Hearing protectors - Safety requirements and testing - Part 4: Level-dependent ear-muffs

This part of the Standard is concerned with ear-muffs whose acoustic performance may be regarded as being level-dependent, including those fitted with electronic sound restoration circuits and/or noise cancellation systems. It specifies constructional, design and performance requirements, methods of test, marking requirements and user information. This part of the Standard does not deal with ear-muffs for attachment to a helmet or which are part of a helmet. Neither does  it deal with open-ear electronic earphones that are not intended to provide attenuation. The requirements of this standard are intended to take account of the ergonomic interaction between the wearer, the device and where possible the working environment in which the device is likely to be used (see Annex ZA, of this standard and EN 458).

Gehörschützer - Sicherheitstechnische Anforderungen und Prüfungen - Teil 4: Pegelabhängige Kapselgehörschützer

1 Anwendungsbereich
Diese  Europäische  Norm  ilt  für  pe elabhän i e  Kapsel ehörschützer.  Sie  le t  zusätzliche  Anforderun en
hinsichtlich Konstruktion, Gestaltun  und Leistun , Prüfverfahren, Anforderun en an die Kennzeichnun  und
an Benutzerinformationen hinsichtlich der Aufnahme der Vorrichtun  für die Pe elabhän i keit fest.

Protecteurs individuels contre le bruit - Exigences de sécurité et essais - Partie 4: Serre-tete a atténuation dépendante du niveau

La présente Norme européenne est applicable aux serre-tete a atténuation dépendante du niveau. Elle spécifie les exigences en matiere de construction, de conception, de performances, de méthodes d'essai et de marquage ainsi que les informations destinées a l'utilisateur pour ce qui concerne l'incorporation du dispositif d'atténuation dépendante du niveau.

Varovala sluha - Varnostne zahteve in preskušanje - 4. del: Naušniki, prilagodljivi ravni hrupa

General Information

Status
Withdrawn
Publication Date
30-Nov-2001
Withdrawal Date
16-Mar-2021
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
17-Mar-2021
Due Date
09-Apr-2021
Completion Date
17-Mar-2021

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SLOVENSKI STANDARD
SIST EN 352-4:2001
01-december-2001

Varovala sluha - Varnostne zahteve in preskušanje - 4. del: Naušniki, prilagodljivi

ravni hrupa

Hearing protectors - Safety requirements and testing - Part 4: Level-dependent ear-muffs

Gehörschützer - Sicherheitstechnische Anforderungen und Prüfungen - Teil 4:
Pegelabhängige Kapselgehörschützer

Protecteurs individuels contre le bruit - Exigences de sécurité et essais - Partie 4: Serre-

tete a atténuation dépendante du niveau
Ta slovenski standard je istoveten z: EN 352-4:2001
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
SIST EN 352-4:2001 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 352-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2001
ICS 13.340.20
English version
Hearing protectors - Safety requirements and testing - Part 4:
Level-dependent ear-muffs

Protecteurs individuels contre le bruit - Exigences de Gehörschützer - Sicherheitstechnische Anforderungen und

sécurité et essais - Partie 4: Serre-tête à atténuation Prüfungen - Teil 4: Pegelabhängige Kapselgehörschütze

dépendante du niveau
This European Standard was approved by CEN on 18 January 2001.

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 Management Centre 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 Management Centre 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
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 352-4:2001 E

worldwide for CEN national Members.
---------------------- Page: 2 ----------------------
Page 2
EN 352-4:2001
Contents
Page
Foreword 3
Introduction 4
1 Scope 4
2 Normative references 5
3 Terms and definitions 5
4 Requirements 6
5 Testing 6
6 Information supplied by the manufacturer 7
7 Marking 8
Annex A (normative) Test results, uncertainty of measurement 9
Annex B (informative) Determination of criterion level and spread out sound
transmission for level-dependent ear-muffs 10
Annex ZA (informative) Clauses of this European Standard addressing essential
requirements or other provisions of EU Directives 12
Bibliography 13
---------------------- Page: 3 ----------------------
Page 3
EN 352-4:2001
Foreword

This European Standard 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 the status of a national standard, either by publication

of an identical text or by endorsement, at the latest by September 2001, and conflicting

national standards shall be withdrawn at the latest by September 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.
---------------------- Page: 4 ----------------------
Page 4
EN 352-4:2001
Introduction

Level-dependent ear-muffs are designed to provide restoration of external sounds, while

providing attenuation of sounds at high levels. They may be selected for use in intermittent or

impulsive noise environments and where external warning sounds are required to be heard. This

Standard is concerned with those ear-muffs having an electronic sound restoration circuit.

