ASTM F712-2006 Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers《工人防护用电绝缘塑料防护设备的标准试验方法和规范》.pdf

《ASTM F712-2006 Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers《工人防护用电绝缘塑料防护设备的标准试验方法和规范》.pdf》由会员分享，可在线阅读，更多相关《ASTM F712-2006 Standard Test Methods and Specifications for Electrically Insulating Plastic Guard Equipment for Protection of Workers《工人防护用电绝缘塑料防护设备的标准试验方法和规范》.pdf（5页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: F 712 06Standard Test Methods and Specifications forElectrically Insulating Plastic Guard Equipment forProtection of Workers1This standard is issued under the fixed designation F 712; the number immediately following the designation indicates the year oforiginal adoption or, in the case

2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover three electrical tests on plasticguards and assembled guard system

3、s. They are:1.1.1 Method AWithstand voltage proof test,1.1.2 Method BFlashover voltage, and1.1.3 Method CLeakage current.1.1.4 This specification covers plastic guard equipment andguard systems used by workers for temporary insulation onelectric power circuits.1.1.5 Plastic guard equipment covered b

4、y this specificationis rated for momentary, or brush contact only. Maximum-usevoltages are covered in Table 1 and Table 2.1.2 These test methods cover, but are not limited to, thefollowing typical guards:1.2.1 Conductor Guards and Connecting Covers as follows:1.2.1.1 Line guards,1.2.1.2 Line guard c

5、onnectors,1.2.1.3 Insulator covers,1.2.1.4 Dead-end covers,1.2.1.5 Bus guards, and1.2.1.6 Bus “T” guards.1.2.2 Structure and Apparatus Covers as follows:1.2.2.1 Pole guards,1.2.2.2 Ridge pin covers,1.2.2.3 Switch blade covers,1.2.2.4 Arm guards,1.2.2.5 Cutout covers,1.2.2.6 Structural barriers, and1

6、.2.2.7 Cross arm guard.1.3 It is common practice for the user of this equipment toprepare instructions for the correct use and maintenance.1.4 The use and maintenance of this equipment is beyondthe scope of these test methods.1.5 This standard does not purport to address all of thesafety concerns, i

7、f 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 regulatory limitations prior to use.1.6 The values stated in inch-pound units are to be regardedas the standard.2. Referenced

8、 Documents2.1 ASTM Standards:2D 149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD 570 Test Method for Water Absorption of Pl

9、astics2.2 IEEE Standard:3IEEE 978 Guide for In-Service Maintenance and ElectricalTesting for Live-Line Tools2.3 ANSI Standard:4C39.5 Safety Requirements for Electrical and ElectronicMeasuring and Controlling Instrumentation2.4 UL Standard:594 Tests for Flammability of Plastic Materials for Parts inD

10、evices and Appliances3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 insulating plastic guardsdevices for temporary in-stallation on structures or energized electric power circuits forelectrical protection of personnel or equipment, or both.3.1.2 self extinguishingrelates to a

11、 property of a plasticmaterial compounded so as to cease combustion on removal ofthe source that caused ignition.1These test methods are under the jurisdiction of ASTM Committee F18 onElectrical Protective Equipment for Workers and are the direct responsibility ofSubcommittee F18.25 on Insulating Co

12、ver-Up Equipment.Current edition approved Nov. 15, 2006. Published January 2007. Originallyapproved in 1981. Last previous edition approved in 2000 as F 712 88(2000).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual B

13、ook of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http:/www.ieee.org.4Available from American National Standar

14、ds Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org5Available from Underwriters Laboratories (UL), 333 Pfingsten Rd., North-brook, IL 60062-2096, http:/.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United State

15、s.4. Significance and Use4.1 All three tests may be used for product design qualifi-cation.4.2 This specification covers the minimum electrical,chemical, and physical properties designated by the manufac-turer and the detailed procedures by which such properties areto be determined. The purchaser ha

16、s the option to perform orhave performed any of these tests and may reject equipmentthat fails to meet the standard criteria. Claims concerningfailure to meet the specification are subject to verification bythe manufacturer.4.3 Plastic guard equipment is used for protection againstaccidental brush c

17、ontact by the worker.Amargin of safety shallbe provided between the maximum voltage at which they areused and the proof-test voltage at which they are tested. Thisrelationship is shown in Table 1 and Table 2. The equipment isdesigned only for phase-to-ground or covered phase-to-covered-phase exposur

18、e.NOTE 1Rubber insulating equipment is realistically limited to Class 4material in the design specification standards. Plastic guard equipment hasbeen designed to go beyond these voltages and provide a satisfactorydegree of worker protection. Major differences exist in use criteriabetween the rubber

19、 and the plastic guard equipment. Each glove, sleeve,or other article of rubber insulating equipment has a given safety factor forthe phase to phase voltage on which it may be used and the class or proofvoltage at which it is tested. Plastic guard equipment, however, is designedto provide a satisfac

