ASTM F855-2014 Standard Specifications for Temporary Protective Grounds to Be Used on De-energized Electric Power Lines and Equipment 《断开的电力线及设备上使用的临时保护性接地装置的标准规格》.pdf

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1、Designation: F855 09F855 14Standard Specifications forTemporary Protective Grounds to Be Used on De-energizedElectric Power Lines and Equipment 1This standard is issued under the fixed designation F855; the number immediately following the designation indicates the year of originaladoption or, in th

2、e case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These specifications cover the equipment making up the temporary grounding system used on

3、de-energized electric powerlines, electric supply stations, and equipment.1.2 It is common practice for the users of protective grounding equipment to prepare complete instructions and regulations togovern in detail the correct use and maintenance of such equipment.1.3 The uses and maintenance of th

4、is equipment are beyond the scope of these specifications.1.4 These specifications for a system of protective grounding utilizing copper cables are covered in four parts, as follows:SectionsClamps for Temporary Protective Grounds 4 16Ferrules for Temporary Protective Grounds 17 30Cables for Temporar

5、y Protective Grounds 31 39Protective Grounds (Complete Assembly With Clamps, Ferrules,and Cable)40 521.5 Each of the four parts is an entity of itself, but is listed as a part of the system for completeness and clarification.1.6 Currents presented in Table 1 are based upon cable melting times, as de

6、termined from equations by I. M. Onderdonk andare to used in situations involving an asymmetry value less than 20 % (X/R 1.8). See Appendix X3.1.6.1 Currents presented in Table 2 are based upon the values from EPRI Project RP2446 Computer Program RTGC “ADesktopComputer Program for Calculating Rating

7、 of Temporary Grounding Cables” and are to be used in situations involving anasymmetry value greater then 20 % (X/R 1.8), see Appendix X4.NOTE 1Table 1 represents the clamp and assembly ratings that existed prior to this revision. Table 2 represents new ratings now required for highX/R situations.1.

8、6.2 See Appendix X3 and Appendix X4 for a discussion of these topics.1.7 The values stated in Newton-Meter units are to be regarded as the standard. The values in parentheses are the inch-poundunits.1.8 The following precautionary caveat pertains to the test method portions, Sections 12 and 25 of th

9、ese specifications:Thisstandard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.2.

10、Referenced Documents2.1 ASTM Standards:2B172 Specification for Rope-Lay-Stranded Copper Conductors Having Bunch-Stranded Members, for Electrical ConductorsB173 Specification for Rope-Lay-Stranded Copper Conductors Having Concentric-Stranded Members, for Electrical Conduc-tors1 These specifications a

11、re under the jurisdiction ofASTM Committee F18 on Electrical Protective Equipment for Workers and are the direct responsibility of SubcommitteeF18.45 on Mechanical Apparatus.Current edition approved May 1, 2009Oct. 1, 2014. Published July 2009November 2014. Originally approved in 1983. Last previous

12、 edition approved in 20042009 asF855 04.F855 09. DOI: 10.1520/F0855-09.10.1520/F0855-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summar

13、y page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends t

14、hat users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D470 Test Methods for

15、 Crosslinked Insulations and Jackets for Wire and CableD753 Specification for General Purpose Polychloroprene Jacket for Wire and Cable (Withdrawn 1984)3D2219 Specification for Poly(Vinyl Chloride) Insulation for Wire and Cable, 60C OperationD2633 Test Methods for Thermoplastic Insulations and Jacke

16、ts for Wire and CableD2768 Specification for General-Purpose Ethylene-Propylene Rubber Jacket for Wire and Cable (Withdrawn 2007)3D2770 Specification for Ozone-Resisting Ethylene-Propylene Rubber Integral Insulation and Jacket for Wire and Cable(Withdrawn 2007)3E8/E8M Test Methods for Tension Testin

17、g of Metallic Materials2.2 ANSI Standard:4C 37.09 Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Basis2.3 ICEA/NEMA Standard:5ICEA S-19-81/NEMAWC 3-80 (R 1986) Rubber Insulated Wire and Cable for the Transmission and Distribution of ElectricalEnergy2.4 IEC Standa

18、rd:6IEC 61230 Ed. 2, 2008, Portable Equipment for Earthing or Earthing and Short-Circuiting2.5 IEEE Standard:7IEEE 386 Standard for Separable Insulated Connector Systems for Power Distribution Systems Above 600VIEEE 1048 Guide for Protective Grounding of Power LinesIEEE 1246 Guide for Temporary Prot

19、ective Grounding Systems Used in Substations3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 continuous current ratingdesignated RMS current which can be carried continuously under specified conditions.3.1.2 protective ground assemblya temporary electrical connection between a

