1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 8020:2011Tools for live working Specification for insulatinghand tools for work on ornear conductor rail systemsoperating at voltages up to1 000 V a.c. or 1 500 V d.c.Publishi
2、ng and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. BSI 2011ISBN 978 0 580 71084 1ICS 13.260; 45.120The following BSI references relate to the work on this standard:Committee reference PEL/78Draft for comment 10/30218908 DCPubli
3、cation historyFirst published January 2002Second (present) edition September 2011Amendments issued since publicationDate Text affectedBS 8020:2011 BRITISH STANDARDContentsForeword ii0 Introduction 11 Scope 12 Normative references 13 Terms and definitions 24 Materials 35 Construction 46 Properties 47
4、 Marking and instructions for use 58 Type tests for hand tools 69 Production conformity evaluation 8AnnexesAnnex A (normative) Tool categories 10Annex B (informative) Recommendations concerning use and in-service care 12Annex C (normative) Type tests 12Annex D (normative) Method of test for flammabi
5、lity 19Annex E (normative) Sampling 19Bibliography 23List of figuresFigure 1 Example of a hybrid insulating hand tool 2Figure 2 Marking symbol 5Figure C.1 Example test arrangement for handle grip sleeve adhesion test 13Figure C.2 Example test arrangement for handle pull-apart test 14Figure C.3 Examp
6、le test arrangement for handle material bend test 15Figure C.4 Example test arrangement for handle torsion test 16Figure C.5 Example test arrangement for the insulation bond test 17Figure C.6 Example test arrangement for insulation wear test 18Figure C.7 Example test arrangement for dry electrical t
7、est 18Figure C.8 Example test arrangement for wet electrical test 20Figure D.1 Example test arrangement for flammability test 21List of tablesTable C.1 Applied force for handle pull-apart test for category 1 insulatinghand tools 14Table E.1 Classification of defects 21Summary of pagesThis document c
8、omprises a front cover, an inside front cover, pages i to iv,pages 1 to 24, an inside back cover and a back cover.BRITISH STANDARD BS 8020:2011 BSI 2011 iForewordPublishing informationThis British Standard is published by BSI to come into effect on 1 January 2012.It was prepared by Technical Committ
9、ee PEL/78, Tools for live working. A list oforganizations represented on this committee can be obtained on request to itssecretary.SupersessionThis British Standard supersedes BS 8020:2002, which is to be withdrawn on31 December 2011.Relationship with other publicationsWhile BS EN 60900 provides a s
10、pecification for hand-held insulated andinsulating tools for live working, these are tools primarily used by electriciansand other electrical personnel. That standard does not provide an appropriatespecification for the larger, purpose-designed, specialist tools employed in trackwork. However, full
11、account has been taken of the requirements of BS EN 60900in drafting this standard to ensure uniformity of approach and commonrequirements where practicable.Information about this documentThis is a full revision of the standard and introduces the following principalchanges:a) additional requirements
12、 concerning the design and construction of hybridtools are included, i.e. tools that include both insulating and insulated parts;b) an additional mechanical test for verifying the insulation bond of hybridtools is included;c) an additional mechanical test for verifying the insulation wear of hybridt
13、ools and all other tools incorporating an insulating sleeve is included;d) a type and sampling wet electrical test for verifying the electrical insulationof finished hybrid tools is included in addition to the routine dry electricaltest;e) the determination of sample sizes in Annex E has been simpli
14、fied to reflectthe fact that many tools are manufactured in small batch sizes.Assessed capability. Users of this British Standard are advised to consider thedesirability of quality system assessment and registration against the appropriatestandard in the BS EN ISO 9000 series by an accredited third-
15、party certificationbody, with particular reference to material and chemical bonding used in themanufacture of insulating hand tools.Use of this documentIt has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrusted to appropriately qualified and
16、experienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative mate
17、rial is presented insmaller italic type, and does not constitute a normative element.BRITISH STANDARDBS 8020:2011ii BSI 2011Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Co
18、mpliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 8020:2011 BSI 2011 iiiBRITISH STANDARDBS 8020:2011This page deliberately left blankiv BSI 20110 IntroductionThis British Standard specifies requirements for insulating hand tools and hybridinsulating ha
19、nd tools, where the applied insulation for the latter is acombination of the measures used separately for insulated and insulating tools.This British Standard does not provide a specification according to the definitionof an insulated tool because the size, design and construction of specialist trac
20、ktools makes this method of insulation application alone impracticable.The tools specified in this British Standard are for work on or in close proximityto ground-level, fully exposed live conductor rails providing traction supplies forelectrified railways. Such traction supply systems are in wide u
21、se in certain areasof Great Britain, particularly in London and southern England. These tractionsystems date from the early days of railway electrification and their design andconstruction impose special requirements concerning tools used for track work,in order to meet modern safety requirements. T
22、hese specialist tools are intendedto protect the user from electric shock and minimize the risk of causingshort-circuits by bridging between two conductive parts at different potentials.NOTE BS EN 50163 specifies requirements for the supply voltages of tractionsystems.1 ScopeThis British Standard sp
23、ecifies requirements for insulating hand tools and hybridinsulating hand tools used for work on or in close proximity to conductor railsproviding traction supplies, in accordance with BS EN 50163, to electrifiedrailways and mass transit systems operating at voltages up to 1 000 V a.c. or1 500 V d.c.
