S02 - Attachment 18 - 260533 RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS.docx
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- Attached to
- Install Garage Cameras at Lake Nona VAMC
- Solicitation number
- 36C24823R0050
About this file
This document provides specifications for raceway and boxes for electrical systems to be installed as part of a federal construction project. Key requirements include the furnishing and installation of various types of conduits, fittings, boxes, and related equipment to form grounded raceway systems. Specified materials include electrical metallic tubing, rigid steel conduit, and PVC tubing. Supporting details cover installation methods for concealed and exposed work, penetrations, expansion joints, supports, and box installation. The document also references applicable publications and codes from organizations like NFPA, UL, and NEMA.
The related federal contract opportunity is a solicitation from the Department of Veterans Affairs to provide construction services to install parking garage cameras at the Lake Nona VA Medical Center in Orlando, Florida. Services include all labor, materials, tools, and equipment necessary to construct the project as further defined in the RFP. Proposals must offer to provide the specified construction work.
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01-01-18
SECTION 26 05 33
RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS
PART 1 - GENERAL
1.1 DESCRIPTION
| A. | This section specifies the furnishing, installation, and connection of conduit, fittings, and boxes, to form complete, coordinated, grounded raceway systems. Raceways are required for all wiring unless shown or specified otherwise. |
| B. | Definitions: The term conduit, as used in this specification, shall mean any or all of the raceway types specified. |
1.2 RELATED WORK
| A. | Section 06 10 00, ROUGH CARPENTRY: Mounting board for telephone closets. |
| B. | Section 07 60 00, FLASHING AND SHEET METAL: Fabrications for the deflection of water away from the building envelope at penetrations. |
| C. | Section 07 84 00, FIRESTOPPING: Sealing around penetrations to maintain the integrity of fire rated construction. |
| D. | Section 07 92 00, JOINT SEALANTS: Sealing around conduit penetrations through the building envelope to prevent moisture migration into the building. |
| E. | Section 09 91 00, PAINTING: Identification and painting of conduit and other devices. |
| F. | Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Conduits bracing. |
| G. | Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section of Division 26. |
| H. | Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path for possible ground fault currents. |
| I. | Section 26 05 41, UNDERGROUND ELECTRICAL CONSTRUCTION: Underground conduits. |
| J. | Section 31 20 00, EARTHWORK: Bedding of conduits. |
1.3 qualITY ASSURANCE A. Quality Assurance shall be in accordance with Paragraph, QUALIFICATIONS (PRODUCTS AND SERVICES) in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS.
1.4 SUBMITTALS
| A. | Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements: |
| 1. | Shop Drawings: |
| a. | Size and location of main feeders. |
| b. | Size and location of panels and pull-boxes. |
| c. | Layout of required conduit penetrations through structural elements. |
| d. | Submit the following data for approval: |
| 1) | Raceway types and sizes. |
| 2) | Conduit bodies, connectors and fittings. |
| 3) | Junction and pull boxes, types and sizes. |
| 2. | Certifications: Two weeks prior to final inspection, submit the following: |
| a. | Certification by the manufacturer that raceways, conduits, conduit bodies, connectors, fittings, junction and pull boxes, and all related equipment conform to the requirements of the drawings and specifications. |
| b. | Certification by the Contractor that raceways, conduits, conduit bodies, connectors, fittings, junction and pull boxes, and all related equipment have been properly installed. |
1.5 APPLICABLE PUBLICATIONS
| A. | Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by designation only. |
