VA 27 05 33-2005 RACEWAYS AND BOXES FOR COMMUNICATIONS SYSTEMS.pdf

1、12-05M 27 05 33 - 1 SECTION 27 05 33 RACEWAYS AND BOXES FOR COMMUNICATIONS SYSTEMS SPEC WRITER NOTE: Delete between /-/if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION A. This section spe

2、cifies the furnishing, installation, and connection of conduit, fittings, and boxes to form complete, coordinated, raceway systems. Raceways are required for all communications cabling unless shown or specified otherwise. B. Definitions: The term conduit, as used in this specification, shall mean an

3、y or all of the raceway types specified. 1.2 RELATED WORK A. Bedding of conduits: Section 31 20 00, EARTH MOVING. B. Mounting board for communication closets: Section 06 10 00, ROUGH CARPENTRY. C. Sealing around penetrations to maintain the integrity of fire rated construction: Section 07 84 00, FIR

4、ESTOPPING. D. Fabrications for the deflection of water away from the building envelope at penetrations: Section 07 60 00, FLASHING AND SHEET METAL. E. Sealing around conduit penetrations through the building envelope to prevent moisture migration into the building: Section 07 92 00, JOINT SEALANTS.

5、F. Identification and painting of conduit and other devices: Section 09 91 00, PAINTING. G. General electrical requirements and items that is common to more than one section of Division 27: Section 27 05 11, REQUIREMENTS FOR COMMUNICATIONS INSTALLATIONS. H. Requirements for personnel safety and to p

6、rovide a low impedance path for possible ground fault currents: Section 27 05 26, GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS. 1.3 SUBMITTALS In accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES, furnish the following: A. Shop Drawings: 1. Size and location of panels an

7、d pull boxes 2. Layout of required conduit penetrations through structural elements. 3. The specific item proposed and its area of application shall be identified on the catalog cuts. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-05M 27 05 33 -

8、2 B. Certification: Prior to final inspection, deliver to the / Resident Engineer / COTR / four copies of the certification that the material is in accordance with the drawings and specifications and has been properly installed. 1.4 APPLICABLE PUBLICATIONS A. Publications listed below (including ame

9、ndments, addenda, revisions, supplements and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only. B. National Fire Protection Association (NFPA): 70-05 National Electrical Code (NEC) C. Underwriters Laboratories, I

10、nc. (UL): 1-03. Flexible Metal Conduit 5-01. Surface Metal Raceway and Fittings 6-03. Rigid Metal Conduit 50-03 Enclosures for Electrical Equipment 360-03. Liquid-Tight Flexible Steel Conduit 467-01. Grounding and Bonding Equipment 514A-01 Metallic Outlet Boxes 514B-02 Fittings for Cable and Conduit

11、 514C-05 Nonmetallic Outlet Boxes, Flush-Device Boxes and Covers 651-02. Schedule 40 and 80 Rigid PVC Conduit 651A-03 Type EB and A Rigid PVC Conduit and HDPE Conduit 797-03. Electrical Metallic Tubing 1242-00 Intermediate Metal Conduit D. National Electrical Manufacturers Association (NEMA): TC-3-0

12、4 PVC Fittings for Use with Rigid PVC Conduit and Tubing FB1-03. Fittings, Cast Metal Boxes and Conduit Bodies for Conduit, Electrical Metallic Tubing and Cable PART 2 - PRODUCTS 2.1 MATERIAL SPEC WRITER NOTE: Coordinate with Section 27 10 00, STRUCTURED CABLING to insure that type THW insulation is

13、 not specified for use in 13 mm (1/2 inch) conduit. A. Conduit Size: In accordance with the NEC, but not less than 13 mm (1/2 inch) unless otherwise shown. Where permitted by the NEC, 13 mm Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-05M 27 05

14、 33 - 3 (1/2 inch) flexible conduit may be used for tap connections to recessed lighting fixtures. B. Conduit: 1. Rigid galvanized steel: Shall Conform to UL 6, ANSI C80.1. 2. Rigid aluminum: Shall Conform to UL 6A, ANSI C80.5. 3. Rigid intermediate steel conduit (IMC): Shall Conform to UL 1242, ANS

15、I C80.6. 4. Electrical metallic tubing (EMT): Shall Conform to UL 797, ANSI C80.3. Maximum size not to exceed 105 mm (4 inch) and shall be permitted only with cable rated 600 volts or less. 5. Flexible galvanized steel conduit: Shall Conform to UL 1. 6. Liquid-tight flexible metal conduit: Shall Con