24、It is not applicable to hand-held insulated and insulating tools conventionallyused by electricians and others for work on live electrical apparatus, which arespecified in BS EN 60900.2 Normative referencesThe following referenced documents are indispensable for the application ofthis document. For
25、dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS 876:1995, Specification for hand hammersBS 1421:1995, Specification for picks, beater picks and mattocksBS 2589:1955, Specification for railway
26、track spannersBS 2945:1995, Specification for axes and hatchetsBS 3388:2004, Forks, shovels and spades Requirements and test methodsBS EN 60900:2004, Live working Hand tools for use up to 1 000 V a.c. and1 500 V d.c.BS EN ISO 2039-2:2000 (BS 2782-3: Method 365C:1992), Plastics Determinationof hardne
27、ss Part 2: Rockwell hardnessIEC 60417-5216:2002 (DB:2002-10), Graphical symbols for safety-relatedapplications Suitable for live working: double triangle and voltage indicationBRITISH STANDARD BS 8020:2011 BSI 2011 13 Terms and definitionsFor the purposes of this British Standard, the following term
28、s and definitionsapply.3.1 acceptance testcontractual test that provides the customer with evidence that the item(s) orproduct in question meet(s) the conditions of the customers specification3.2 hybrid insulating hand toolhand tool employing a combination of insulated and insulating partsNOTE 1 An
29、example is shown in Figure 1.NOTE 2 Annex A categorizes tools according to their design, construction andintended use. Category 5(a) is applicable to hybrid insulating tools. The constructionand method of insulation might dictate that particular tools in other categories canalso be classified as hyb
30、rid insulating tools, e.g. torque wrenches.3.3 insulated hand toolhand tool made of conductive material(s), fully or partially covered by insulatingmaterial(s)IEC 60743, 2.3.13.4 insulating hand toolhand tool made totally or predominantly from insulated material(s)IEC 60743, 2.3.2NOTE 1 Insulating h
31、and tools have metal working heads and might have someconductive parts used for reinforcement, which might or might not be exposed.Without any insulating material the remainder would no longer constitute a tool.NOTE 2 Annex A categorizes tools according to their design, construction andintended use.
32、Figure 1 Example of a hybrid insulating hand toolKey1 Orange overguard 3 Insulating shaft2 White underguard 4 Metal socketNOTE 1 This figure is not to scale.NOTE 2 For clarity, all bonding between components, in accordance with 4.1, have been omitted.BRITISH STANDARDBS 8020:20112 BSI 20113.5 insulat
33、ing insertinsulating material inserted between two conductive parts, e.g. in the case of adouble-ended tool3.6 material batchpurchase lot or production run of each finished length, profile and size ofprofile of insulating material to be used in the manufacture of insulating handtools3.7 routine test
34、test to which each individual insulating hand tool is subjected during or aftermanufacture to ascertain whether it conforms to certain criteria3.8 sample testtest on a selected number of items taken at random from a batch3.9 tool batchproduction run of tools within a particular tool categoryNOTE Def
35、initions of tool categories are given in Annex A.3.10 tool working headpart of an insulating hand tool intended to perform the function of the tool,which might be in contact with or in close proximity to conductor rails3.11 type testtest of one or more insulating hand tools manufactured to a certain
36、 design toshow that the design meets certain specifications4 Materials4.1 GeneralThe insulating material(s) shall be compatible with one another and with anyother materials used in the construction of the insulating hand tool.NOTE Such compatibility ensures adequate bonding of the insulating materia
37、l(s),as well as no adverse chemical inter-reaction(s).When selecting and applying insulating materials, the materials shall be selectedand applied to prevent the absorption or ingress of moisture beneath suchmaterial(s).In the case of category 5 tools, the handle grip shall be formed from materialth
38、at has a comparable di-electric performance to the tool shaft.4.2 FibreglassWhen fibreglass insulating material is required as a structural component of thetool, fibreglass shall be used that contains a mass fraction of not less than 60%fibre, and fibres that are tensioned, continuous and parallel.T
39、he fibreglass specification shall be obtained from the fibreglass manufacturerand shall be made available to the tester and/or the purchaser if requested.4.3 AppearanceThe colour of the insulating parts shall be predominantly orange.In the case of hybrid tools, the outer layer (overguard) shall be o
40、range and theunder layer (underguard) shall be white.BRITISH STANDARD BS 8020:2011 BSI 2011 35 Construction5.1 GeneralAn insulating or hybrid insulating hand tool shall be manufactured from anassembly including one or more insulating parts in conjunction with theconductive tool working head.NOTE 1 I
41、nsulating parts can be applied over other insulating parts (multi-layerconstruction to which 4.3 refers). The design and construction of the tool mightnecessitate some overlap of insulating and conductive parts where joined at the toolworking head.All metallic parts shall be securely fixed to the in
42、sulating handle or insulatinginsert, as appropriate. Conformity shall be verified by means of the test specifiedin 8.3.3.The final assembly shall be constructed to prevent the ingress of moisture.Where insulating or hybrid insulating hand tools are assembled by the user fromcomponent parts, the inte
43、grity of the assembly shall be verified to be inaccordance with the specification for that tool or, in the absence of suchinformation, in accordance with BS EN 60900.NOTE 2 An example of such a tool is a ratchet handle with detachable socket head.5.2 Handle gripWhere the handle end incorporates a sl
44、eeve type grip, the adhesion of thesleeve shall be tested in accordance with 8.3.2.5.3 Insulating componentsWhere hollow or foam-filled insulating components are used in the constructionof a tool, design and/or construction measures shall be employed to preventinternal moisture accumulation or migra
45、tion.5.4 Additional requirements for particular insulating and hybridinsulating hand toolsIf the intended use for a tool dictates the necessity for additional requirementsparticular to that use, e.g. a multifunction hand tool such as a permanent wayspanner that can be used as both a hammer and a spa
46、nner, these shall beagreed between the manufacturer and the railway infrastructure controller. Theadditional requirements shall be fully documented and the tool shall conform tothese requirements in addition to the requirements specified in this BritishStandard.6 Properties6.1 Mechanical propertiesT
47、he mechanical properties of an insulating or hybrid insulating hand tool shallconform to the relevant requirements of the appropriate British Standard for anuninsulated tool having the same function: BS 876:1995 for hand hammers; BS 1421:1995 for picks, beater picks and mattocks; BS 2589:1955 for ra
48、ilway track spanners; BS 2945:1995 for axes and hatchets; BS 3388:2004 for forks, shovels and spades.BRITISH STANDARDBS 8020:20114 BSI 20116.2 Flame retardancyThe insulating material(s) shall be flame retardant and the flame retardancyshall be tested in accordance with 8.5.6.3 HardnessFor hybrid ins
49、ulating hand tools both the overguard and underguard insulatingmaterial hardness shall be above 40 on the Rockwell M scale, determined inaccordance with BS EN ISO 2039-2:2000.7 Marking and instructions for use7.1 MarkingEvery tool shall be legibly and permanently marked with the followinginformation: manufacturers name, trade mark or other identification; year of manufacture or traceability mark; double triangle symbol with rated working voltage (1 000 V) in accordancewith IEC 60417-5216 (DB:2002-10), as shown in