| B. | American Iron and Steel Institute (AISI): |
| S100-12 | North American Specification for the Design of Cold-Formed Steel Structural Members |
| C. | National Electrical Manufacturers Association (NEMA): |
| C80.1-15 | Electrical Rigid Steel Conduit |
| C80.3-15 | Steel Electrical Metal Tubing |
| C80.6-05 | Electrical Intermediate Metal Conduit |
| FB1-14 | Fittings, Cast Metal Boxes and Conduit Bodies for Conduit, Electrical Metallic Tubing and Cable |
| FB2.10-13 | Selection and Installation Guidelines for Fittings for use with Non-Flexible Conduit or Tubing (Rigid Metal Conduit, Intermediate Metallic Conduit, and Electrical Metallic Tubing) |
| FB2.20-14 | Selection and Installation Guidelines for Fittings for use with Flexible Electrical Conduit and Cable |
| TC-2-13 | Electrical Polyvinyl Chloride (PVC) Tubing and Conduit |
| TC-3-13 | PVC Fittings for Use with Rigid PVC Conduit and Tubing |
| D. | National Fire Protection Association (NFPA): |
| 70-17 | National Electrical Code (NEC) |
| E. | Underwriters Laboratories, Inc. (UL): |
| 1-05 | Flexible Metal Conduit |
| 5-16 | Surface Metal Raceway and Fittings |
| 6-07 | Electrical Rigid Metal Conduit - Steel |
| 50-15 | Enclosures for Electrical Equipment |
| 360-13 | Liquid-Tight Flexible Steel Conduit |
| 467-13 | Grounding and Bonding Equipment |
| 514A-13 | Metallic Outlet Boxes |
| 514B-12 | Conduit, Tubing, and Cable Fittings |
| 514C-14 | Nonmetallic Outlet Boxes, Flush-Device Boxes and Covers |
| 651-11 | Schedule 40 and 80 Rigid PVC Conduit and Fittings |
| 651A-11 | Type EB and A Rigid PVC Conduit and HDPE Conduit |
| 797-07 | Electrical Metallic Tubing |
| 1242-14 | Electrical Intermediate Metal Conduit - Steel |
PART 2 - PRODUCTS
2.1 MATERIAL
| A. | Conduit Size: In accordance with the NEC, but not less than 13 mm (0.5-inch) unless otherwise shown. Where permitted by the NEC, 13 mm (0.5-inch) flexible conduit may be used for tap connections to recessed lighting fixtures. |
| B. | Conduit: |
| 1. | Size: In accordance with the NEC, but not less than 13 mm (0.5-inch). |
| 2. | Electrical Metallic Tubing (EMT): Shall conform to UL 797 and NEMA C80.3. Maximum size not to exceed 105 mm (4 inches) and shall be permitted only with cable rated 600 V or less. |
| C. | Conduit Fittings: |
| 1. | Electrical Metallic Tubing Fittings: |
| a. | Fittings and conduit bodies shall meet the requirements of UL 514B, NEMA C80.3, and NEMA FB1. |
| b. | Only steel or malleable iron materials are acceptable. |
SPEC WRITER NOTE: Both compression and setscrew fittings are allowed, but one choice is to be made for a project. Fittings are to be of uniform type throughout the project.
| //c. | Compression Couplings and Connectors: Concrete-tight and rain-tight, with connectors having insulated throats.// |
| //c. | Setscrew Couplings and Connectors: Use setscrews of case-hardened steel with hex head and cup point, to firmly seat in wall of conduit for positive grounding.// |
| d. | Indent-type connectors or couplings are prohibited. |
| e. | Die-cast or pressure-cast zinc-alloy fittings or fittings made of "pot metal" are prohibited. |
| D. | Conduit Supports: |
| 1. | Parts and Hardware: Zinccoat or provide equivalent corrosion protection. |
| 2. | Individual Conduit Hangers: Designed for the purpose, having a preassembled closure bolt and nut, and provisions for receiving a hanger rod. |
| 3. | Multiple Conduit (Trapeze) Hangers: Not less than 38 mm x 38 mm (1.5 x 1.5 inches), 12-gauge steel, cold-formed, lipped channels; with not less than 9 mm (0.375-inch) diameter steel hanger rods. |
| 4. | Solid Masonry and Concrete Anchors: Selfdrilling expansion shields, or machine bolt expansion. |
| E. | Outlet, Junction, and Pull Boxes: |
| 1. | Comply with UL-50 and UL-514A. |
| 2. | Rustproof cast metal where required by the NEC or shown on drawings. |
| 3. | Sheet Metal Boxes: Galvanized steel, except where shown on drawings. |
| F. | Metal Wireways: Equip with hinged covers, except as shown on drawings. Include couplings, offsets, elbows, expansion joints, adapters, hold-down straps, end caps, and other fittings to match and mate with wireways as required for a complete system. |
PART 3 - EXECUTION
3.1 PENETRATIONS
| A. | Cutting or Holes: |
| 1. | Cut holes in advance where they should be placed in the structural elements, such as ribs or beams. Obtain the approval of the COR prior to drilling through structural elements. |
| 2. | Cut holes through concrete and masonry in new and existing structures with a diamond core drill or concrete saw. Pneumatic hammers, impact electric, hand, or manual hammer-type drills are not allowed, except when permitted by the COR where working space is limited. |
| B. | Firestop: Where conduits, wireways, and other electrical raceways pass through fire partitions, fire walls, smoke partitions, or floors, install a fire stop that provides an effective barrier against the spread of fire, smoke and gases as specified in Section 07 84 00, FIRESTOPPING. |
| C. | Waterproofing: At floor, exterior wall, and roof conduit penetrations, completely seal the gap around conduit to render it watertight, as specified in Section 07 92 00, JOINT SEALANTS. |
3.2 INSTALLATION, GENERAL
| A. | In accordance with NEC, NEMA, UL, as shown on drawings, and as specified herein. |
| B. | Raceway systems used for Essential Electrical Systems (EES) shall be entirely independent of other raceway systems. |
| C. | Install conduit as follows: |
| 1. | In complete mechanically and electrically continuous runs before pulling in cables or wires. |
| 2. | Unless otherwise indicated on the drawings or specified herein, installation of all conduits shall be concealed within finished walls, floors, and ceilings. |
| 3. | Flattened, dented, or deformed conduit is not permitted. Remove and replace the damaged conduits with new conduits. |
| 4. | Assure conduit installation does not encroach into the ceiling height head room, walkways, or doorways. |
| 5. | Cut conduits square, ream, remove burrs, and draw up tight. |
| 6. | Independently support conduit at 2.4 M (8 feet) on centers with specified materials and as shown on drawings. |
| 7. | Do not use suspended ceilings, suspended ceiling supporting members, lighting fixtures, other conduits, cable tray, boxes, piping, or ducts to support conduits and conduit runs. |
| 8. | Support within 300 mm (12 inches) of changes of direction, and within 300 mm (12 inches) of each enclosure to which connected. |
| 9. | Close ends of empty conduits with plugs or caps at the roughin stage until wires are pulled in, to prevent entry of debris. |
| 10. | Conduit installations under fume and vent hoods are prohibited. |
| 11. | Secure conduits to cabinets, junction boxes, pull-boxes, and outlet boxes with bonding type locknuts. For rigid steel and IMC conduit installations, provide a locknut on the inside of the enclosure, made up wrench tight. Do not make conduit connections to junction box covers. |
| 12. | Flashing of penetrations of the roof membrane is specified in Section 07 60 00, FLASHING AND SHEET METAL. |
| 13. | Conduit bodies shall only be used for changes in direction, and shall not contain splices. |
| D. | Conduit Bends: |
| 1. | Make bends with standard conduit bending machines. |
| 2. | Conduit hickey may be used for slight offsets and for straightening stubbed out conduits. |
| 3. | Bending of conduits with a pipe tee or vise is prohibited. |
| E. | Layout and Homeruns: |
| 1. | Install conduit with wiring, including homeruns, as shown on drawings. |
| 2. | Deviations: Make only where necessary to avoid interferences and only after drawings showing the proposed deviations have been submitted and approved by the COR. |
3.3 CONCEALED WORK INSTALLATION
| A. | In Concrete: |
| 1. | Conduit: Rigid steel, IMC, or EMT. Do not install EMT in concrete slabs that are in contact with soil, gravel, or vapor barriers. |
| 2. | Align and run conduit in direct lines. |
| 3. | Install conduit through concrete beams only: |
| a. | Where shown on the structural drawings. |
