAL APPLICATIONS Feeders: Copper for feeders smaller than No.4 A WG; copper or aluminum for feeders No.4 AWG and larger. Solid for No. 10 AWG and smaller; stranded for No.8 AWG and larger. B. Branch Circuits: Copper. Solid for No. 10 A WG and smaller; stranded for No. 8 AWG and larger, except VFC cable, which shall be extra flexible stranded. 3.2 CONDUCTOR INSULATION AND MULTICONDUCTOR CABLE APPLICATIONS AND WIRING METHODS Service Entrance: Type XHHW-2, single conductors in raceway. B. Exposed Feeders: Type XHHW-2, single conductors in raceway. C. Feeders Concealed in Ceilings, Walls, Partitions, and Crawlspaces: Type THHN/THWN-2, single conductors in raceway. D. Feeders Concealed in Concrete, below Slabs-on-Grade, and Underground: Type XHHW-2, single conductors in raceway. E. Feeders Installed below Raised Flooring: Type THHN/THWN-2, single conductors in raceway. F. Exposed Branch Circuits, Including in Crawlspaces: Type THHN/THWN-2, single conductors in raceway. G. Branch Circuits Concealed in Ceilings, Walls, and Patiitions: Type THHN/THWN-2, single conductors in raceway. H. Branch Circuits Concealed in Concrete, below Slabs-on-Grade, and Underground: Type XHHW-2, single conductors in raceway. Columbia Public Schools PWA /2 LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES
3 I. Branch Circuits Installed below Raised Flooring: Type THHN/THWN-2, single conductors in raceway. J. K. Cord Drops and Portable Appliance Connections: Type SO, hard service cord with stainlesssteel, wire-mesh, strain relief device at terminations to suit application. VFC Output Circuits: Type TC-ER cable with braided shield. 3.3 B. C. D. E. F. INSTALLATION OF CONDUCTORS AND CABLES Conceal cables in finished walls, ceilings, and floors unless otherwise indicated. Complete raceway installation between conductor and cable termination points according to Section "Raceways and Boxes for Electrical Systems" prior to pulling conductors and cables. Use manufacturer-approved pulling compound or lubricant where necessary; compound used must not deteriorate conductor or insulation. Do not exceed manufacturer's recommended maximum pulling tensions and sidewall pressure values. Use pulling means, including fish tape, cable, rope, and basket-weave wire/cable grips, that will not damage cables or raceway. Install exposed cables parallel and perpendicular to surfaces of exposed structural members, and follow surface contours where possible. Support cables according to Section "Hangers and Supports for Electrical Systems." 3.4 B. CONNECTIONS Tighten electrical connectors and terminals according to manufacturer's published torquetightening values. If manufacturer's torque values are not indicated, use those specified in UL 486A-486B. Make splices, terminations, and taps that are compatible with conductor material and that possess equivalent or better mechanical strength and insulation ratings than unspliced conductors. 1. Use oxide inhibitor in each splice, termination, and tap for aluminum conductors. c. Wiring at Outlets: Install conductor at each outlet, with at least 6 inches of slack. 3.5 IDENTIFICATION Identify and color-code conductors and cables according to Section "Identification for Electrical Systems." B. Identify each spare conductor at each end with identity number and location of other end of conductor, and identify as spare conductor. Columbia Public Schools PWA /3 LOW-VOLT AGE ELECTRICAL POWER CONDUCTORS AND CABLES
4 3.6 SLEEVE AND SLEEVE-SEAL INSTALLATION FOR ELECTRICAL PENETRATIONS Install sleeves and sleeve seals at penetrations of exterior floor and wall assemblies. Comply with requirements in Section "Sleeves and Sleeve Seals for Electrical Raceways and Cabling." 3.7 FIRESTOPPING Apply firestopping to electrical penetrations of fire-rated floor and wall assemblies to restore original fire-resistance rating of assembly according to Section "Penetration Firestopping." 3.8 FIELD QUALITY CONTROL Perform the following tests and inspections: 1. After installing conductors and cables and before electrical circuitry has been energized, test service entrance and feeder conductors for compliance with requirements. 2. Perform each visual and mechanical inspection and electrical test stated in NET A Acceptance Testing Specification. Certify compliance with test parameters. B. Test and Inspection Reports: Prepare a written report to record the following: 1. Procedures used. 2. Results that comply with requirements. 3. Results that do not comply with requirements and corrective action taken to achieve compliance with requirements. C. Cables will be considered defective if they do not pass tests and inspections. END OF SECTION Columbia Public Schools PWA /4 LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES
5 SECTION GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS PART 1- GENERAL 1.1 SUMMARY Section includes grounding and bonding systems and equipment. 1.2 ACTION SUBMITTALS Product Data: For each type of product indicated. PART 2- PRODUCTS 2.1 SYSTEM DESCRIPTION Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFP A 70, by a qualified testing agency, and marked for intended location and application. B. Comply with UL 467 for grounding and bonding materials and equipment. 2.2 CONDUCTORS Insulated Conductors: Copper or tinned-copper wire or cable insulated for 600 V unless otherwise required by applicable Code or authorities having jurisdiction. B. Bare Copper Conductors: 1. Solid Conductors: ASTM B Stranded Conductors: ASTM B Tinned Conductors: ASTM B Bonding Cable: 28 kcmil, 14 strands ofno. 17 AWG conductor, 1/4 inch in diameter. 5. Bonding Conductor: No.4 or No.6 AWG, stranded conductor. 6. Bonding Jumper: Copper tape, braided conductors terminated with copper ferrules; 1-5/8 inches wide and 1/16 inch thick. 7. Tinned Bonding Jumper: Tinned-copper tape, braided conductors terminated with copper ferrules; 1-5/8 inches wide and 1116 inch thick. 2.3 CONNECTORS Listed and labeled by an NRTL acceptable to authorities having jurisdiction for applications in which used and for specific types, sizes, and combinations of conductors and other items connected. Columbia Public Schools PWA /1 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