This part of the Standard is a specification intended for type approval purposes, for which four

sets of specimen ear-muffs are tested.

The requirements and tests of the standard are concerned primarily with the level-dependent

performance of the ear-muffs.

This Standard for "Hearing Protectors - Safety Requirements and Testing: Level-dependent

ear-muffs", sets requirements for personal hearing protection devices in relation to

Directive 89/686/EEC - Personal Protective Equipment.

EN 352-1:1993 deals with requirements and test methods for ear-muffs, EN 352-2:1993 with

ear-plugs, EN 352-3:1996: with ear-muffs for attachment to safety helmets. Additional safety

requirements and the associated test procedures for ear-muffs with active noise reduction are

contained in prEN 352-5:2000, for ear-muffs with audio communications in prEN 352-6:2000

and for level-dependent ear-plugs in prEN 352-7:2000. An associated standard EN 458, covers

selection, use, care and maintenance of hearing protection.

The particular requirement for hearing protectors in relation to their ability to reduce noise to

below daily limit levels set by Directive 86/188/EEC - "on the protection of workers from the

risks related to exposure to noise at work" is addressed in the standard by means of a

requirement to report in which noise environments the hearing protector may be used without

exceeding the relevant action level set by that Directive.

An additional acoustic performance test method to that described in EN 24869-1 and applied in

EN 352-1:1993, EN 352-2:1993 and EN 352-3:1996 is required for level-dependent ear-muffs.

Methods of measurement are under consideration by CEN/TC 211. Until such time as this

work is completed the test method described in annex B of this standard is recommended for

level-dependent ear-muffs in addition to the EN 24869-1 test.
1Scope

This European Standard is applicable to level-dependent ear-muffs. It specifies additional

constructional, design and performance requirements, methods of test, marking requirements

and user information relating to the incorporation of the level-dependency facility.

---------------------- Page: 5 ----------------------
Page 5
EN 352-4:2001
2 Normative references

This 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

apply (including amendments).
EN 352-1 : 1993 Hearing protectors - General requirements - Part 1 : Ear-muffs
3 Terms and definitions

For the purposes of this European Standard the terms and definitions given in EN 352-1:1993

and the following definitions apply.
3.1
criterion level (H)

A-weighted sound pressure level of the H noise for which the A-weighted equivalent diffuse

field related sound pressure level when a level-dependent ear-muff is worn first
exceeds 85 dB(A)
3.2
criterion level (M)

A-weighted sound pressure level of the M noise for which the A-weighted equivalent diffuse

field related sound pressure level when a level-dependent ear-muff is worn first
exceeds 85 dB(A)
3.3
criterion level (L)

A-weighted sound pressure level of the L noise for which the A-weighted equivalent diffuse

field related sound pressure level when a level-dependent ear-muff is worn first
exceeds 85 dB(A)
3.4
level-dependent ear-muff
an ear-muff fitted with an electronic sound restoration circuit
3.5
sound restoration circuit

an electroacoustic device intended to reproduce lower level external sounds in the ear canal,

while usually providing attenuation of higher level sounds by means of a level-dependent gain

function
---------------------- Page: 6 ----------------------
Page 6
EN 352-4:2001
4 Requirements

Level-dependent ear-muffs shall meet the requirements of EN 352-1:1993. Additional

requirements are listed below.
4.1 Sizing

There are no additional requirements for level-dependent ear-muffs beyond those referenced in

EN 352-1:1993.
4.2 Materials and construction

No component of the ear-muff shall constitute an electrical safety hazard to the user.

4.3 Performance
4.3.1 General

Level-dependent ear-muffs shall meet all the performance requirements of EN 352-1:1993,

including the minimum attenuation requirement in their passive mode. