【BS英国标准】BS EN 13087-8-2000 防护帽.试验方法.电气特性 (Protective helmets - Test methods - Electrical properties).doc

BRITISH STANDARDProtective helmets Ð Test methods ÐPart 8: Electrical propertiesThe European Standard EN 13087-8:2000 has the status of aBritish StandardICS 13.340.20| BS EN13087-8:2000|NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 13087-8:2000National forewordThis British Standard is the official English language version of EN 13087-8:2000.The UK participation in its preparation was entrusted to Technical Committee PH/6, Head protection, which has the responsibility to:Ð aid enquirers to understand the text;Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;Ð monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using theªFindº facility of the BSI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amd. No.DateCommentsThis British Standard, having been prepared under the direction of the Health and Environment Sector Committee, was published under the authority of the StandardsCommittee and comes into effect on 15 December 2000BSI 12-2000ISBN 0 580 36445 3Amendments issued since publicationEUROPEAN STANDARD NORME EUROPÉENNEEUROPÄISCHE NORMEN 13087-8October 2000ICS 13.340.20English versionProtective helmets - Test methods - Part 8: Electrical propertiesCasques de protection - Méthodes d'essai - Partie 8: Propriétés électriquesSchutzhelme - Prüfverfahren - Teil 8: ElektrischeEigenschaftenThis European Standard was approved by CEN on 14 July 2000.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I TÉ EUR O P ÉEN DE NOR M A L I S A TI ON EUR O P Ä I S C H ES KOM I TEE F Ü R NOR M UNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels© 2000 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 13087-8:2000 EPage 7EN 13087-8:2000CONTENTSForeword . 2Introduction . 31 Scope . 32 Normative references . 33 Terms and definitions . 34 Prerequisites . 35 Methods . 4Annex A (normative) Test results Uncertainty of measurement . 6Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives . 7ForewordThis European Standard has been prepared by Technical Committee CEN/TC 158 "Head protection", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2001, and conflicting national standards shall be withdrawn at the latest by April 2001.This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.It consists of ten Parts as follows: Part 1 : Conditions and conditioningPart 2 : Shock absorptionPart 3 : Resistance to penetrationPart 4 : Retention system effectivenessPart 5 : Retention system strengthPart 6 : Field of vision Part 7 : Flame resistance Part 8 : Electrical properties Part 9 : Mechanical rigidityPart 10 : Resistance to radiant heatIntroductionThis standard is intended as a supplement to the specific product standards for protective helmets (helmet standards). Test methods may be applicable to complete helmets or parts thereof, and may be referenced in the other helmet standards.Performance requirements are given in the appropriate helmet standard, as are such details as the number of samples, preconditioning, preparation of samples for the tests, sequence and duration of testing and assessment of test results. If deviations from the test method given in this standard are necessary, these deviations will be specified in the appropriate helmet standard.1 ScopeThis European Standard describes methods of test for protective helmets. The purpose of these tests is to enable assessment of the performance of the helmet as specified in the appropriate helmet standard.This standard specifies the methods of test for electrical properties2 Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).EN 13087-1 Protective helmets - Test methods - Part 1 : Conditions and conditioning3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in this European Standard may be found in the appropriate helmet standard.4 PrerequisitesIn order to implement this standard, at least the following parameters shall be specified in the appropriate helmet standard:a)performance requirements b)number of samplesc)preparation of samplesd)sequence of conditioning e)sequence of testsf)method(s) of test - 5.3 and/or 5.4 and/or 5.55 Methods5.1 GeneralTesting shall be performed in ambient conditions specified in EN 13087-1.When the test method specifies that the helmet shall be fitted to a headform, this shall be done in accordance with the manufacturer's fitting instructions, if supplied. If none are supplied, the helmet shall be fitted so as to simulate typical fitting in use.Three test methods are specified.The method given in 5.2 is intended to simulate closely the in-use situation - that is, the leakage current to the wearer via a live conductor touching the shell.The method given in 5.3 is dependent only upon the