6 B. Bolted Connectors for Conductors and Pipes: Copper or copper alloy. C. Welded Connectors: Exothermic-welding kits of types recommended by kit manufacturer for materials beingjoined and installation conditions. D. Bus-Bar Connectors: Mechanical type, cast silicon bronze, solderless compression-type wire terminals, and long-barrel, two-bolt connection to ground bus bar. 2.4 GROUNDING ELECTRODES Ground Rods: Copper-clad steel; 5/8 by 96 inches. PART 3- EXECUTION 3.1 APPLICATIONS Conductors: Install solid conductor for No. 8 A WG and smaller, and stranded conductors for No. 6 A WG and larger unless otherwise indicated. B. Underground Grounding Conductors: Install bare tinned-copper conductor, No. 2/0 AWG minimum. 1. Bury at least 24 inches below grade. C. Conductor Terminations and Connections: 1. Pipe and Equipment Grounding Conductor Terminations: Bolted connectors. 2. Underground Connections: Welded connectors except at test wells and as otherwise indicated. 3. Connections to Ground Rods at Test Wells: Bolted connectors. 4. Connections to Structural Steel: Welded connectors. 3.2 GROUNDING AT THE SERVICE Equipment grounding conductors and grounding electrode conductors shall be connected to the ground bus. Install a main bonding jumper between the neutral and ground buses. 3.3 EQUIPMENT GROUNDING Install insulated equipment grounding conductors with the following items, in addition to those required by NFPA 70: 1. Feeders and branch circuits. 2. Lighting circuits. 3. Receptacle circuits. 4. Single-phase motor and appliance branch circuits. 5. Three-phase motor and appliance branch circuits. Columbia Public Schools PWA /2 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
7 6. Flexible raceway runs. 7. Armored and metal-clad cable runs. 8. Busway Supply Circuits: Install insulated equipment grounding conductor from grounding bus in the switchgear, switchboard, or distribution panel to equipment grounding bar terminal on busway. B. c. D. Air-Duct Equipment Circuits: Install insulated equipment grounding conductor to duct-mounted electrical devices operating at 120 V and more, including air cleaners, heaters, dampers, humidifiers, and other duct electrical equipment. Bond conductor to each unit and to air duct and connected metallic piping. Water Heater, Heat-Tracing, and Anti frost Heating Cables: Install a separate insulated equipment grounding conductor to each electric water heater and heat-tracing cable. Bond conductor to heater units, piping, connected equipment, and components. Poles Supporting Outdoor Lighting Fixtures: Install grounding electrode and a separate insulated equipment grounding conductor in addition to grounding conductor installed with branch-circuit conductors. 3.4 B. c. INSTALLATION Grounding Conductors: Route along shortest and straightest paths possible unless otherwise indicated or required by Code. A void obstructing access or placing conductors where they may be subjected to strain, impact, or damage. Ground Bonding Common with Lightning Protection System: Comply with NFP A 780 and UL 96 when interconnecting with lightning protection system. Bond electrical power system ground directly to lightning protection system grounding conductor at closest point to electrical service grounding electrode. Use bonding conductor sized same as system grounding electrode conductor, and install in conduit. Ground Rods: Drive rods until tops are 2 inches below finished floor or final grade unless otherwise indicated. 1. Interconnect ground rods with grounding electrode conductor below grade and as otherwise indicated. Make connections without exposing steel or damaging coating if any. 2. For grounding electrode system, install at least three rods spaced at least one-rod length and at most two-rod lengths from each other and located at least the same distance from other grounding electrodes, and connect to the service grounding electrode conductor. D. Bonding Straps and Jumpers: Install in locations accessible for inspection and maintenance except where routed through short lengths of conduit. 1. Bonding to Structure: Bond straps directly to basic structure, taking care not to penetrate any adjacent parts. 2. Bonding to Equipment Mounted on Vibration Isolation Hangers and Supports: Install bonding so vibration is not transmitted to rigidly mounted equipment. 3. Use exothermic-welded connectors for outdoor locations; if a disconnect-type connection is required, use a bolted clamp. Columbia Public Schools PWA /3 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
8 E. Grounding and Bonding for Piping: 1. Metal Water Service Pipe: Install insulated copper grounding conductors, in conduit, from building's main service equipment, or grounding bus, to main metal water service entrances to building. Connect grounding conductors to main metal water service pipes; use a bolted clamp connector or bolt a lug-type connector to a pipe flange by using one of the lug bolts of the flange. Where a dielectric main water fitting is installed, connect grounding conductor on street side of fitting. Bond metal grounding conductor conduit or sleeve to conductor at each end. 2. Water Meter Piping: Use braided-type bonding jumpers to electrically bypass water meters. Connect to pipe with a bolted connector. 3. Bond each aboveground portion of gas piping system downstream from equipment shutoff valve. 3.5 B. FIELD QUALITY CONTROL Perform tests and inspections. Inspect physical and mechanical condition. Verity tightness of accessible, bolted, electrical connections with a calibrated torque wrench according to manufacturer's written instructions. Excessive Ground Resistance: If resistance to ground exceeds specified values, notify Architect promptly and include recommendations to reduce ground resistance END OF SECTION Columbia Public Schools PWA /4 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
9 SECTION HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS PART 1- GENERAL 1.1 SUMMARY Section includes: 1. Hangers and supports for electrical equipment and systems. 2. Construction requirements for concrete bases. 1.2 PERFORMANCE REQUIREMENTS Design supports for multiple raceways capable of supporting combined weight of supported systems and its contents. B. Design equipment suppmts capable of suppmting combined operating weight of supported equipment and connected systems and components. C. Rated Strength: Adequate in tension, shear, and pullout force to resist maximum loads calculated or imposed for this Project, with a minimum structural safety factor of five times the applied force. 1.3 ACTION SUBMITTALS Product Data: For steel slotted support systems. 1.4 INFORMATIONAL SUBMITTALS Welding certificates. 1.5 QUALITY ASSURANCE Welding: Qualify procedures and personnel according to AWS D1.1/D1.1M, "Structural Welding Code- Steel." B. Comply with NFPA 70. Columbia Public Schools PWA /1 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS
10 PART 2- PRODUCTS 2.1 SUPPORT, ANCHORAGE, AND ATTACHMENT COMPONENTS Steel Slotted Support Systems: Comply with MFMA-4, factory-fabricated components for field assembly. 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Cooper B-Line, Inc.; a division of Cooper Industries. b. ERICO International Corporation. c. Thomas & Betts Corporation, A Member of the ABB Group. 2. Painted Coatings: Manufacturer's standard painted coating applied according to MFMA Channel Dimensions: Selected for applicable load criteria. B. Raceway and Cable Supports: As described in NECA 1 and NECA 101. C. Conduit and Cable Support Devices: Steel and malleable-iron hangers, clamps, and associated fittings, designed for types and sizes of raceway or cable to be supported. D. Support for Conductors in Vertical Conduit: Factory-fabricated assembly consisting of threaded body and insulating wedging plug or plugs for non-armored electrical conductors or cables in riser conduits. Plugs shall have number, size, and shape of conductor gripping pieces as required to suit individual conductors or cables suppotied. Body shall be malleable iron. E. Structural Steel for Fabricated Supports and Restraints: ASTM A 36/A 36M, steel plates, shapes, and bars; black and galvanized. F. Mounting, Anchoring, and Attachment Components: Items for fastening electrical items or their suppotis to building surfaces include the following: 1. Powder-Actuated Fasteners: Threaded-steel stud, for use in hardened portland cement concrete, steel, or wood, with tension, shear, and pullout capacities appropriate for supported loads and building materials where used. a. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1) Hilti, Inc. 2) ITW Ramset/Red Head; Illinois Tool Works, Inc. 3) Simpson Strong-Tie Co., Inc. 2. Mechanical-Expansion Anchors: Insert-wedge-type, zinc-coated steel, for use in hardened portland cement concrete with tension, shear, and pullout capacities appropriate for suppotied loads and building materials in which used. Columbia Public Schools PWA /2 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS
11 a. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1) Cooper B-Line, Inc.; a division of Cooper Industries. 2) Hilti, Inc. 3) ITW Ramset/Red Head; Illinois Tool Works, Inc. 3. Concrete Inserts: Steel or malleable-iron, slotted support system units similar to MSS Type 18; complying with MFMA-4 or MSS SP Clamps for Attachment to Steel Structural Elements: MSS SP-58, type suitable for attached structural element. 5. Through Bolts: Structural type, hex head, and high strength. Comply with ASTM A Toggle Bolts: All-steel springhead type. 7. Hanger Rods: Threaded steel. PART 3- EXECUTION 3.1 APPLICATION Comply with NECA 1 and NECA 101 for application of hangers and supports for electrical equipment and systems except if requirements in this Section are stricter. B. Maximum Support Spacing and Minimum Hanger Rod Size for Raceway: Space supports for EMT, IMC, and RMC as required by NFPA 70. Minimum rod size shall be 114 inch in diameter. C. Multiple Raceways or Cables: Install trapeze-type suppotis fabricated with steel slottedsupport system, sized so capacity can be increased by at least 25 percent in future without exceeding specified design load limits. 1. Secure raceways and cables to these suppotis with single-bolt conduit clamps. D. Spring-steel clamps designed for supporting single conduits without bolts may be used for 1-1/2-inch and smaller raceways serving branch circuits and communication systems above suspended ceilings and for fastening raceways to trapeze suppotis. 3.2 SUPPORT INSTALLATION Comply with NECA 1 and NECA 101 for installation requirements except as specified in this Article. B. Raceway Support Methods: In addition to methods described in NECA 1, EMT, IMC, and RMC may be supported by openings through structure members, as permitted in NFPA 70. c. Strength of Support Assemblies: Where not indicated, select sizes of components so strength will be adequate to carry present and future static loads within specified loading limits. Minimum static design load used for strength determination shall be weight of suppotied components plus 200 lb. Columbia Public Schools PWA /3 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS
12 D. Mounting and Anchorage of Surface-Mounted Equipment and Components: Anchor and fasten electrical items and their supports to building structural elements by the following methods unless otherwise indicated by code: 1. To Wood: Fasten with lag screws or through bolts. 2. To New Concrete: Bolt to concrete inserts. 3. To Masonry: Approved toggle-type bolts on hollow masonry units and expansion anchor fasteners on solid masonry units. 4. To Existing Concrete: Expansion anchor fasteners. 5. Instead of expansion anchors, powder-actuated driven threaded studs provided with lock washers and nuts may be used in existing standard-weight concrete 4 inches thick or greater. Do not use for anchorage to lightweight-aggregate concrete or for slabs less than 4 inches thick. 6. To Steel: Beam clamps (MSS Type 19, 21, 23, 25, or 27) complying with MSS SP To Light Steel: Sheet metal screws. 8. Items Mounted on Hollow Walls and Nonstructural Building Surfaces: Mount cabinets, panelboards, disconnect switches, control enclosures, pull and junction boxes, transformers, and other devices on slotted-channel racks attached to substrate. E. Drill holes for expansion anchors in concrete at locations and to depths that avoid reinforcing bars. 3.3 INSTALLATION OF FABRICATED METAL SUPPORTS Comply with installation requirements in Section "Metal Fabrications" for sitefabricated metal supports. B. Cut, fit, and place miscellaneous metal supports accurately in location, alignment, and elevation to suppmi and anchor electrical materials and equipment. C. Field Welding: Comply with AWS 01.1/Dl.IM. 3.4 CONCRETE BASES Construct concrete bases of dimensions indicated but not less than 4 inches larger in both directions than supported unit, and so anchors will be a minimum of 1 0 bolt diameters from edge of the base. B. Use 3000-psi, 28-day compressive-strength concrete. Concrete materials, reinforcement, and placement requirements are specified in Section "Miscellaneous Cast-in-Place Concrete." C. Anchor equipment to concrete base. 1. Place and secure anchorage devices. Use suppotied equipment manufacturer's setting drawings, templates, diagrams, instructions, and directions furnished with items to be embedded. 2. Install anchor bolts to elevations required for proper attachment to supported equipment. 3. Install anchor bolts according to anchor-bolt manufacturer's written instructions. Columbia Public Schools PWA /4 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS
13 3.5 PAINTING Touchup: Clean field welds and abraded areas of shop paint. Paint exposed areas immediately after erecting hangers and supports. Use same materials as used for shop painting. Comply with SSPC-PA I requirements for touching up field-painted surfaces. 1. Apply paint by brush or spray to provide minimum dry film thickness of2.0 mils. B. Galvanized Surfaces: Clean welds, bolted connections, and abraded areas and apply galvanizing-repair paint to comply with ASTM A 780. END OF SECTION Columbia Public Schools PWA /5 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS
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15 SECTION RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS PART 1- GENERAL 1.1 SUMMARY Section Includes: 1. Metal conduits, tubing, and fittings. 2. Nonmetal conduits, tubing, and fittings. 3. Metal wireways and auxiliary gutters. 4. Boxes, enclosures, and cabinets. 5. Handholes and boxes for exterior underground cabling. B. Related Requirements: 1. Section "Pathways for Communications Systems" for conduits, wireways, surface pathways, innerduct, boxes, faceplate adapters, enclosures, cabinets, and handholes serving communications systems. 2. Section "Pathways for Electronic Safety and Security" for conduits, surface pathways, innerduct, boxes, and faceplate adapters serving electronic safety and security. 1.2 ACTION SUBMITTALS Product Data: For surface raceways, wireways and fittings, floor boxes, hinged-cover enclosures, and cabinets. PART 2- PRODUCTS 2.1 METAL CONDUITS, TUBING, AND FITTINGS B. c. D. E. F. G. Listing and Labeling: Metal conduits, tubing, and fittings shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. GRC: Comply with ANSI C80.1 and UL 6. IMC: Comply with ANSI C80.6 and UL EMT: Comply with ANSI C80.3 and UL 797. FMC: Comply with UL 1; zinc-coated steel. LFMC: Flexible steel conduit with PVC jacket and complying with UL 360. Fittings for Metal Conduit: Comply with NEMA FB 1 and UL 514B. Columbia Public Schools PWA /1 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
16 1. Conduit Fittings for Hazardous (Classified) Locations: Comply with UL 886 and NFPA Fittings for EMT: a. Material: Die cast. b. Type: Setscrew. 3. Expansion Fittings: PVC or steel to match conduit type, complying with UL 651, rated for environmental conditions where installed, and including flexible external bonding jumper. H. Joint Compound for IMC, GRC, or ARC: Approved, as defined in NFPA 70, by authorities having jurisdiction for use in conduit assemblies, and compounded for use to lubricate and protect threaded conduit joints from corrosion and to enhance their conductivity. 2.2 NONMETALLIC CONDUITS, TUBING, AND FITTINGS Listing and Labeling: Nonmetallic conduits, tubing, and fittings shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. B. RNC: Type EPC-40-PVC, complying with NEMA TC 2 and UL 651 unless otherwise indicated. C. Fittings for RNC: Comply with NEMA TC 3; match to conduit or tubing type and material. 