16、form to UL 360. 7. Direct burial plastic conduit: Shall conform to UL 651 and UL 651A, heavy wall PVC or high density polyethylene (PE). 8. Surface metal raceway: Shall Conform to UL 5. C. Conduit Fittings: 1. Rigid steel and IMC conduit fittings: a. Fittings shall meet the requirements of UL 514B a

17、nd ANSI/ NEMA FB1. a. Standard threaded couplings, locknuts, bushings, and elbows: Only steel or malleable iron materials are acceptable. Integral retractable type IMC couplings are also acceptable. b. Locknuts: Bonding type with sharp edges for digging into the metal wall of an enclosure. c. Bushin

18、gs: Metallic insulating type, consisting of an insulating insert molded or locked into the metallic body of the fitting. Bushings made entirely of metal or nonmetallic material are not permitted. d. Erickson (union-type) and set screw type couplings: Approved for use in concrete are permitted for us

19、e to complete a conduit run where conduit is installed in concrete. Use set screws of case hardened steel with hex head and cup point to firmly seat in conduit wall for positive ground. Tightening of set screws with pliers is prohibited. e. Sealing fittings: Threaded cast iron type. Use continuous d

20、rain type sealing fittings to prevent passage of water vapor. In concealed work, install fittings in flush steel boxes with blank cover plates having the same finishes as that of other electrical plates in the room. Provided by IHSNot for ResaleNo reproduction or networking permitted without license

21、 from IHS-,-,-12-05M 27 05 33 - 4 2. Rigid aluminum conduit fittings: a. Standard threaded couplings, locknuts, bushings, and elbows: Malleable iron, steel or aluminum alloy materials; Zinc or cadmium plate iron or steel fittings. Aluminum fittings containing more than 0.4 percent copper are prohibi

22、ted. b. Locknuts and bushings: As specified for rigid steel and IMC conduit. c. Set screw fittings: Not permitted for use with aluminum conduit. 3. Electrical metallic tubing fittings: a. Fittings shall meet the requirements of UL 514B and ANSI/ NEMA FB1. b. Only steel or malleable iron materials ar

23、e acceptable. c. Couplings and connectors: Concrete tight and rain tight, with connectors having insulated throats. Use gland and ring compression type couplings and connectors for conduit sizes 50 mm (2 inches) and smaller. Use set screw type couplings with four set screws each for conduit sizes ov

24、er 50 mm (2 inches). Use set screws 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. 4.

25、Flexible steel conduit fittings: a. Conform to UL 514B. Only steel or malleable iron materials are acceptable. b. Clamp type, with insulated throat. 5. Liquid-tight flexible metal conduit fittings: a. Fittings shall meet the requirements of UL 514B and ANSI/ NEMA FB1. b. Only steel or malleable iron

26、 materials are acceptable. c. Fittings must incorporate a threaded grounding cone, a steel or plastic compression ring, and a gland for tightening. Connectors shall have insulated throats. 6. Direct burial plastic conduit fittings: a. Fittings shall meet the requirements of UL 514C and NEMA TC3. b.

27、As recommended by the conduit manufacturer. 7. Surface metal raceway fittings: As recommended by the raceway manufacturer. 8. Expansion and deflection couplings: a. Conform to UL 467 and UL 514B. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-05M

28、 27 05 33 - 5 b. Accommodate, 19 mm (0.75 inch) deflection, expansion, or contraction in any direction, and allow 30 degree angular deflections. c. Include internal flexible metal braid sized to guarantee conduit ground continuity and fault currents in accordance with UL 467, and the NEC code tables

29、 for ground conductors. d. Jacket: Flexible, corrosion-resistant, watertight, moisture and heat resistant molded rubber material with stainless steel jacket clamps. D. Conduit Supports: 1. Parts and hardware: Zinc-coat or provide equivalent corrosion protection. 2. Individual Conduit Hangers: Design

30、ed for the purpose, having a pre-assembled closure bolt and nut, and provisions for receiving a hanger rod. 3. Multiple conduit (trapeze) hangers: Not less than 38 mm by 38 mm (1-1/2 by 1-1/2 inch), 12 gage steel, cold formed, lipped channels; with not less than 9 mm (3/8 inch) diameter steel hanger

