VA 26 05 13-2010 MEDIUM VOLTAGE CABLES.pdf

1、09-10 26 05 13 - 1 SECTION 26 05 13 MEDIUM VOLTAGE CABLES 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 This section specifies the furnishing, inst

2、allation, and connection of medium voltage cables, splices, and terminations. 1.2 RELATED WORK A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirement and items that are common to more than one section of Division 26. B. Section 26 05 26, GROUNDING AND BONDING

3、FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path for possible ground fault currents. C. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits for medium voltage cables. D. Section 26 05 41, UNDERGROUND ELECTRICAL CONSTRUCTION: Manholes and

4、ducts for medium voltage cables. E. Section 31 20 00, EARTH MOVING: Bedding of conduits. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 FACTORY TESTS Medium voltage cables shall be thoroughly tested at the factory per NEM

5、A WC 74 to ensure that there are no electrical defects. Factory tests shall be certified. 1.5 SUBMITTALS A. In accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, submit the following: B. Shop Drawings: 1. Clearly present sufficient information to determine compliance with d

6、rawings and specifications. 2. Include product and installation information for cables, splices, terminations, and fireproofing tape. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 05 13 - 2 C. Samples: After approval and prior to installat

7、ion, furnish the /Resident Engineer/ /COTR/ with a minimum 12 in 300 mm length of each type and size of cable, along with the tag from the reel from which the sample was taken. The sample shall contain the manufacturers markings, showing all cable jacket information. D. Certifications: 1. Factory Te

8、st Reports: Prior to installation of the cables, deliver four copies of the manufacturers certified NEMA WC 71 or WC 74 standard factory test reports to the /Resident Engineer/ /COTR/. Certified copies of test data shall show conformance with the referenced standards and shall be approved prior to d

9、elivery of cable. 2. Compatibility: Provide certification from the cable manufacturer that the splices and terminations are approved for use with the cable. 3. Field Test Reports: Test reports shall comply with the paragraph entitled “Acceptance Checks and Tests.” After testing, submit four certifie

10、d copies to the /Resident Engineer/ /COTR/ of each of the graphs specified under field testing. 4. After splices and terminations have been installed and tested, deliver four copies of a certificate by the contractor to the /Resident Engineer/ /COTR/ which includes the following: a. A statement that

11、 the materials, detail drawings, and printed instructions used are those contained in the kits approved for this contract. b. A statement that each splice and each termination was completely installed in a single continuous work period by a single qualified worker without any overnight interruption.

12、 c. A statement that field-made splices and terminations conform to the following requirements: 1) Pencil the cable insulation precisely. 2) Connector installations: a) Use tools that are designed for the connectors being installed. b) Round and smooth the installed connectors to minimize localized

13、voltage stressing of the insulating materials. 3) Remove contaminants from all surfaces within the splices and terminations before installing the insulating materials. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 05 13 - 3 4) Solder block

14、 throughout stranded grounding wires that might penetrate the splicing and terminating materials. 5) Use mirrors to observe the installation of materials on the backsides of the splices and terminations. 6) Eliminate air voids throughout the splices and terminations. 7) Stretch each layer of tape pr

15、operly during installation. d. List all the materials purchased and installed for the splices and terminations for this contract, including the material descriptions, manufacturers names, catalog numbers, and total quantities. E. Installer Approval: 1. Employees who install splices and terminations

16、and test the cables shall have not fewer than five years of experience splicing and terminating cables equivalent to those being spliced and terminated, including experience with the materials in the kits. 2. Furnish satisfactory proof of such experience for each employee who splices or terminates t

17、he cables. SPEC WRITER NOTE: The A/E shall confirm with the serving utility company as to which entity specifies, purchases, furnishes, installs, inspects, and approves service entrance cabling. /F. Power Company Approval: Prior to construction, obtain written approval from the power company supplyi

18、ng electrical service for the following items: 1. Service entrance cables. Obtain the power companys written approval on the submittal papers for the cables before submitting them for /Resident Engineer/ /COTR/ approval. 2. A list of employees who will splice and terminate the service entrance cable

19、s./ 1.6 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: American Society for Testing and Materials (ASTM):

