1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 13.340.20 ISBN 0-626-17320-5 SANS 50352-7:2005Edition 1EN 352-7:2002Edition 1SOUTH AFRICAN NATIONAL STANDARD Hearing protectors Safety requirements a
4、nd testing Part 7: Level-dependent ear-plugs This national standard is the identical implementation of EN 352-7:2002 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 01
5、2 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 50352-7:2005 Edition 1 EN 352-7:2002 Edition 1 Table of changes Change No. Date Scope Abstract Specifies constructional, design and performance requirements, methods of test, marking requirements and
6、 user information relating to the incorporation of an electronic level-dependent sound restoration facility in ear-plugs. Keywords ear-plugs, ear protectors, occupational safety, protective equipment. National foreword This South African standard was approved by National Committee StanSA TC 76, Acou
7、stics, electro-acoustics and vibration, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. Note that in annex A no mention is made of the confidence level to be used when applying the uncertainty of measurement. It is proposed that K=2 or a
8、95 % confidence level is used. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 352-7December 2002ICS 13.340.20English versionHearing protectors - Safety requirements and testing - Part 7:Level-dependent ear-plugsProtecteurs individuels contre le bruit - Exigences descurit et essais - Partie 7: Bou
9、chons doreilles attnuation dpendante du niveauGehrschtzer - Sicherheitstechnische Anforderungen undPrfungen - Teil 7: Pegelabhngig dmmendeGehrschutzstpselThis European Standard was approved by CEN on 16 October 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stip
10、ulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists
11、 in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of
12、Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManag
13、ement Centre: rue de Stassart, 36 B-1050 Brussels 2002 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 352-7:2002 EEN 352-7:2002 (E)2ContentspageForeword3Introduction .41 Scope 42 Normative references43 Terms and definitions .54 Requ
14、irements.55 Testing66 Information supplied by the manufacturer .67 Marking.7Annex A (informative) Uncertainty of measurement and interpretation of test results8Annex B (informative) Determination of criterion level for level-dependent ear-plugs .10Annex ZA (informative) Clauses of this European stan
15、dard addressing essential requirementsor other provisions of EU Directive.12Bibliography 13EN 352-7:2002 (E)3ForewordThis document (EN 352-7:2002) has been prepared by Technical Committee CEN/TC 159, “Hearing protectors“,the secretariat of which is held by SIS.This European Standard shall be given t
16、he status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2003, and conflicting national standards shall be withdrawn at the latest byJune 2003.This document has been prepared under a mandate given to CEN by the European Commission and the E
17、uropeanFree Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directives, see informative Annex ZA, which is an integral part of this standard.In this standard the annexes A and B are informative.According to the CEN/CENELEC Internal Regulations, the
18、national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Ki
19、ngdom.EN 352-7:2002 (E)4IntroductionThis standard for ”Hearing Protectors Safety requirements and testing Part 7: Level-dependent ear-plugs”,specifies procedures for the testing of personal hearing protection devices in relation to Directive 89/686/EEC -Personal Protective Equipment.EN 352-1 deals w
20、ith requirements for ear-muffs, EN 352-2 with ear-plugs, EN 352-3 with ear-muffs attached toindustrial safety helmets. EN 13819-1 and EN 13819-2 deal with testing plans common to all types of hearingprotectors covered by this series of ENs.Additional safety requirements and the associated test proce
21、dures for level-dependent ear-muffs are contained inEN 352-4, for ear-muffs with active noise reduction in EN 352-5 and for ear-muffs with electrical audio input facilityin EN 352-6. An associated standard EN 458, covers selection, use, care and maintenance of hearing protection.The particular requi
22、rement for hearing protectors in relation to their ability to reduce noise to below daily limit levels setby Directive 86/188/EEC - “on the protection of workers from the risks related to exposure to noise at work“ isaddressed in the standard by means of a requirement to report in which noise enviro
23、nments the hearing protector maybe used without exceeding the relevant action level set by that Directive.The test method for hearing protector attenuation described in EN 24869-1 and applied in Parts 1, 2 and 3 is notsufficient for level-dependent ear-plugs. Additional methods of measurement, for t
24、he purposes of determining thesound delivered to the wearers ear from the sound restoration circuit, are under consideration. Until such time as thiswork is completed, the test method described in Annex B of this standard is recommended for level-dependent ear-plugs, in addition to the EN 24869-1 te
25、st.Level-dependent ear-plugs are designed to provide restoration of external sounds, while providing attenuation ofsounds at high levels. They may be selected for use in intermittent or impulsive noise environments and where externalwarning sounds are required to be heard. This standard is concerned
26、 with those ear-plugs having an electronic soundrestoration circuit.This part of the standard is a specification intended for type approval purposes, for which 4 sets of specimen ear-plugsare tested, (further samples may be required for testing under EN 352-2).The requirements and tests of the stand
27、ard are concerned primarily with the level-dependent performance of theear-plugs.1 ScopeThis European Standard is concerned with ear-plugs fitted with an electronic level-dependent sound restorationfunction. It specifies additional constructional, design and performance requirements, methods of test
28、, markingrequirements and user information relating to the incorporation of the level-dependency facility. The performance of theear-plug in impulsive noise is not addressed.The requirements of this standard are intended to take account of the ergonomic interaction between the wearer,the device and,
