1、Designation: F2321 05 (Reapproved 2013)Standard Specification forFlexible 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 revision, the year of la
2、st 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 testingof flexible insulated temporary bypass jumpers (bypass jump-ers) u
3、sed on energized power lines and equipment.1.2 It is common practice for the user of this protectiveequipment to prepare complete instructions and safety regula-tions to govern in detail the correct and safe use of suchequipment. Also see 4.2.1.3 The use and maintenance of this equipment are beyondt
4、he scope of these specifications.1.4 These specifications for a system of bypass jumpers iscovered in four parts as follows:Title SectionsClamps for Bypass Jumpers 517Ferrules for Bypass Jumpers 1831Cable for Bypass Jumpers 3240Bypass Jumpers (complete assemblywith clamps, ferrules, and cable)41551.
5、5 Each of the four parts is an entity of itself, but is listedas a part of the system for completeness and clarification.1.6 The values stated in SI units are to be regarded as thestandard. See ASTM IEEE/ASTM SI 10.1.7 The following precautionary caveat pertains only to thetest method portions, Sect
6、ions 13, 26, 48, and 55 of thesespecifications. This standard does not purport to address all ofthe safety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulat
7、ory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2B33 Specification for Tin-Coated Soft or Annealed CopperWire for Electrical PurposesB172 Specification for Rope-Lay-Stranded Copper Conduc-tors Having Bunch-Stranded Members, for Electrical Con-ductorsB173 Specification for Rop
8、e-Lay-Stranded Copper Conduc-tors Having Concentric-Stranded Members, for ElectricalConductorsD2768 Specification for General-Purpose Ethylene-Propylene Rubber Jacket for Wire and Cable (Withdrawn2007)3D2770 Specification for Ozone-Resisting Ethylene-Propylene Rubber Integral Insulation and Jacket f
9、or Wireand Cable (Withdrawn 2007)3D2802 Specification for Ozone-Resistant Ethylene-AlkenePolymer Insulation for Wire and CableD2865 Practice for Calibration of Standards and Equipmentfor Electrical Insulating Materials TestingE8 Test Methods for Tension Testing of Metallic MaterialsF819 Terminology
10、Relating to Electrical Protective Equip-ment for WorkersIEEE/ASTM SI 10 American National Standard for MetricPractice2.2 ANSI Standards:4ANSI C39.5 Safety Requirements for Electrical and Elec-tronic Measuring and Controlling InstrumentsANSI C84.1 Voltage Ratings for Electric Power Systems andEquipme
11、nt (60 Hz)ANSI C119.4 American National Standard for ElectricalConnectors2.3 NEMA Standard:5WC 8 Ethylene-Propylene-Rubber Insulated Wire and Cablefor the Transmission and Distribution of Electrical Energy(formerly ICEA S-68-516)3. Terminology3.1 Definitions:1This specification is under the jurisdic
12、tion of ASTM Committee F18 onElectrical Protective Equipment for Workers and is the direct responsibility ofSubcommittee F18.45 on Mechanical Apparatus.Current edition approved Oct. 1, 2013. Published October 2013. Originallyapproved in 2003. Last previous edition approved in 2005 as F232105. DOI:10
13、.1520/F2321-05R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historic
14、al standard is referenced onwww.astm.org.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.5Available from National Electrical Manufacturers Association (NEMA), 1300N. 17th St., Suite 1847, Rosslyn, VA 22209.Copyright ASTM International, 100 B
15、arr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.1 flexible insulated temporary bypass jumpersdevicesdesigned and used to keep electric supply circuits effectivelycontinuous (electrically bridged) for short periods of time atwork locations when conductors or equipme
16、nt may otherwisebe opened or made electrically discontinuous during workoperations.3.1.1.1 DiscussionThe devices are normally installed,used, and removed as part of a protective insulating systemcomposed of insulating covers and/or observances of requiredminimum safe approach distances for workers.3
17、.1.2 voltage, normal designa nominal value consistentwith the latest revision of ANSI C84.1, assigned to the circuitor system for the purpose of conveniently designating itsvoltage class.3.1.3 voltage, maximum usethe ac voltage (rms) classifi-cation of the protective equipment that designates the ma
18、xi-mum nominal design voltage of the energized system that maybe safely worked. The nominal design voltage is equal tophase-to-phase voltage on multiphase circuits.3.1.3.1 DiscussionIf there is no multiphase exposure in asystem area, and the voltage exposure is limited to phase(polarity on dc system
19、s) to ground potential, the phase (polarityon dc systems) to ground potential shall be considered to be thenominal design voltage.3.1.3.2 DiscussionIf electrical equipment and devices areinsulated or isolated, or both, such that the multiphase exposureon a grounded wye circuit is removed, then the n
20、ominal designvoltage may be considered as the phase-to-ground voltage onthat circuit.NOTE 1The work practices and methods associated with removingmultiphase exposures at any given work site are not addressed in thisspecification.3.2 For definitions of other terms, refer to TerminologyF819.4. Signifi
21、cance and Use4.1 These specifications cover the minimum electrical andphysical properties designated by the manufacturer and thedetailed procedures by which such properties are to be deter-mined. The purchaser may at his option perform or haveperformed any of these tests in order to verify the manuf
22、actur-ers designation. Claims for failure to meet the specification aresubject to verification by the manufacturer.4.2 Bypass jumpers are devices designed and used to keepelectrical circuits effectively continuous (electrically bridged)for short periods of time at work locations when conductors oreq
23、uipment may otherwise be opened or made discontinuousduring work operations. Bypass jumpers are insulated totemporarily protect personnel from brush or accidental contactonly; therefore, when authorizing their use, a margin of safetyshould be provided between the maximum voltage used on,and the proo
24、f-test voltage at which they are tested. Therelationship between proof-test voltage and the maximumvoltage at which bypass jumpers are used is shown in Table 1.WarningPortions of these devices (clamps and ferrules) arenot insulated and offer no protection from accidental contact.CLAMPS FOR BYPASS JU
25、MPERS5. Scope5.1 This specification covers clamps used in the assembly ofbypass jumpers.6. Classification6.1 Clamps are furnished in, but not limited to, two stylesaccording to their function and method of installation.6.1.1 Style IClamps equipped with insulated handles forinstallation on energized
26、conductors with rubber gloves. SeeFig. 1.6.1.1.1 Insulated handles may be either clear or opaque.6.1.1.2 Insulating materials used in this specification in-clude thermo-set plastic, elastomers, elastomer compounds,thermoplastic polymers or any combination, regardless oforigin.6.1.2 Style IIClamps eq
27、uipped with provisions for instal-lation on energized conductors with live line tools. See Figs.2-4.6.1.2.1 Clamps are furnished according to mechanicalstrength and current rating. See Table 2.6.2 Clamps are furnished in two classes according to thecharacteristics of the main contact jaws.6.2.1 Clas
28、s AClamp jaws with smooth contact surfaces.6.2.2 Class BClamp jaws with serrations, crosshatchingor other means intended to abrade or bite through corrosionproducts on the surface of the conductor being clamped.TABLE 1 Proof Test/Use Voltage RelationshipVoltageRatingMaximumUse Voltage(rms) VAC Proof
29、Test Voltage(rms) VDC ProofTest Voltage(avg) V15 kV 15 000 20 000 50 00025 kV 25 000 30 000 60 00035 kV 35 000 40 000 70 000FIG. 1 Style I ClampF2321 05 (2013)27. Sizes7.1 Clamp size is the combination of the main contact andcable size ranges as listed by the manufacturers.8. Ordering Information8.1
30、 Orders for clamps under this specification shall includethis ASTM designation and the following information:8.1.1 Quantity,8.1.2 Name (Bypass Jumper Clamp),8.1.3 Main contact size ranges, conductor descriptions, andtype of materials which are to be clamped,8.1.4 Cable size, material, and descriptio
31、n by which clampsare to be assembled,8.1.5 Style (see 6.1),8.1.6 Class (see 6.2), and8.1.7 Clamps for bypass jumpers, at the customers request,shall meet ANSI C119.4.9. Materials9.1 Current carrying parts of copper base or aluminum basealloy shall meet the material properties shown in Table 3 and in
32、accordance with Test Methods E8.10. Electrical and Mechanical Properties10.1 Materials used shall meet the requirements of 9.1.10.2 Electrical and mechanical properties shall conform tothe requirements prescribed in Tables 1-3 and with the follow-ing:NOTE 2Style II clamps are uninsulated and do not
33、require confor-mance with the electrical requirements of Table 1.10.2.1 Clamps shall accept hand assembly of all cablesfitted with compatible ferrules as rated per Table 2.10.2.2 Main contacts shall accept and clamp all conductorsaccording to the manufacturers recommendation.10.2.3 Style II clamps s
34、hall have the following properties:10.2.3.1 In the event the clamp is over-torqued duringinstallation, normal fracture shall be such that the attachedcable remains under control by being retained with the live lineFIG. 2 Style II “C” Shape ClampFIG. 3 Style II “C” Shape ClampFIG. 4 Style II Duck Bil