transverse resistance of the shell (thickness). This effectively precludes the use of a metal shell and of holes or metal fasteners passing through the shell.The method given in 5.4 is dependent only upon the surface resistance of the shell and effectively precludes the use of shells which have a conductive surface (eg metal electro-plating). This test is deemed to be necessary in order to obviate the danger to the wearer should he/she try to remove a helmet whose shell is in contact with a live conductor.The method(s) to be used is/are specified in the helmet standard.5.2 Conductive headform test5.2.1 PrincipleThe leakage current between the outside and inside of the complete helmet and retention system, (as supplied by the helmet manufacturer) is measured at a specified voltage, when the helmet is mounted on a metal headform.5.2.2 ProcedureImmerse the complete sample helmet and retention system in fresh tap water at room temperature for a period of (15 ± 2) min. Remove the helmet from the water and allow to drain for between 1 and2 min max.Mount the sample helmet on an appropriate sized aluminium headform, in the manner it is intended to be worn, and secure firmly with the retention system.Apply an alternating test voltage at nominally 50 Hz or 60 Hz between the aluminium headform and a suitably insulated hand-held metal probe of 4 mm diameter and with a hemispherical radiused end.Apply the probe at any point on the external surface of the helmet shell situated at, or above, its lower edge.At each test point, increase the voltage at a steady rate to (1200 ± 25) Vac within 1 min and maintain it at this value for (15 ± 2) s. Record the leakage current at this voltage to the nearest 0,1 mA, together with any evidence of breakdown.Repeat the test in order to investigate at least three test points.5.2.3 Test reportReport the leakage currents measured, together with any occurrences of breakdown.5.3 Wet helmet insulation test5.3.1 PrincipleThe leakage current between the outside and inside of the helmet shell is measured at a specified voltage.5.3.2 ProcedurePlace th e helmet shell in a (3 ± 0,2) g/l solution of sodium chloride at a temperature of(22 ± 5)C for (24 ± 0,5) h. Remove the helmet shell, wipe it and place it upside down in a containerof appropriate size. Fill the container and the helmet shell with the sodium chloride solution, up to 10 mm below the lowest point on the lower (as worn) edge of the shell.Where necessary, adjust the orientation of the helmet shell in the sodium chloride solution in order to accommodate shells whose lower edge is not straight.Apply an alternating test voltage at nominally 50 Hz or 60 Hz between an electrode immersed in the solution inside the helmet shell and another electrode in the container, outside of the helmet shell.Increase the voltage at a steady rate to (1200 ± 25) Vac within 1 min and maintain it at this value for (15 ± 2) s. Record the leakage current at this voltage to the nearest 0,1 mA, together with any evidence of breakdown.5.3.3 Test reportReport the leakage currents measured, together with any occurrences of breakdown.5.4 Surface insulation test5.4.1 PrincipleThe leakage current between any two points on the surface of the helmet shell is measured at a specified voltage.5.4.2 ProcedureEnsure that the shell of the helmet is dry before the test.Apply an alternating test voltage at nominally 50 Hz or 60 Hz between two suitably insulated hand-held metal probes of 4 mm diameter and with hemispherical radiused ends.Apply the probes to any two points on the surface of the helmet shell (inside and/or outside) located not closer than 20 mm to each other.At each test point, increase the voltage at a steady rate to (1200 ± 25) Vac within 1 min and maintain it at this value for (15 ± 2) s. Record the leakage current at this voltage to the nearest 0,1 mA, together with any evidence of breakdown.Repeat the test in order to investigate at least three test points.5.4.3 Test reportReport the leakage currents measured, together with any occurrences of breakdown.Annex A(normative)Test results Uncertainty of measurementFor each of the required measurements performed in accordance with this standard, a corresponding estimate of the uncertainty of measurement shall be evaluated. This estimate of uncertainty shall be applied and stated when reporting test results, in order to enable the user of the test report to assess the reliability of the data.Annex ZA(informative)Clauses of this European Standard addressing essential requirements or other provisions of EU DirectivesThis European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of EU Directive on personal protective equipment (PPE) 89/686/EEC.WARNING Other requirements and other EU Directives may be a