2.3 METAL WIREW A YS AND AUXILIARY GUTTERS Description: Sheet metal, complying with UL 870 and NEMA 250, Type 1 unless otherwise indicated, and sized according to NFPA Metal wireways installed outdoors shall be listed and labeled as defined in NFP A 70, by a qualified testing agency, and marked for intended location and application. B. Fittings and Accessories: Include covers, couplings, offsets, elbows, expansion joints, adapters, hold-down straps, end caps, and other fittings to match and mate with wireways as required for complete system. 2.4 BOXES, ENCLOSURES, AND CABINETS General Requirements for Boxes, Enclosures, and Cabinets: Boxes, enclosures, and cabinets installed in wet locations shall be listed for use in wet locations. B. Sheet Metal Outlet and Device Boxes: Comply with NEMA OS 1 and UL 514 C. Cast-Metal Outlet and Device Boxes: Comply with NEMA FB 1, ferrous alloy, Type FD, with gasketed cover. D. Nonmetallic Outlet and Device Boxes: Comply with NEMA OS 2 and UL 514C. Columbia Public Schools PWA /2 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
17 E. Metal Floor Boxes: 1. Material: Cast metal or sheet metal. 2. Type: Fully adjustable. 3. Shape: Rectangular. 4. Listing and Labeling: Metal floor boxes shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. F. Nonmetallic Floor Boxes: Nonadjustable, round. 1. Listing and Labeling: Nonmetallic floor boxes shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. G. Small Sheet Metal Pull and Junction Boxes: NEMA OS 1. H. Cast-Metal Access, Pull, and Junction Boxes: Comply with NEMA FB 1 and UL 1773, galvanized, cast iron with gasketed cover. I. Box extensions used to accommodate new building finishes shall be of same material as recessed box. J. Device Box Dimensions: 4 inches by 2-1/8 inches by 2-1/8 inches deep. K. Gangable boxes are allowed. L. Hinged-Cover Enclosures: Comply with UL 50 and 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. 2. Nonmetallic Enclosures: Plastic. 3. Interior Panels: Steel; all sides finished with manufacturer's standard enamel. M. 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. 6. Nonmetallic cabinets shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. 2.5 HAND HOLES AND BOXES FOR EXTERIOR UNDERGROUND WIRING General Requirements for Handholes and Boxes: 1. Boxes and handholes for use in underground systems shall be designed and identified as defined in NFP A 70, for intended location and application. Columbia Public Schools PWA /3 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
18 2. Boxes installed in wet areas shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. B. Polymer-Concrete Handholes and Boxes with Polymer-Concrete Cover: Molded of sand and aggregate, bound together with polymer resin, and reinforced with steel, fiberglass, or a combination of the two. 1. Standard: Comply with SCTE Configuration: Designed for flush burial with open bottom unless otherwise indicated. 3. Cover: Weatherproof, secured by tamper-resistant locking devices and having structural load rating consistent with enclosure and handhole location. 4. Cover Finish: Nonskid finish shall have a minimum coefficient offriction of Cover Legend: Molded lettering, "ELECTRIC.". 6. Conduit Entrance Provisions: Conduit-terminating fittings shall mate with entering ducts for secure, fixed installation in enclosure wall. PART 3- EXECUTION 3.1 RACEWAY APPLICATION Outdoors: Apply raceway products as specified below unless otherwise indicated: 1. Exposed Conduit: GRC. 2. Concealed Conduit, Aboveground: IMC. 3. Underground Conduit: RNC, Type EPC-40-PVC, direct buried. 4. Connection to Vibrating Equipment (Including Transformers and Hydraulic, Pneumatic, Electric Solenoid, or Motor-Driven Equipment): LFMC. 5. Boxes and Enclosures, Aboveground: NEMA 250, Type 3R. B. Indoors: Apply raceway products as specified below unless otherwise indicated. 1. Exposed, Not Subject to Physical Damage: EMT. 2. Exposed, Not Subject to Severe Physical Damage: EMT. 3. Exposed and Subject to Severe Physical Damage: GRC. Raceway locations include the following: a. Loading dock. b. Corridors used for traffic of mechanized carts, forklifts, and pallet-handling units. c. Mechanical rooms. d. Gymnasiums. 4. Concealed in Ceilings and Interior Walls and Partitions: EMT. 5. Connection to Vibrating Equipment (Including Transformers and Hydraulic, Pneumatic, Electric Solenoid, or Motor-Driven Equipment): FMC, except use LFMC in damp or wet locations. 6. Damp or Wet Locations: IMC. 7. Boxes and Enclosures: NEMA 250, Type I, except use NEMA 250, Type 4 nonmetallic in institutional and commercial kitchens and damp or wet locations. Columbia Public Schools PWA /4 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
19 C. Minimum Raceway Size: 3/4-inch 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. Comply with NEMA FB EMT: Use setscrew, cast-metal fittings. Comply with NEMA FB Flexible Conduit: Use only fittings listed for use with flexible conduit. Comply with NEMA FB E. F. Do not install aluminum conduits, boxes, or fittings in contact with concrete or earth. Do not install nonmetallic conduit where ambient temperature exceeds 120 deg F. 3.2 INSTALLATION B. c. D. E. F. G. Comply with NECA 1 and NECA 101 for installation requirements except where requirements on Drawings or in this article are stricter. Comply with NECA 102 for aluminum conduits. Comply with NFP A 70 limitations for types of raceways allowed in specific occupancies and number of floors. Keep raceways at least 6 inches away from parallel runs of flues and steam or hot-water pipes. Install horizontal raceway runs above water and steam piping. Comply with requirements in Section "Hangers and Supports for Electrical Systems" for hangers and supports. Arrange stub-ups so curved potiions of bends are not visible above finished slab. Conceal conduit and EMT within finished walls, ceilings, and floors unless othetwise indicated. Install conduits parallel or perpendicular to building lines. Support conduit within 12 inchesof enclosures to which attached. Raceways Embedded in Slabs: 1. Run conduit larger than l-inch trade size, parallel or at right angles to main reinforcement. Where at right angles to reinforcement, place conduit close to slab support. Secure raceways to reinforcement at maximum 1 0-foot intervals. 