20、 B3-01 (R2007) Standard Specification for Soft or Annealed Copper Wire B. Institute of Electrical and Electronics Engineers, Inc. (IEEE): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 05 13 - 4 386-95 (R2001) . Separable Insulated Connecto

21、r Systems for Power Distribution Systems above 600 V 400-01 . Guide for Field Testing and Evaluation of the Insulation of Shielded Power Cable Systems 400.2-05 . Guide for Field Testing of Shielded Power Cable Systems Using Very Low Frequency (VLF) 400.3-06 . Guide for Partial Discharge Testing of S

22、hielded Power Cable Systems in a Field Environment 404-00 . Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500-500,000 Volts C. National Electrical Manufacturers Association (NEMA): WC 71-99 . Standard for Non-Shielded Cables Rated 2001-5000 Volts for Use in the Distribution of Elect

23、rical Energy (ICEA S-96-659) WC 74-06 . 5-46 KV Shielded Power Cable for Use in the Transmission and Distribution of Electrical Energy (ICEA S-93-969) D. National Fire Protection Association (NFPA): 70-08 National Electrical Code (NEC) E. Underwriters Laboratories (UL): 1072-06 . Medium-Voltage Powe

24、r Cables 1.7 SHIPMENT AND STORAGE A. Cable shall be shipped on reels such that it is protected from mechanical injury. Each end of each length of cable shall be hermetically sealed with manufacturers end caps and securely attached to the reel. B. Cable stored and/or cut on site shall have the ends t

25、urned down, and sealed with cable manufacturers standard cable end seals, or field-installed heat-shrink cable end seals. SPEC WRITER NOTE: Indicate the cable type abbreviation on the drawings. Edit the paragraphs below to conform with project requirements. PART 2 - PRODUCTS 2.1 MEDIUM VOLTAGE CABLE

26、 A. Medium voltage cable shall be in accordance with the NEC and NEMA WC 71, WC 74, and UL 1072. B. Single conductor stranded copper conforming to ASTM B3. C. Voltage Rating: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 05 13 - 5 /5,000 V

27、 cable shall be used on 4,160 V distribution systems./ /15,000 V cable shall be used on all distribution systems with voltages ranging from 5,000 V to 15,000 V./ /25,000 V cable shall be used on 25,000 V distribution systems./ /35,000 V cable shall be used on 35,000 V distribution systems./ D. Insul

28、ation: 1. Insulation level shall be 133%. 2. Types of insulation: a. Cable type abbreviation, EPR: Ethylene propylene rubber insulation shall be thermosetting, light and heat stabilized. b. Cable type abbreviation, CCLP: Polyethylene insulation shall be thermosetting, light and heat stabilized, and

29、chemically cross-linked. c. In wet locations, anti-tree CCLP or EPR shall be used. d. Cable type abbreviation, XLPE: cross-linked polyethylene insulated shielded shall be thermosetting, light and heat stabilized and chemically cross-linked. SPEC WRITER NOTE: Provide specification for series-type lig

30、hting cable and accessories that will suitably extend the existing installation. /e. For series-type outdoor lighting systems, install direct-burial, series lighting system type cables as shown on the drawings. The cables shall be designed for direct burial whether or not they are installed in under

31、ground raceways./ E. Conductors and insulation shall be wrapped separately with semi-conducting tape. F. Insulation shall be wrapped with non-magnetic, metallic shielding tape, helically-applied over semi-conducting insulation shield. G. Heavy duty, overall protective jacket of chlorosulphonated pol

32、yethylene or polyvinyl chloride shall enclose every cable. The manufacturers name, cable type and size, and other pertinent information shall be marked or molded clearly on the overall protective jacket. H. Cable temperature ratings for continuous operation, emergency overload operation, and short c

33、ircuit operation shall be not less than the NEC, NEMA WC 71, or NEMA WC 74 standard for the respective cable. 2.2 SPLICES AND TERMINATIONS A. The materials shall be compatible with the cables. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26

34、05 13 - 6 B. In locations where moisture might be present, the splices shall be watertight. In manholes and handholes, the splices shall be submersible. C. Where the Government determines that unsatisfactory splices and terminations have been installed, the contractor shall replace the unsatisfactor