31、 rods. 4. Solid Masonry and Concrete Anchors: Self-drilling expansion shields, or machine bolt expansion. E. Outlet, Junction, and Pull Boxes: 1. UL-50 and UL-514A. 2. Cast metal where required by the NEC or shown, and equipped with rustproof boxes. 3. Sheet metal boxes: Galvanized steel, except whe

32、re otherwise shown. 4. Flush mounted wall or ceiling boxes shall be installed with raised covers so that 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. F. Wireways: Equip with hinged covers, except

33、 where removable covers are shown. SPEC WRITER NOTE: Use non-detectable type for cemetery projects only. G. Warning Tape: Standard, 4-Mil polyethylene 76 mm (3 inch) wide tape / detectable / non-detectable / type, red with black letters, and imprinted with “CAUTION BURIED COMMUNICATIONS CABLE BELOW”

34、. PART 3 - EXECUTION 3.1 PENETRATIONS A. Cutting or Holes: 1. Locate holes in advance where they are proposed in the structural sections such as ribs or beams. Obtain the approval of the / Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-05M 27 05

35、33 - 6 Resident Engineer / COTR / prior to drilling through structural sections. 2. Cut holes through concrete and masonry in new and existing structures with a diamond core drill or concrete saw. Pneumatic hammer, impact electric, hand or manual hammer type drills are not allowed, except where perm

36、itted by the / Resident Engineer / COTR / as required by limited working space. B. Fire Stop: Where conduits, wireways, and other communications raceways pass through fire partitions, fire walls, smoke partitions, or floors, install a fire stop that provides an effective barrier against the spread o

37、f fire, smoke and gases as specified in Section 07 84 00, FIRESTOPPING, with rock wool fiber or silicone foam sealant only. Completely fill and seal clearances between raceways and openings with the fire stop material. SPEC WRITER NOTE: Verify that roof penetration details are shown on the architect

38、ural drawings. C. Waterproofing: At floor, exterior wall, and roof conduit penetrations, completely seal clearances around the conduit and make watertight as specified in Section 07 92 00, JOINT SEALANTS. 3.2 INSTALLATION, GENERAL A. Install conduit as follows: 1. In complete runs before pulling in

39、cables or wires. 2. Flattened, dented, or deformed conduit is not permitted. Remove and replace the damaged conduits with new undamaged material. 3. Assure conduit installation does not encroach into the ceiling height head room, walkways, or doorways. 4. Cut square with a hacksaw, ream, remove burr

40、s, and draw up tight. 5. Mechanically continuous. 6. Independently support conduit at 80” on center. Do not use other supports i.e., (suspended ceilings, suspended ceiling supporting members, lighting fixtures, conduits, mechanical piping, or mechanical ducts). 7. Support within 300 mm (1 foot) of c

41、hanges of direction, and within 300 mm (1 foot) of each enclosure to which connected. 8. Close ends of empty conduit with plugs or caps at the rough-in stage to prevent entry of debris, until wires are pulled in. 9. Conduit installations under fume and vent hoods are prohibited. 10. Secure conduits

42、to cabinets, junction boxes, pull boxes and outlet boxes with bonding type locknuts. For rigid and IMC conduit installations, provide a locknut on the inside of the enclosure, made Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-05M 27 05 33 - 7 u

43、p wrench tight. Do not make conduit connections to junction box covers. 11. Flashing of penetrations of the roof membrane is specified in Section 07 60 00, FLASHING AND SHEET METAL. 12. Do not use aluminum conduits in wet locations. 13. Unless otherwise indicated on the drawings or specified herein,

44、 all conduits shall be installed concealed within finished walls, floors and ceilings. B. 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

45、is prohibited. C. Layout and Homeruns: 2. Deviations: Make only where necessary to avoid interferences and only after drawings showing the proposed deviations have been submitted approved by the / Resident Engineer / COTR /. 3.3 CONCEALED WORK INSTALLATION A. In Concrete: 1. Conduit: Rigid steel, IM

46、C 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 when the following occurs: a. Where shown on the structural drawings. b. As approved by the / Resident Engi

47、neer / COTR / 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 1/3 of the slab thickness is prohibited

48、. b. Space between conduits in slabs: Approximately six conduit diameters apart, except 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 (3/4 inch) of concrete around the conduits. 5. Make couplings and co

49、nnections watertight. Use thread compounds that are UL approved conductive type to insure low resistance ground continuity through the conduits. Tightening set screws with pliers is prohibited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-05M 27 05 33 - 8 B. Furred or Suspended Ceilings and in Walls: 1. Conduit for co