20、tory safety factor only when used in a phase-to-groundexposure. If exposure is phase-to-phase, then a satisfactory safety factor isonly provided if the exposure is covered-phase-to-covered-phase.4.4 Work practices vary from user to user, dependent uponmany factors. These may include, but are not lim

21、ited to,operating system voltages, construction design, work proce-dure techniques, weather conditions, etc. Therefore, except forthe restrictions set forth in this specification because of designlimitations, the use and maintenance of this equipment isbeyond the scope of this specification.4.5 It i

22、s common practice and the responsibility of the userof this type of protective equipment to prepare completeinstructions and regulations to govern in detail the correct andsafe use of such equipment.5. Apparatus5.1 Voltage Source and Test TechniquesSee Test MethodD 149. The test equipment shall have

23、 adequate power andprovide relatively stepless variable test voltage that can beraised at a rate of approximately 1000 V/s ac or 3000 V/s dc.5.2 Energized Inner Electrodes, in accordance with Table 3and Table 4. The length should be sufficient to extend past theends of the guard or guard assemblies

24、where appropriate.5.3 Outer Ground ElectrodeA conductive material withsize and location as indicated in Table 3.5.4 Shielded CableTo reduce the “room influence” whenconducting ac leakage tests, the cable from the pickup elec-trode to the current-measuring device should be a shieldedcable with the ca

25、ble shield grounded.6. Sampling6.1 Design tests of each product model shall be conductedto verify that the requirements of Table 1 and Table 2 are met.6.2 Design TestsSamples shall consist of sufficient speci-mens of each product used in a specific guard system to formone of each assembly intended f

26、or field use.6.2.1 The design tests will be used to qualify a specificproduct model and normally will not be repeated duringproduction.6.2.2 Acceptance Tests A test sample shall consist of oneor more specimens dependent on the percentage of the lotbeing tested.6.2.3 A lot is represented either by al

27、l the guards producedin one production run or in one shipment.6.2.4 Lots of new or unused guards shall have test speci-mens selected at random.7. Classification7.1 Guards are furnished in three types of materials speci-fied in Section 9 and explained as follows:7.1.1 Type I guards are constructed of

28、 plastic materialhaving mechanical impact properties suitable for cold weatherservice.7.1.2 Type II guards have self-extinguishing plastic con-struction.7.1.3 Type III guards are constructed of self-extinguishingplastic material having mechanical impact properties suitablefor cold weather service.7.

29、2 Guards are furnished in three grades in accordance withprovisions for installation as follows:7.2.1 Grade 1 guards have hot stick handles attached forinstallation.TABLE 1 Withstand Voltage Proof TestAClass Rating,kVMax Use60 HzProof Test Withstand Voltage(in-service testing)Criteria0-0A0-Ground 0-

30、Ground kVDuration,min60 Hz DC2 14.6 8.4 13.0 18 1 No flashoverother thanmomentaryas a result oftoo-closespacing ofelectrode3 26.4 15.3 24.0 34 14 36.6 21.1 32.0 45 15 48.3 27.0 42.0 60 0.56 72.5 41.8 64.0 91 0.25ACover-up materials are tested at values greater than the maximum use phaseto ground val

31、ues. The maximum use phase to phase values relate to guardedphase to guarded phase. The units are not rated for bare phase to guarded phasepotentials.TABLE 2 Minimum Flashover TestARating,kVMax Use60 HzMin Flashover VoltageTest f-Ground kVCriteria0-0A0-Ground 60 Hz DC2 14.6 8.4 14.0 20 No flashovero

32、ther thanmomentaryas a result oftoo-closespacing ofelectrode3 26.4 15.3 25.0 354 36.6 21.1 34.0 485 48.3 27.0 43.0 616 72.5 41.8 67.0 95ACover-up materials are tested at values greater than the maximum use phaseto ground values. The maximum use phase to phase values relate to guardedphase to guarded

33、 phase. The units are not rated for bare phase to guarded phasepotentials.F7120627.2.2 Grade 2 guards are equipped with eyes for installationwith removable hot sticks.7.2.3 Grade 3 guards are intended for applications where theusual installation is by hand. These guards are equipped withrope loops,

34、or their equivalent, so their removal may beaccomplished with hot sticks.7.2.3.1 ExamplePole guards installed on a pole prior toraising it close to overhead line conductors. After the pole israised the guard is opened with hot sticks and allowed to slidedown the pole where it can be safely removed b

35、y hand.7.3 Guards are made in five classes in accordance with thevoltage ratings in Annex A1.8. Ordering Information8.1 Orders for guards under this specification shall includethe designation ASTM Specification F 712 and should includethe following information.8.1.1 Quantity,8.1.2 Name-description o