35、y splices and terminations with approved material at no additional cost to the Government. D. Splices and Terminations: 1. Materials shall be designed for the cables being spliced and terminated, and shall be suitable for the prevailing environmental conditions. SPEC WRITER NOTE: Choose type of spli

36、ces and terminations to meet project requirements. 2. Splices: a. Shall comply with IEEE 404. Include all components required for complete splice, with detailed instructions. /b. Heat-shrink splice: Uniform cross-section, polymeric splicing kit with outer heat-shrink jacket./ /c. Cold-shrink splice:

37、 Premolded, cold-shrink-rubber, in-line splicing kit./ 3. Terminations: a. Shall comply with IEEE 48. Include shield ground strap for shielded cable terminations. /b. Class 1 terminations for indoor use: Modular type, furnished as a kit, with stress-relief tube; multiple, molded-silicone rubber, ins

38、ulator modules; and compression-type connector./ /c. Class 1 terminations for indoor use: Heat-shrink type with heat-shrink inner stress control and outer nontracking tubes; multiple, molded, nontracking skirt modules; and compression-type connector./ /d. Class 1 terminations for indoor use: Kit wit

39、h stress-relief tube, nontracking insulator tube, shield ground strap, compression-type connector, and end seal./ /e. Class 3 terminations for outdoor use: Kit with stress cone and compression-type connector./ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from

40、IHS-,-,-09-10 26 05 13 - 7 /f. Load-break terminations for indoor and outdoor use: Elbow-type unit with test point and 200-A load make/break and continuous-current rating./ /g. Dead-break terminations for indoor and outdoor use: Elbow-type unit with test point and 600-A continuous-current rating./ 2

41、.3 FIREPROOFING TAPE Fireproofing tape shall be flexible, non-corrosive, self-extinguishing, arcproof, and fireproof intumescent elastomer. Securing tape shall be glass cloth electrical tape not less than 7 mils 0.18 mm thick, and 0.75 in 19 mm wide. PART 3 - EXECUTION 3.1 GENERAL A. Installation sh

42、all be in accordance with the NEC, as shown on the drawings, and per cable manufacturers instructions. B. Cable shall be installed in conduit above grade and duct bank below grade. All cables of a feeder shall be pulled simultaneously. C. Splice the cables only in manholes and accessible pullboxes.

43、D. Ground shields in accordance with Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS. E. Cable maximum pull length, maximum pulling tension, and minimum bend radius shall conform with the recommendations of the cable manufacturer. F. Use suitable lubricating compounds on the cables to

44、 prevent pulling damage. Provide compounds that are not injurious to the cable jacket and do not harden or become adhesive. G. Seal the cable ends prior to pulling, to prevent the entry of moisture or lubricant. 3.2 PROTECTION DURING SPLICING OPERATIONS Blowers shall be provided to force fresh air i

45、nto manholes where free movement or circulation of air is obstructed. Waterproof protective coverings shall be available on the work site to provide protection against moisture while a splice is being made. Pumps shall be used to keep manholes dry during splicing operations. Under no conditions shal

46、l a splice or termination be made that exposes the interior of a cable to moisture. A manhole ring at least 6 in 150 mm above ground shall be used around the manhole entrance to keep surface water from entering the manhole. Unused ducts shall be plugged and water seepage through ducts in use shall b

47、e stopped before splicing. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 05 13 - 8 3.3 PULLING CABLES IN DUCTS AND MANHOLES A. Cables shall be pulled into ducts with equipment designed for this purpose, including power-driven winches, cabl

48、e-feeding flexible tube guides, cable grips, pulling eyes, and lubricants. A sufficient number of trained personnel and equipment shall be employed to ensure the careful and proper installation of the cable. B. Cable reels shall be set up at the side of the manhole opening and above the duct or hatc

49、h level, allowing cables to enter through the opening without reverse bending. Flexible tube guides shall be installed through the opening in a manner that will prevent cables from rubbing on the edges of any structural member. C. Cable shall be unreeled from the top of the reel. Pay-out shall be carefully controlled. Cables t