2. Arrange raceways to cross building expansion joints at right angles with expansion fittings. 3. Arrange raceways to keep a minimum of 1 inch of concrete cover in all directions. 4. Do not embed threadless fittings in concrete unless specifically approved by Architect for each specific location. H. Stub-ups to Above Recessed Ceilings: 1. Use EMT, IMC, or RMC for raceways. 2. Use a conduit bushing or insulated fitting to terminate stub-ups not terminated in hubs or in an enclosure. Columbia Public Schools PWA /5 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
20 I. 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. J. Install pull wires in empty raceways. Use polypropylene or monofilament plastic line with not less than 200-lb tensile strength. Leave at least 12 inches of slack at each end of pull wire. Cap underground raceways designated as spare above grade alongside raceways in use. K. Install raceway sealing fittings at accessible locations according to NFP A 70 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. L. Install devices to seal raceway interiors at accessible locations. Locate seals so no fittings or boxes are between the seal and the following changes of environments. Seal the interior of all raceways at the following points: I. Where conduits pass from warm to cold locations, such as boundaries of refrigerated spaces. 2. Where an underground service raceway enters a building or structure. 3. Where otherwise required by NFPA 70. M. Flexible Conduit Connections: Comply with NEMA RV 3. Use a maximum of 72 inches of flexible conduit for recessed and semirecessed luminaires, equipment subject to vibration, noise transmission, or movement; and for transformers and motors. 1. Use LFMC in damp or wet locations subject to severe physical damage. 2. Use LFMC in damp or wet locations not subject to severe physical damage. N. Mount boxes at heights indicated on Drawings. If mounting heights of boxes are not individually indicated, give priority to ADA requirements. Install boxes with height measured to bottom of box unless otherwise indicated. 0. 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. Prepare block surfaces to provide a flat surface for a raintight connection between the box and cover plate or the supported equipment and box. P. Horizontally separate boxes mounted on opposite sides of walls so they are not in the same vertical channel. Q. Locate boxes so that cover or plate will not span different building finishes. R. Support boxes of three gangs or more from more than one side by spanning two framing members or mounting on brackets specifically designed for the purpose. S. Fasten junction and pull boxes to or suppoti from building structure. Do not suppoti boxes by conduits. T. Set metal floor boxes level and flush with finished floor surface. U. Set nonmetallic floor boxes level. Trim after installation to fit flush with finished floor surface. Columbia Public Schools PWA /6 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
21 3.3 INSTALLATION OF UNDERGROUND CONDUIT Direct-Buried Conduit: 1. Excavate trench bottom to provide firm and uniform suppott for conduit. Prepare trench bottom as specified in Section "Earth Moving" for pipe less than 6 inches in nominal diameter. 2. Install backfill as specified in Section "Eatth 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 inches of finished grade, make final conduit connection at end of run and complete backfilling with normal compaction as specified in Section "Earth Moving." 4. Install manufactured rigid steel conduit elbows for stub-ups at poles and equipment and at building entrances through floor. a. Couple steel conduits to ducts with adapters designed for this purpose, and encase coupling with 3 inches of concrete for a minimum of 12 inches on each side of the coupling. b. For stub-ups at equipment mounted on outdoor concrete bases and where conduits penetrate building foundations, extend steel conduit horizontally a minimum of 60 inches from edge of foundation or equipment base. Install insulated grounding bushings on terminations at equipment. 5. Underground Warning Tape: Comply with requirements m Section "Identification for Electrical Systems." 3.4 INSTALLATION OF UNDERGROUND HAND HOLES AND BOXES B. c. D. E. Install handholes and boxes level and plumb and with orientation and depth coordinated with connecting conduits to minimize bends and deflections required for proper entrances. Unless otherwise indicated, support units on a level bed of crushed stone or gravel, graded from 1/2-inch sieve to No.4 sieve and compacted to same density as adjacent undisturbed earth. Elevation: In paved areas, set so cover surface will be flush with finished grade. Set covers of other enclosures 1 inch above finished grade. Install handholes with bottom below frost line. Field-cut openings for conduits according to enclosure manufacturer's written instructions. Cut wall of enclosure with a tool designed for material to be cut. Size holes for terminating fittings to be used, and seal around penetrations after fittings are installed. Columbia Public Schools PWA /7 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