20、source of potential energization and the earth,rated for the maximum anticipated fault current or continuous induced current, or both.3.1.2.1 DiscussionThroughout this specification, kc mil = 1000 circular mils.3.1.3 protective grounding equipmentdevices installed temporarily on de-energized electri

21、c power circuits for the purposes ofpotential equalization and to conduct a short circuit current for a specified duration (time).3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from American National Standards Institute, 11 West 42nd St., 13th Floor

22、, New York, NY 10036.5 Available from Insulated Cable Engineers Assoc., P.O. Box P, South Yarmouth, MA 02664.6 Available from International Electrotechnical Commission (IEC), 3 rue de Varemb, Case postale 131, CH-1211, Geneva 20, Switzerland, http:/www.iec.ch.7 Available from Institute of Electrical

23、 and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http:/www.ieee.org.TABLE 1 Protective Ground Cable, Ferrule, Clamp and Assembly Ratings for Symmetrical CurrentGradeGrounding Clamp TorqueStrength, min Short Circuit PropertiesAContinuousCurrentRating, A

24、RMS, 60HzYieldB UltimateWithstand Rating, SymmetricalkARMS, 60 HzUltimate Rating CapacityCD , SymmetricalkARMS, 60 Hzlbfin. nm lbfin. nm15cycles(250 ms)30 cycles(500ms)Copper CableSize15cycles(250ms)30cycles(500ms)60cycles(1 s)MaximumCopper TestCable Size1 280 32 330 37 14 10 #2 18 13 9 2/0 2002 280

25、 32 330 37 21 15 1/0 29 21 14 4/0 2503 280 32 330 37 27 20 2/0 37 26 18 4/0 3004 330 37 400 45 34 25 3/0 47 33 23 250 kcmil 3505 330 37 400 45 43 30 4/0 59 42 29 250 kcmil 4006 330 37 400 45 54 39 250 kcmil or2 2/070 49 35 350 kcmil 4507 330 37 400 45 74 54 350 kcmil or2 4/098 69 48 550 kcmil 550A W

26、ithstand and ultimate short circuit properties are based on performance with surges not exceeding 20 % asymmetry factor (see 9.1 and 12.3.4.2).B Yield shall mean no permanent deformation such that the clamp cannot be reused throughout its entire range of application.C Ultimate rating represents a sy

27、mmetrical current which the assembly or individual components shall carry for the specified time.D Ultimate values are based upon application of Onderdonks equation to 98 % of nominal circular mil area allowed by Specifications B172 and B173.F855 142TABLE 2 Ultimate Assembly Rating for High X/R Rati

28、o ApplicationsHigh Asymmetrical Test RequirementsGrade SizeRatingRatedCurrent(kA)X/R = 301st Cycle Current Peak(kA)X 2.69Last CycleCurrent Peak(kA)TestDuration (cycles)1H No. 2 15 41 23 152H 1/0 25 65 37 153H 2/0 31 84 46 154H 3/0 39 105 58 155H 4/0 47 126 70 156H 250 MCM 55 148 82 157H 350 MCM 68 1

29、83 101 15TABLE 2 Ultimate Assembly Rating for High X/R Ratio ApplicationsGradeSizeRatingRatedCurrent(kA)High Asymmetrical Test RequirementsX/R = 30Cycle Current PeakValues (kA)Rating X 2.69TestDuration(cycles)12t(Mega amps2-s)1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th1H 15 41

30、37 34 32 30 28 27 26 25 25 24 24 23 23 23 15 742H 25 68 62 57 53 50 47 45 43 42 41 40 39 38 38 38 15 2083H 31 84 76 70 65 61 58 56 53 52 50 49 48 47 47 46 15 3124H 39 105 96 88 82 77 73 70 67 65 63 62 61 60 59 58 15 5015H 47 127 116 106 99 93 88 84 81 78 76 74 73 72 71 70 15 7286H 55 148 135 124 116

31、 109 103 98 94 91 89 87 85 84 83 82 15 9977H 68 183 167 154 143 134 127 121 117 113 110 107 105 104 102 101 15 1523F855143NOTE 1The above current values are based on electromechanical test values.F855144NOTE 2Assemblies that have been subjected to these shall not be re-used.F855145NOTE 3For use with

32、 currents exceeding 20 % asymmetry factor.F855146NOTE 4See X4.7.2 for additional information.F855147NOTE 5Alternate testing circuits are available for laboratories that cannot achieve the above requirements. See Appendix X4 for details.F8551483.1.4 time to failurefailure time of the cable is the tim

33、e between the initiation of current flow and the instant at which arcingbegins.3.1.5 ultimate capacitythis represents a current which it is calculated the component is capable of conducting for the specifiedtime. It is expected that component damage may result. The component shall not be reused, exc