| b. | As approved by the //Resident Engineer// //COR// prior to construction, and after submittal of drawing showing location, size, and position of each penetration. |
| 4. | Installation of conduit in concrete that is less than 75 mm (3 inches) thick is prohibited. |
| a. | Conduit outside diameter larger than one-third of the slab thickness is prohibited. |
| b. | Space between conduits in slabs: Approximately six conduit diameters apart, and one conduit diameter at conduit crossings. |
| c. | Install conduits approximately in the center of the slab so that there will be a minimum of 19 mm (0.75-inch) of concrete around the conduits. |
| 5. | Make couplings and connections watertight. Use thread compounds that are UL approved conductive type to ensure low resistance ground continuity through the conduits. Tightening setscrews with pliers is prohibited. |
| B. | Above Furred or Suspended Ceilings and in Walls: |
| 1. | Conduit for Conductors 600 V and Below: Rigid steel, IMC, //rigid aluminum, //or EMT. Mixing different types of conduits in the same system is prohibited. |
| 2. | Align and run conduit parallel or perpendicular to the building lines. |
| 3. | Tightening set screws with pliers is prohibited. |
| 4. | For conduits running through metal studs, limit field cut holes to no more than 70% of web depth. Spacing between holes shall be at least 457 mm (18 inches). Cuts or notches in flanges or return lips shall not be permitted. |
3.4 EXPOSED WORK INSTALLATION
| A. | Unless otherwise indicated on drawings, exposed conduit is only permitted in mechanical and electrical rooms. |
| B. | Conduit for Conductors Above 600 V: Rigid steel// or rigid aluminum//. Mixing different types of conduits in the system is prohibited. |
| C. | Conduit for Conductors 600 V and Below: Rigid steel, IMC, //rigid aluminum,// or EMT. Mixing different types of conduits in the system is prohibited. |
| D. | Align and run conduit parallel or perpendicular to the building lines. |
| E. | Install horizontal runs close to the ceiling or beams and secure with conduit straps. |
| F. | Support horizontal or vertical runs at not over 2.4 M (8 feet) intervals. |
| G. | Surface Metal Raceways: Use only where shown on drawings. |
| H. | Painting: |
| 1. | Paint exposed conduit as specified in Section 09 91 00, PAINTING. |
| 2. | Paint all conduits containing cables rated over 600 V safety orange. Refer to Section 09 91 00, PAINTING for preparation, paint type, and exact color. In addition, paint legends, using 50 mm (2 inch) high black numerals and letters, showing the cable voltage rating. Provide legends where conduits pass through walls and floors and at maximum 6 M (20 feet) intervals in between. |
3.7 WET OR DAMP LOCATIONS
| A. | Use rigid steel or IMC conduits unless as shown on drawings. |
| B. | Provide sealing fittings to prevent passage of water vapor where conduits pass from warm to cold locations, i.e., refrigerated spaces, constant-temperature rooms, air-conditioned spaces, building exterior walls, roofs, or similar spaces. |
| C. | Use rigid steel or IMC conduit within 1.5 M (5 feet) of the exterior and below concrete building slabs in contact with soil, gravel, or vapor barriers, unless as shown on drawings. Conduit shall be half-lapped with 10 mil PVC tape before installation. After installation, completely recoat or retape any damaged areas of coating. |
| D. | Conduits run on roof shall be supported with integral galvanized lipped steel channel, attached to UV-inhibited polycarbonate or polypropylene blocks every 2.4 M (8 feet) with 9 mm (3/8-inch) galvanized threaded rods, square washer and locknut. Conduits shall be attached to steel channel with conduit clamps. |
3.8 EXPANSION JOINTS
| A. | Conduits 75 mm (3 inch) and larger that are secured to the building structure on opposite sides of a building expansion joint require expansion and deflection couplings. Install the couplings in accordance with the manufacturer's recommendations. |
