1、Designation: F2321 05 (Reapproved 2013)F2321 14Standard Specification forFlexible and Rigid Insulated Temporary By-Pass Jumpers1This standard is issued under the fixed designation F2321; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These specifications cover the manufacture and testing of flexible insulated temporary bypassBy-Pass j
3、umpers (bypass(By-Pass jumpers) used on energized power lines and equipment.1.2 It is common practice for the user of this protective equipment to prepare complete instructions and safety regulations togovern in detail the correct and safe use of such equipment. Also see 4.2.1.3 The use and maintena
4、nce of this equipment are beyond the scope of these specifications.1.4 These specifications for a system of bypassBy-Pass jumpers is covered in four parts as follows:Title SectionsClamps for Bypass Jumpers 5 17Clamps for By-Pass Jumpers 5 17Ferrules for Bypass Jumpers 18 31Ferrules for By-Pass Jumpe
5、rs 18 31Cable for Bypass Jumpers 32 40Cable for By-Pass Jumpers 32 40Bypass Jumpers (complete assemblywith clamps, ferrules, and cable)41 55By-Pass Jumpers (complete assemblywith clamps, ferrules, and cable)41 551.5 Each of the four parts is an entity of itself, but is listed as a part of the system
6、 for completeness and clarification.1.6 The values stated in SI units are to be regarded as the standard. See ASTM IEEE/ASTM SI 10.1.7 The following precautionary caveat pertains only to the test method portions, Sections 13, 26, 48, and 55 of thesespecifications. This standard does not purport to a
7、ddress all of the safety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability ofregulatory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2B33 Specific
8、ation for Tin-Coated Soft or Annealed Copper Wire for Electrical PurposesB172 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 Co
9、nduc-torsD2768 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)3D2802 Specification for Ozone-Resistant Ethylene-A
10、lkene Polymer Insulation for Wire and CableD2865 Practice for Calibration of Standards and Equipment for Electrical Insulating Materials TestingE8 Test Methods for Tension Testing of Metallic MaterialsF819 Terminology Relating to Electrical Protective Equipment for Workers1 This specification is und
11、er the jurisdiction of ASTM Committee F18 on Electrical Protective Equipment for Workers and is the direct responsibility of SubcommitteeF18.45 on Mechanical Apparatus.Current edition approved Oct. 1, 2013Aug. 15, 2014. Published October 2013October 2014. Originally approved in 2003. Last previous e
12、dition approved in 20052013as F2321F232105(2013).05. DOI: 10.1520/F2321-05R13.10.1520/F2321-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. ForAnnual Book ofASTM Standardsvolume information, refer to the standards Document S
13、ummary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.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
14、 not be technically possible to adequately depict all changes accurately, ASTM recommends that 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 Harbo
15、r Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1IEEE/ASTM SI 10 American National Standard for Metric Practice2.2 ANSI Standards:4ANSI C39.5 Safety Requirements for Electrical and Electronic Measuring and Controlling InstrumentsANSI C84.1 Voltage Ratings for Electric Power Syst
16、ems and Equipment (60 Hz)ANSI C119.4 American National Standard for Electrical Connectors2.3 NEMA Standard:5WC 8 Ethylene-Propylene-Rubber Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy(formerly ICEA S-68-516)3. Terminology3.1 Definitions:3.1.1 flexible and rigid
17、 insulated temporary bypassBy-Pass jumpersdevices designed and used to keep electric supply circuitseffectively continuous (electrically bridged) for short periods of time at work locations when conductors or equipment mayotherwise be opened or made electrically discontinuous during work operations.
18、3.1.1.1 DiscussionThe devices are normally installed, used, and removed as part of a protective insulating system composed of insulating coversand/or observances of required minimum safe approach distances for workers.3.1.2 voltage, normal designa nominal value consistent with the latest revision of
19、 ANSI C84.1, assigned to the circuit orsystem for the purpose of conveniently designating its voltage class.3.1.3 voltage, maximum usethe ac voltage (rms) classification of the protective equipment that designates the maximumnominal design voltage of the energized system that may be safely worked. T
20、he nominal design voltage is equal to phase-to-phasevoltage on multiphase circuits.3.1.3.1 DiscussionIf there is no multiphase exposure in a system area, and the voltage exposure is limited to phase (polarity on dc systems) to groundpotential, the phase (polarity on dc systems) to ground potential s
21、hall be considered to be the nominal design voltage.3.1.3.2 DiscussionIf electrical equipment and devices are insulated or isolated, or both, such that the multiphase exposure on a grounded wye circuitis removed, then the nominal design voltage may be considered as the phase-to-ground voltage on tha
22、t circuit.NOTE 1The work practices and methods associated with removing multiphase exposures at any given work site are not addressed in this specification.3.2 For definitions of other terms, refer to Terminology F819.4. Significance and Use4.1 These specifications cover the minimum electrical and p
23、hysical properties designated by the manufacturer and the detailedprocedures by which such properties are to be determined. The purchaser may at his option perform or have performed any of thesetests in order to verify the manufacturers designation. Claims for failure to meet the specification are s
24、ubject to verification bythe manufacturer.4.2 BypassBy-Pass jumpers are devices designed and used to keep electrical circuits effectively continuous (electricallybridged) for short periods of time at work locations when conductors or equipment may otherwise be opened or madediscontinuous during work
25、 operations. BypassBy-Pass jumpers are insulated to temporarily protect personnel from brush oraccidental contact only; therefore, when authorizing their use, a margin of safety should be provided between the maximum voltageused on, and the proof-test voltage at which they are tested. The relationsh
26、ip between proof-test voltage and the maximum voltageat which bypassBy-Pass jumpers are used is shown in Table 1. WarningPortions of these devices (clamps and ferrules) are notinsulated and offer no protection from accidental contact.CLAMPS FOR BYPASSBY-PASS JUMPERS5. Scope5.1 This specification cov
27、ers clamps used in the assembly of bypassBy-Pass jumpers.4 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.5 Available from National Electrical Manufacturers Association (NEMA), 1300 N. 17th St., Suite 1847, Rosslyn, VA 22209.F2321 1426. Cla
28、ssification6.1 Clamps are furnished in, but not limited to, two styles according to their function and method of installation.6.1.1 Style IClamps equipped with insulated handles for installation on energized conductors with rubber gloves. See Fig. 1.6.1.1.1 Insulated handles may be either clear or o
29、paque.6.1.1.2 Insulating materials used in this specification include thermo-set plastic, elastomers, elastomer compounds, thermo-plastic polymers or any combination, regardless of origin.6.1.2 Style IIClamps equipped with provisions for installation on energized conductors with live line tools. See
30、 Figs. 2-4Fig.2 and Fig. 3.6.1.2.1 Clamps are furnished according to mechanical strength and current rating. See Table 2.6.2 Clamps are furnished in two classes according to the characteristics of the main contact jaws.6.2.1 Class AClamp jaws with smooth contact surfaces.6.2.2 Class BClamp jaws with
31、 serrations, crosshatching or other means intended to abrade or bite through corrosion productson the surface of the conductor being clamped.7. Sizes7.1 Clamp size is the combination of the main contact and cable size ranges as listed by the manufacturers.8. Ordering Information8.1 Orders for clamps
32、 under this specification shall include this ASTM designation and the following information:8.1.1 Quantity,8.1.2 Name (Bypass(By-Pass Jumper Clamp),8.1.3 Main contact size ranges, conductor descriptions, and type of materials which are to be clamped,8.1.4 Cable size, material, and description by whi
33、ch clamps are to be assembled,8.1.5 Style (see 6.1),8.1.6 Class (see 6.2), and8.1.7 Clamps for bypassBy-Pass jumpers, at the customers request, shall meet ANSI C119.4.TABLE 1 Proof Test/Use Voltage RelationshipVoltageRatingMaximumUse Voltage(rms) VAC ProofTest Voltage(rms) VDC ProofTest Voltage(avg)
34、 V15 kV 15 000 20 000 50 00025 kV 25 000 30 000 60 00035 kV 35 000 40 000 70 00069 kV 69 000 74 000FIG. 1 Style I ClampF2321 1439. Materials9.1 Current carrying parts of copper base or aluminum base alloy shall meet the material properties shown in Table 3 and inaccordance with Test Methods E8.FIG.
35、2 Style II “C” Shape ClampFIG. 3 Style II “C” Duck Bill Shape ClampFIG. 4 Style II Duck Bill Shape ClampType III Plain Stud-Shrouded Compression FerruleF2321 14410. Electrical and Mechanical Properties10.1 Materials used shall meet the requirements of 9.1.10.2 Electrical and mechanical properties sh
36、all conform to the requirements prescribed in Tables 1-3 and with the following:NOTE 2Style II clamps are uninsulated and do not require conformance with the electrical requirements of Table 1.10.2.1 Clamps shall accept hand assembly of all cables fitted with compatible ferrules as rated per Table 2
37、.10.2.2 Main contacts shall accept and clamp all conductors according to the manufacturers recommendation.10.2.3 Style II clamps shall have the following properties:10.2.3.1 In the event the clamp is over-torqued during installation, normal fracture shall be such that the attached cable remainsunder
38、 control by being retained with the live line tool. Clamps with an ultimate torque strength exceeding 45 N-m (400 lbf in.)are exempt from this provision.10.2.3.2 Cable termination shall include a cable support or shall be made to accept a cable supporting ferrule compatible withthe clamp. This suppo
39、rt shall secure the entire cable over the jacket and is provided in addition to the electrical connection to thestrand.10.2.3.3 Clamps shall be compatible with clamp sticks and shall fit securely inside the 13 mm (12-in.) wide slot in the head ofthe stick.10.2.4 Main contacts shall accept and clamp
40、all conductors or structural members in accordance with the manufacturers rating.11. Workmanship, Finish, and Appearance11.1 Components shall be free of structural porosity, fins, sharp edges, splits, cracks and other defects that affect handling orperformance.11.2 All parts shall be formed, machine
41、d, and assembled with sufficient accuracy for smooth operation by hand, and shall befree of excessive looseness to the extent detrimental to repeated applications at the recommended installing torque.11.3 Class A (smooth jaw) clamps shall have smooth contact surfaces free of burrs, fins, or other pr
42、otuberances that wouldimpair performance.11.4 Class B (serrated jaw) clamps shall have longitudinally level surface, that, with clamp movement as specified by themanufacturer, will provide a cleaning effect on the surface of the conductor.11.5 Slag grinding marks, depressions, and other surface irre
43、gularities that do not affect strength, performance, or handling arenot cause for rejection.12. Sampling12.1 A product model represents a manufacturers design specification standard according to which the production lot ismanufactured.12.2 A production lot shall consist of all clamps of one producti
44、on model produced at one time.12.3 A test sample shall consist of two specimens for each different test specified. Specimens are selected at random and shallpass the inspection requirements of Section 14. When a failure occurs in one specimen from the first sample, a second sample fromthe same lot s
45、hall be selected and tested. If the second sample (two specimens) passes, the lot shall be accepted. If one specimenfrom the second sample fails, the lot shall be rejected.TABLE 2 Clamp Torque Strength, minStyle II ClampsCableSizeContinuousCurrent YieldA Ultimate(AWG) A, rms, 60 Hz N-m (lbf in.) N-m
46、 (lbf in.)#2 200A 32 (280) 37 (330)1/0 250A 32 (280) 37 (330)2/0 300A 32 (280) 37 (330)4/0 400A 37 (330) 45 (400)A Yield shall mean no permanent deformation such that the clamp cannot bereused throughout its entire range of application.TABLE 3 Material PropertiesCopper Base Alloy Aluminum Base Alloy
47、Tensile Strength, min. 207 Mpa (30 000 psi) 207 Mpa (30 000 psi)Yield Strength, min. 90 Mpa (13 000 psi) 138 Mpa (20 000 psi)Elongation, min 6 % 3 %F2321 14513. Design Tests13.1 The design tests that follow shall be made on test samples of each product model to verify that the requirements of thissp
48、ecification are met.13.2 Mechanical Torque Strength :13.2.1 Install the clamp on the main conductor of the minimum and maximum size for which the clamp is rated and applytorsion force to the main screw. Force may be applied to other devices designed to secure the clamp on the conductor.13.2.2 Measur
49、e torque by a torque wrench that indicates torque directly or by other manner easily convertible.13.2.3 The main conductor is defined as the material(s) on which the clamp is rated to be used.13.2.4 Yield and ultimate strength shall equal or exceed the values shown in Table 2.13.3 Continuous Current Rating:13.3.1 Test the clamp at the continuous current level for which it is rated. The temperature shall be measured at the warmestspot on clamp and on the metal strand at the midpoint of an attached cable, which is a minimum of 1.5 m (5 ft.)