22 3.5 SLEEVE AND SLEEVE-SEAL INSTALLATION FOR ELECTRICAL PENETRATIONS Install sleeves and sleeve seals at penetrations of exterior floor and wall assemblies. Comply with requirements in Section "Sleeves and Sleeve Seals for Electrical Raceways and Cabling." 3.6 FIRESTOPPING Install firestopping at penetrations of fire-rated floor and wall assemblies. Comply with requirements in Section "Penetration Firestopping." 3. 7 PROTECTION Protect coatings, finishes, and cabinets from damage and deterioration. 1. Repair damage to galvanized finishes with zinc-rich paint recommended by manufacturer. 2. Repair damage to PVC coatings or paint finishes with matching touchup coating recommended by manufacturer. END OF SECTION Columbia Public Schools PWA /8 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS
23 SECTION IDENTIFICATION FOR ELECTRICAL SYSTEMS PART 1- GENERAL 1.1 SUMMARY Section Includes: 1. Identification for conductors. 2. Underground-line warning tape. 3. Warning labels and signs. 4. Instruction signs. 5. Equipment identification labels. 6. Miscellaneous identification products. 1.2 ACTION SUBMITTALS Product Data: For each electrical identification product indicated. 1.3 QUALITY ASSURANCE B. c. D. E. Comply with ANSI A13.1. Comply with NFPA 70. Comply with 29 CPR and 29 CPR Comply with ANSI Z535.4 for safety signs and labels. Adhesive-attached labeling materials, including label stocks, laminating adhesives, and inks used by label printers, shall comply with UL 969. PART 2- PRODUCTS 2.1 POWER AND CONTROL CABLE IDENTIFICATION MATERIALS Comply with ANSI A 13.1 for minimum size of letters for legend and for minimum length of color field for each raceway and cable size. B. Self-Adhesive Vinyl Labels: Preprinted, flexible label laminated with a clear, weather- and chemical-resistant coating and matching wraparound adhesive tape for securing ends of legend label. Columbia Public Schools PWA /1 IDENTIFICATION FOR ELECTRICAL SYSTEMS
24 2.2 CONDUCTOR IDENTIFICATION MATERIALS Color-Coding Conductor Tape: Colored, self-adhesive vinyl tape not less than 3 mils thick by 1 to 2 inches wide. B. Marker Tapes: Vinyl or vinyl-cloth, self-adhesive wraparound type, with circuit identification legend machine printed by thermal transfer or equivalent process. 2.3 FLOOR MARKING TAPE 2-inch- wide, 5-mil pressure-sensitive vinyl tape, with black and white stripes and clear vinyl overlay. 2.4 UNDERGROUND-LINE WARNING TAPE Tape: 1. Recommended by manufacturer for the method of installation and suitable to identify and locate underground electrical and communications utility lines. 2. Printing on tape shall be permanent and shall not be damaged by burial operations. 3. Tape material and ink shall be chemically ineti, and not subject to degrading when exposed to acids, alkalis, and other destructive substances commonly found in soils. B. Color and Printing: 1. Comply with ANSI Z535.1 through ANSI Z Inscriptions for Red-Colored Tapes: ELECTRIC LINE, HIGH VOLTAGE,. 3. Inscriptions for Orange-Colored Tapes: TELEPHONE CABLE, CATV CABLE, COMMUNICATIONS CABLE, OPTICAL FIBER CABLE,. C. Tag: Type ID: 1. Detectable three-layer laminate, consisting of a printed pigmented polyolefin film, a solid aluminum-foil core, and a clear protective film that allows inspection of the continuity of the conductive core, bright-colored, continuous-printed on one side with the inscription of the utility, compounded for direct-burial service. 2. Overall Thickness: 5 mils. 3. Foil Core Thickness: mil. 4. Weight: 28lb/1000 sq. ft Inch Tensile According to ASTM D 882: 70 lbf, and 4600 psi. 2.5 WARNING LABELS AND SIGNS Comply with NFPA 70 and 29 CFR B. Self-Adhesive Warning Labels: Factory-printed, multicolor, pressure-sensitive adhesive labels, configured for display on front cover, door, or other access to equipment unless otherwise indicated. Columbia Public Schools PWA /2 IDENTIFICATION FOR ELECTRICAL SYSTEMS
25 C. Baked-Enamel Warning Signs: 1. Preprinted aluminum signs, punched or drilled for fasteners, with colors, legend, and size required for application. 2. 1/4-inch grommets in corners for mounting. 3. Nominal size, 7 by 10 inches. D. Warning label and sign shall include, but are not limited to, the following legends: 1. Multiple Power Source Warning: "DANGER - ELECTRICAL SHOCK HAZARD - EQUIPMENT HAS MULTIPLE POWER SOURCES." 2. Workspace Clearance Warning: "WARNING - OSHA REGULATION - AREA IN FRONT OF ELECTRICAL EQUIPMENT MUST BE KEPT CLEAR FOR 36 INCHES." 2.6 INSTRUCTION SIGNS Engraved, laminated acrylic or melamine plastic, minimum l/16 inch thick for signs up to 20 sq. inches and 1/8 inch thick for larger sizes. 1. Engraved legend with black letters on white face. 2. Punched or drilled for mechanical fasteners. 3. Framed with mitered acrylic molding and arranged for attachment at applicable equipment. 2.7 EQUIPMENT IDENTIFICATION LABELS Self-Adhesive, Engraved, Laminated Acrylic or Melamine Label: Adhesive backed, with white letters on a dark-gray background. Minimum letter height shall be 3/8 inch. B. Stenciled Legend: In nonfading, waterproof, black ink or paint. Minimum letter height shall be 1 inch. 2.8 MISCELLANEOUS IDENTIFICATION PRODUCTS Paint: Comply with requirements in painting Sections for paint materials and application requirements. Select paint system applicable for surface material and location (exterior or interior). B. Fasteners for Labels and Signs: Self-tapping, stainless-steel screws or stainless-steel machine screws with nuts and flat and lock washers. PART 3- EXECUTION 3.1 INSTALLATION Location: Install identification materials and devices at locations for most convenient viewing without interference with operation and maintenance of equipment. Columbia Public Schools PWA /3 IDENTIFICATION FOR ELECTRICAL SYSTEMS