29、 where possible, the working environment in which the device is likely to be used (see Annex ZA ofthis standard and EN 458)2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropria
30、te places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication r
31、eferred to applies (including amendments).EN 352-2:2002, Hearing protectors - General requirements - Part 2: Ear-plugsEN 13819-1, Hearing protectors - Testing - Part 1: Physical test methodsEN 352-7:2002 (E)53 Terms and definitionsFor the purposes of this European Standard the terms and definitions
32、given in EN 352-2:2002 and the followingterms and definitions apply:3.1 criterion level (H)A-weighted sound pressure level of the H noise for which the A-weighted diffuse-field related sound pressure levelwhen a level-dependent ear-plug is worn first exceeds 85 dB(A), calculated as the mean plus one
33、 standard deviationperformance for the samples tested3.2 criterion level (M)A-weighted sound pressure level of the M noise for which the A-weighted diffuse-field related sound pressure levelwhen a level-dependent ear-plug is worn first exceeds 85 dB(A), calculated as the mean plus one standard devia
34、tionperformance for the samples tested3.3 criterion level (L)A-weighted sound pressure level of the L noise for which the A-weighted diffuse-field related sound pressure levelwhen a level-dependent ear-plug is worn first exceeds 85 dB(A), calculated as the mean plus one standard deviationperformance
35、 for the samples tested3.4 level-dependent ear-plugear-plug fitted with an electronic level-dependent sound restoration circuit3.5 sound restoration circuitelectroacoustic device intended to reproduce lower level external sounds in the ear canal, while usually providingattenuation of higher level so
36、unds by means of a level-dependent gain function4 Requirements4.1 GeneralLevel-dependent ear-plugs shall meet the requirements of EN 352-2. Additional requirements are listed below.4.2 Materials and constructionThe electronic circuit of the level-dependent ear-plug shall meet the electrical safety a
37、nd EMC requirementsappropriate to this class of equipment.4.3 Performance4.3.1 GeneralLevel-dependent ear-plugs shall meet all the performance requirements of EN 352-2, including the minimumattenuation requirement in their passive mode. Additionally, the requirements specified below in 4.3.2 shall b
38、e satisfied.Specimens of ear-plugs shall be conditioned and tested as specified in 5.1.1 and 5.1.2. The scheme of testing shall beas specified in 5.1.3.EN 352-7:2002 (E)64.3.2 Criterion levelsThe criterion levels for the three noises H, M and L determined in accordance with 5.2 shall be reported in
39、wearerinformation (6.1).5 Testing5.1 Specimens, conditioning and scheme of testingThis scheme of testing is additional to that described in EN 13819-1. It shall be carried out on additional samples.5.1.1 SpecimensFour sets of ear-plugs shall be submitted for testing. The individual ear-plugs shall b
40、e numbered 1 to 8. Fresh batteriesshall be fitted for the test.5.1.2 Conditioning and testing atmosphereAll specimens shall be conditioned and tested in an atmosphere having a temperature of 22 oC 5 oC and a relativehumidity of not more than 85 %, as required in EN 13819-1.5.1.3 Scheme of testingThe
41、 eight ear-plug specimens shall be tested for criterion levels as described in 5.2. The volume control of each ear-plug, if fitted, shall be set to maximum.5.2 Criterion levelsThe acoustic measurement procedures for level dependent ear-plugs are under consideration. For the time beingand because of
42、the urgent need, such measurements may be carried out in accordance with test proceduresdescribed in Annex B.6 Information supplied by the manufacturer6.1 Wearer informationThe following information for the wearer (in addition to that required by EN 352-2) shall be supplied with the ear-muffs:a) the
43、 number of this standard, EN 352-7;b) an indication as to whether the hearing protector provides a level-dependent facility;c) the values of the criterion levels as determined by the procedures described in the Annex B;d) recommended storage conditions before and after use;e) method of checking, cha
44、rging and changing batteries;f) for ear-plugs with level-dependency, the statements:1) ”This ear-plug is provided with level-dependent attenuation. The wearer should check correct operationbefore use. If distortion or failure is detected, the wearer should refer to the manufacturers advice formainte
45、nance and replacement of the battery.”EN 352-7:2002 (E)72) ”Warning - Performance may deteriorate with battery usage. The typical period of continuous use that can beexpected from the ear-plug battery is hours (to be inserted by the manufacturer).”3) ”Warning - The output of the level-dependent circ
46、uit of this hearing protector may exceed the daily limit soundlevel.”g) the address from which additional information can be obtained.Information according with 6.1 shall be provided at least in the official language(s) of the European state of destination.6.2 Additional informationThe following inf
47、ormation shall be available from the manufacturer on request:a) results of tests performed in accordance with this standard;b) the name and country of the test laboratory which performed the tests specified and the date of the tests.Information according with 6.2 shall be provided at least in the of
48、ficial language(s) of the European state of destination.7 MarkingThe requirements for marking given in EN 352-2 shall be used. The generic mark “EN 352” as specified in EN 352-2 is used, since a product may meet EN 352-2 and EN 352-7 simultaneously.EN 352-7:2002 (E)8Annex A(informative)Uncertainty o
49、f measurement and interpretation of test resultsFor each of the required measurements performed in accordance with this standard, a corresponding estimate ofthe uncertainty of measurement should be evaluated.This estimate of uncertainty should be applied and stated when reporting test results, in order to enable the user ofthe test report to assess the reliability of the data.The following protocol with regard to uncertainty of measurement should be applied to test results:If the limit value for the particular test given in the standard falls outside of the