36、f guard or cover,8.1.3 Type, see 7.1.1 through 7.1.3,8.1.4 Grade, see 7.2.1 through7.2.3,8.1.5 Class, see Table 1, Table 2,orTable 4,8.1.6 Size, if applicable, see Section 11.NOTE 2Atypical ordering description is as follows: 100 Line Guards,ASTM Specification F 712, Type I, Grade 1, Class 3A, 4.5-f

37、t long.NOTE 3It is expected that manufacturers will publish catalog dataconforming to this specification that will combine the requirements of8.1.2 and 8.1.6 in a single product number. With that system, a typicalorder description is: 100 (Smith Manufacturing Co., Product No. XXXX)Line Guards, ASTM

38、Specification F 712.9. Materials9.1 Principal construction of insulating body shells shall bein accordance with the material requirements as follows:9.1.1 Type I GuardsMinimum 1.5 ftlbf/in. (80.06 J/m ofnotch) notched izod impact strength at 20F(29C); maxi-mum water absorption 0.1 % by weight; minim

39、um 380 V/mL(0.025 mm) dielectric strength.9.1.2 Type II GuardsMinimum 1.0 ftlbf/in. (53.4 J/m)notched izod impact strength at 20F (29C); maximumwater absorption 0.5 % by weight; minimum 320 V/mL (0.025mm) dielectric strength; 94 V-O flame retardancy.9.1.3 Type III GuardsMinimum 3.0 ftlbf/in. (160.1

40、J/mof notch) notched izod impact strength at 20F(29C);maximum water absorption 0.09 % by weight; minimum 300V/mL(0.025 mm) dielectric strength; 94 V-O flame retardancy.9.1.4 Material ratings for Notched Izod Impact Strengthshall be in accordance with Test Methods D 256, Method A.9.1.5 Material ratin

41、gs for water absorption shall be inaccordance with Test Method D 570.9.1.6 Material ratings for dielectric strength shall be inaccordance with Test Method D 149.9.1.7 Material ratings for flame retardancy shall be inaccordance with UL Standard 94.9.2 Handles of Grade 1 Guards shall be reinforced pla

42、sticand shall be capable of withstanding 100 kV at 60 Hz for each1 ft (300 mm) of length for 5 min without heating or tracking.(See 5.6.2 of IEEE 978.)9.3 Ropes and cords shall be nonconductive.TABLE 3 Typical Electrodes for Testing Plastic Guard EquipmentType of Guards Energized Inner Electrode for

43、 All TestsAOuter Ground ElectrodeAProof Test Flashover and Leakage TestsLine guards and line guard Round metal tube or bar. Complete electodeBshall be 4 by 6-in. flexible conductive padconnectors spaced back from openings placed alternately on all exteriorInsulator covers and deadened Maximum conduc

44、tor, hardware and insulator assembly for through which the energized surfaces and across conductorcovers which rated or similar mock-up including mandrelCof electrode protrudes during the opening of guard and assembledconductive material approximate.Dtest only as necessary to avoid guard system join

45、ts spaced backPole guards, ridge pin andERound metal tube, fabricated mandrelCflashover. Therefore, the entire from openings through which theswitch blade covers or cluster small metal tubes.Darea of each cover shall be tested energized electrode protrudesas nearly as practical. during the test only

46、 as necessaryArm guards Round or rectangular metal tube or fabricated mandrel.DCto avoid flashover at outer ends.Cutout covers Largest cutout with bare leads covered with equal ratedline hose. Or similar mock-up including mandrelCofconductive material.DStructural barrier Rectangular metal sheets app

47、roximately 3 mm (0.06 in.)thick, having smoothly rounded edges and corners,have been found to be satisfactory for this purpose.Also satisfactory are wet felt or sponge-top electodes.AMoistened electrodes may be secured with rubber straps or blanket pins. Pressure-sensitive tape is helpful in securin

48、g dry metal foil electrodes.BSuitable materials include: metal foil or screen; tap water-moistened sponge sheeting, or blanket made of wool, or similar material including synthetics.CThin metal sheet or screen wire secured on wood frames make suitable electrodes. Carved synthetic sponge moistened wi

49、th tap water is suitable for small forms.DThe dimensions of the mandrel are to approximate the maximum size of equipment to which the guard system is to be applied.EMetal canisters made for storing rubber blankets make suitable electrodes for pole guard tests.TABLE 4 Inner Electrode SizesClassARatingMax Use Inner Electrode Diameter, in. (mm)kV 60 HzMin Maxf ffGr.2 14.6 8.4 0.25 (6.4) 0.75 (19.1)3 26.4 15.3 0.25 (6.4) 0.75 (19.1)4 36.6 21.1 0.25 (6.4) 0.75 (19.1)5 48.3 27.0 0.50 (12.7) 1.50 (38.1)6 72.5 41.8 0.75 (19.1) 2.00 (50.8)ACover