26 B. Apply identification devices to surfaces that require finish after completing finish work. C. Self-Adhesive Identification Products: Clean surfaces before application, using materials and methods recommended by manufacturer of identification device. D. Attach signs and plastic labels that are not self-adhesive type with mechanical fasteners appropriate to the location and substrate. E. System Identification Color-Coding Bands for Raceways and Cables: Each color-coding band shall completely encircle cable or conduit. Place adjacent bands of two-color markings in contact, side by side. Locate bands at changes in direction, at penetrations of walls and floors, at 50-foot maximum intervals in straight runs, and at 25-foot maximum intervals in congested areas. F. G. Underground-Line Warning Tape: During backfilling of trenches install continuous underground-line warning tape directly above line at 6 to 8 inches below finished grade. Use multiple tapes where width of multiple lines installed in a common trench exceeds 16 inches overall. Painted Identification: Comply with requirements in painting Sections for surface preparation and paint application. 3.2 IDENTIFICATION SCHEDULE Power-Circuit Conductor Identification, 600 V or Less: For conductors in vaults, pull and junction boxes, manholes, and handholes, use color-coding conductor tape to identify the phase. 1. Color-Coding for Phase and Voltage Level Identification, 600 V or Less: Use colors listed below for ungrounded service, feeder, and branch-circuit conductors. a. Color shall be factory applied or field applied for sizes larger than No. 8 AWG, if authorities having jurisdiction permit. b. Colors for 208/120-V Circuits: 1) Phase A: Black. 2) Phase B: Red. 3) Phase C: Blue. c. Colors for 480/277-V Circuits: 1) Phase A: Brown. 2) Phase B: Orange. 3) Phase C: Yellow. d. Field-Applied, Color-Coding Conductor Tape: Apply in half-lapped turns for a minimum distance of 6 inches from terminal points and in boxes where splices or taps are made. Apply last two turns of tape with no tension to prevent possible unwinding. Locate bands to avoid obscuring factory cable markings. Columbia Public Schools PWA /4 IDENTIFICATION FOR ELECTRICAL SYSTEMS
27 B. Install instructional sign including the color-code for grounded and ungrounded conductors using adhesive-film-type labels. C. Conductors to Be Extended in the Future: Attach marker tape to conductors and list source. D. Auxiliary Electrical Systems Conductor Identification: Identify field-installed alarm, control, and signal connections. 1. Identify conductors, cables, and terminals in enclosures and at junctions, terminals, and pull points. Identify by system and circuit designation. 2. Use system of marker tape designations that is uniform and consistent with system used by manufacturer for factory-installed connections. 3. Coordinate identification with Project Drawings, manufacturer's wiring diagrams, and the Operation and Maintenance Manual. E. Locations of Underground Lines: Identify with underground-line warning tape for power, lighting, communication, and control wiring and optical fiber cable. 1. Limit use of underground-line warning tape to direct-buried cables. 2. Install underground-line warning tape for both direct-buried cables and cables m raceway. F. Workspace Indication: Install floor marking tape to show working clearances in the direction of access to live parts. Workspace shall be as required by NFPA 70 and 29 CFR unless otherwise indicated. Do not install at flush-mounted panelboards and similar equipment in finished spaces. G. Warning Labels for Indoor Cabinets, Boxes, and Enclosures for Power and Lighting: Bakedenamel warning signs. 1. Comply with 29 CFR Identify system voltage with black letters on an orange background. 3. Apply to exterior of door, cover, or other access. 4. For equipment with multiple power or control sources, apply to door or cover of equipment including, but not limited to, the following: a. Controls with external control power connections. H. Operating Instruction Signs: Install instruction signs to facilitate proper operation and maintenance of electrical systems and items to which they connect. Install instruction signs with approved legend where instructions are needed for system or equipment operation. I. Equipment Identification Labels: On each unit of equipment, install unique designation label that is consistent with wiring diagrams, schedules, and the Operation and Maintenance Manual. Apply labels to disconnect switches and protection equipment, central or master units, control panels, control stations, terminal cabinets, and racks of each system. Systems include power, lighting, control, communication, signal, monitoring, and alarm systems unless equipment is provided with its own identification. 1. Labeling Instructions: Columbia Public Schools PWA /5 IDENTIFICATION FOR ELECTRICAL SYSTEMS
28 a. Indoor Equipment: Self-adhesive, engraved, laminated acrylic or melamine label. Unless otherwise indicated, provide a single line of text with 1/2-inch- high letters on 1-1/2-inch- high label; where two lines of text are required, use labels 2 inches high. b. Outdoor Equipment: Engraved, laminated acrylic or melamine label. c. Elevated Components: Increase sizes of labels and letters to those appropriate for viewing from the floor. d. Unless provided with self-adhesive means of attachment, fasten labels with appropriate mechanical fasteners that do not change the NEMA or NRTL rating of the enclosure. END OF SECTION Columbia Public Schools PWA /6 IDENTIFICATION FOR ELECTRICAL SYSTEMS
A. Product Data: For each electrical identification product indicated. B. Comply with 29 CFR and 29 CFR
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