34、ept in test situations.3.1.6 withstand ratingthis represents a near symmetrical current which shall be conducted without any component beingdamaged sufficiently to prevent being operable and reusable. The protective ground shall be capable of passing a second test atthis current after being cooled t

35、o ambient temperature.CLAMPS FOR TEMPORARY PROTECTIVE GROUNDS4. Scope4.1 This specification covers clamps used with ferrules and elastomer or thermoplastic covered flexible cable in the manufactureof protective grounds installed temporarily for protective grounding of de-energized circuits.5. Classi

36、fication5.1 Clamps are furnished in, but not limited to, three types according to their function and method of installation, as follows:5.1.1 Type IClamps for installation on de-energized conductors equipped with eyes for installation with removable hot sticks.5.1.2 Type IIClamps for installation on

37、 de-energized conductors having permanently mounted hot sticks.5.1.3 Type IIIClamps for installation on permanently grounded conductors or metal structures with tee handles, and eyes orsquare or hexagon head screw(s), or both.5.1.4 Other types of special clamps, such as those for cluster grounds or

38、for underground equipment grounding, may be made,tested, and certified by the manufacturer as meeting the requirements of this specification.5.1.5 Separable insulated connectors used in manufacturing underground equipment grounding assemblies shall meet therequirements of IEEE 386.5.2 Clamps are fur

39、nished in grades according to mechanical strengths, short circuit capabilities, and duration of faults, asindicated in Table 1.5.3 Clamps are furnished in two classes according to the characteristics of the main contact jaws:5.3.1 Class AClamp jaws with smooth contact surfaces.5.3.2 Class BClamp jaw

40、s with serrations, or cross hatching, or other means intended to abrade or bite through corrosionproducts on the surfaces of the conductor being clamped.6. Sizes6.1 Clamp size is the combination of the main contact and cable size ranges as listed by the manufacturers. It should be notedthat the main

41、 contact may connect to a cable or bus bar or be used at the “ground end” to connect to a variety of conductivegrounded objects.7. Ordering Information7.1 Orders for clamps under this specification shall include this ASTM designation and the following information:7.1.1 Quantity,7.1.2 Name (grounding

42、 clamp),7.1.3 Main contact size ranges, conductor descriptions, and materials which are to be clamped by main contact,7.1.4 Cable size, material, and description by which clamps are to be assembled,7.1.5 Type (see 5.1),7.1.6 Grade (see 5.2 and Table 1 or Table 2),7.1.7 Class (see 5.3),7.1.8 Asymmetr

43、ical current or other supplementary requirements, if applicable. (See Supplementary Requirements S1 to S10for styles and designs.)NOTE 2A typical ordering description is as follows: 100 Grounding Clamps, Main contact range #2 to 350 kcmil for 2/0 Copper flexible groundingcable, ASTM F855, Type 1, Gr

44、ade 3, Class A, Design C, Style 7.NOTE 3It is expected that manufacturers will publish catalog data conforming to this specification that will combine the requirements of 7.1.1 7.1.8in a single product number. With that system, a typical order description is: 100 (Smith Manufacturing Co. Product No.

45、 XXXX) grounding clampsASTMF855, Grade 2 or 2H.8. Materials8.1 Current carrying parts made of copper base or aluminum base alloy shall have the following material properties inaccordance with Test Methods E8/E8M:F855 149Copper Base Alloy Aluminum Base AlloyTensile strength, min 207 MPa (30 000 psi)

46、207 MPa (30 000 psi)Yield strength, min 90 MPa (13 000 psi) 138 MPa (20 000 psi)Elongation, min 6 % 3 %8.2 Type II clamps shall be equipped with an insulating handle (hot stick) appropriate for the nominal voltage of the circuit tobe grounded.9. Electrical and Mechanical Properties9.1 Electrical and

47、 mechanical properties shall conform to the requirements prescribed in Table 1 or Table 2, as appropriate, andthe following paragraphs. See Appendix X3 for a discussion and derivation of the current levels in Table 1. See Appendix X4 fora discussion of the effects of asymmetrical current and the der

48、ivation of the currents in Table 2.9.1.1 Types I and II stick installed clamps shall be designed such that a failure does not increase the risk of injury to the useror have excess mechanical strength to prevent failure, defined as follows:9.1.1.1 In the event the clamp is over-torqued during install

49、ation, normal fracture shall be such that the attached cable remainsunder control by being retained with the stick.9.1.1.2 Clamps with an ultimate torque strength exceeding 45 Nm (400 lbfin.) are exempt from the provisions of 9.1.1.1.9.1.2 Resistance from the main contact to the attached cable contact shall be less than that for an equal length of maximum sizecable(s) for which the clamp is rated.9.1.3 Main contacts shall accept and clamp all conductors or structural members in accordance with the manufacturers rating.9.1.4 C