| B. | Provide conduits smaller than 75 mm (3 inch) with junction boxes on both sides of the expansion joint. Connect flexible metal conduits to junction boxes with sufficient slack to produce a 125 mm (5 inch) vertical drop midway between the ends of the flexible metal conduit. Flexible metal conduit shall have a green insulated copper bonding jumper installed. In lieu of this flexible metal conduit, expansion and deflection couplings as specified above are acceptable. |
| C. | Install expansion and deflection couplings where shown. |
3.9 CONDUIT SUPPORTS
| A. | Safe working load shall not exceed one-quarter of proof test load of fastening devices. |
| B. | Use pipe straps or individual conduit hangers for supporting individual conduits. |
| C. | Support multiple conduit runs with trapeze hangers. Use trapeze hangers that are designed to support a load equal to or greater than the sum of the weights of the conduits, wires, hanger itself, and an additional 90 kg (200 lbs). Attach each conduit with Ubolts or other approved fasteners. |
| D. | Support conduit independently of junction boxes, pull-boxes, fixtures, suspended ceiling Tbars, angle supports, and similar items. |
| E. | Fasteners and Supports in Solid Masonry and Concrete: |
| 1. | New Construction: Use steel or malleable iron concrete inserts set in place prior to placing the concrete. |
| 2. | Existing Construction: |
| a. | Steel expansion anchors not less than 6 mm (0.25-inch) bolt size and not less than 28 mm (1.125 inch) in embedment. |
| b. | Power set fasteners not less than 6 mm (0.25-inch) diameter with depth of penetration not less than 75 mm (3 inch). |
| c. | Use vibration and shock-resistant anchors and fasteners for attaching to concrete ceilings. |
| F. | Hollow Masonry: Toggle bolts. |
| G. | Bolts supported only by plaster or gypsum wallboard are not acceptable. |
| H. | Metal Structures: Use machine screw fasteners or other devices specifically designed and approved for the application. |
| I. | Attachment by wood plugs, rawl plug, plastic, lead or soft metal anchors, or wood blocking and bolts supported only by plaster is prohibited. |
| J. | Chain, wire, or perforated strap shall not be used to support or fasten conduit. |
| K. | Spring steel type supports or fasteners are prohibited for all uses except horizontal and vertical supports/fasteners within walls. |
| L. | Vertical Supports: Vertical conduit runs shall have riser clamps and supports in accordance with the NEC and as shown. Provide supports for cable and wire with fittings that include internal wedges and retaining collars. |
3.10 BOX INSTALLATION
| A. | Boxes for Concealed Conduits: |
| 1. | Flush-mounted. |
| 2. | Provide raised covers for boxes to suit the wall or ceiling, construction, and finish. |
| B. | In addition to boxes shown, install additional boxes where needed to prevent damage to cables and wires during pulling-in operations or where more than the equivalent of 4-90 degree bends are necessary. |
| C. | Locate pullboxes so that covers are accessible and easily removed. Coordinate locations with piping and ductwork where installed above ceilings. |
| D. | Remove only knockouts as required. Plug unused openings. Use threaded plugs for cast metal boxes and snapin metal covers for sheet metal boxes. |
| E. | Outlet boxes mounted backtoback in the same wall are prohibited. A minimum 600 mm (24 inch) center-to-center lateral spacing shall be maintained between boxes. |
| F. | Flush-mounted wall or ceiling boxes shall be installed with raised covers so that the front face of raised cover is flush with the wall. Surface-mounted wall or ceiling boxes shall be installed with surface-style flat or raised covers. |
| G. | Minimum size of outlet boxes for ground fault circuit interrupter (GFCI) receptacles is 100 mm (4 inches) square x 55 mm (2.125 inches) deep, with device covers for the wall material and thickness involved. |
| H. | Stencil or install phenolic nameplates on covers of the boxes identified on riser diagrams; for example "SIGFA JB No. 1." |
| I. | On all branch circuit junction box covers, identify the circuits with black marker. |
E N D 26 05 33 - 1
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