35、l Shape ClampTABLE 2 Clamp Torque Strength, minStyle II ClampsCableSizeContinuousCurrentYieldAUltimate(AWG) A, rms, 60 Hz N-m (lbf in.) N-m (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)AYield shall mean no permanent deformation such
36、that the clamp cannot bereused throughout its entire range of application.TABLE 3 Material PropertiesCopper Base Alloy Aluminum Base AlloyTensile 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 05 (2013
37、)3tool. Clamps with an ultimate torque strength exceeding 45N-m (400 lbf in.) are exempt from this provision.10.2.3.2 Cable termination shall include a cable support orshall be made to accept a cable supporting ferrule compatiblewith the clamp. This support shall secure the entire cable overthe jack
38、et and is provided in addition to the electrical connec-tion to the strand.10.2.3.3 Clamps shall be compatible with clamp sticks andshall fit securely inside the 13 mm (12-in.) wide slot in the headof the stick.10.2.4 Main contacts shall accept and clamp all conductorsor structural members in accord
39、ance with the manufacturersrating.11. Workmanship, Finish, and Appearance11.1 Components shall be free of structural porosity, fins,sharp edges, splits, cracks and other defects that affect handlingor performance.11.2 All parts shall be formed, machined, and assembledwith sufficient accuracy for smo
40、oth operation by hand, andshall be free of excessive looseness to the extent detrimental torepeated applications at the recommended installing torque.11.3 ClassA(smooth jaw) clamps shall have smooth contactsurfaces free of burrs, fins, or other protuberances that wouldimpair performance.11.4 Class B
41、 (serrated jaw) clamps shall have longitudinallylevel surface, that, with clamp movement as specified by themanufacturer, will provide a cleaning effect on the surface ofthe conductor.11.5 Slag grinding marks, depressions, and other surfaceirregularities that do not affect strength, performance, orh
42、andling are not cause for rejection.12. Sampling12.1 A product model represents a manufacturers designspecification standard according to which the production lot ismanufactured.12.2 A production lot shall consist of all clamps of oneproduction model produced at one time.12.3 A test sample shall con
43、sist of two specimens for eachdifferent test specified. Specimens are selected at random andshall pass the inspection requirements of Section 14. When afailure occurs in one specimen from the first sample, a secondsample from the same lot shall be selected and tested. If thesecond sample (two specim
44、ens) passes, the lot shall be ac-cepted. If one specimen from the second sample fails, the lotshall be rejected.13. Design Tests13.1 The design tests that follow shall be made on testsamples of each product model to verify that the requirementsof this specification are met.13.2 Mechanical Torque Str
45、ength :13.2.1 Install the clamp on the main conductor of theminimum and maximum size for which the clamp is rated andapply torsion force to the main screw. Force may be applied toother devices designed to secure the clamp on the conductor.13.2.2 Measure torque by a torque wrench that indicatestorque
46、 directly or by other manner easily convertible.13.2.3 The main conductor is defined as the material(s) onwhich the clamp is rated to be used.13.2.4 Yield and ultimate strength shall equal or exceed thevalues shown in Table 2.13.3 Continuous Current Rating:13.3.1 Test the clamp at the continuous cur
47、rent level forwhich it is rated. The temperature shall be measured at thewarmest spot on clamp and on the metal strand at the midpointof an attached cable, which is a minimum of 1.5 m (5 ft.) inlength. The maximum temperature of the clamp shall be lowerthan the midpoint temperature of the maximum si
48、ze coppermain or tap cable for which the clamp is rated.14. Inspection and Product Testing14.1 The clamps shall be inspected and tested as follows:14.1.1 Verification of the main contact and cable capacitiesare in accordance with 10.2.2 and 10.2.3.14.1.2 Visual inspection and hand operation shall be
49、 done toverify workmanship, finish, and appearance, which shall be inaccordance with Section 11.14.1.3 Torque test on a test sample shall be in accordancewith 13.2.15. Acceptance, Rejection and Rehearing15.1 At the option of the purchaser, a production lot may besubjected to the following:15.1.1 Inspection in accordance with 14.1 for operation,main contact range, workmanship, and appearance. Individualclamps that do not conform may be rejected.15.2 Material that fails to conform to the requirements ofthis specification may be rejected. Rejection should be re
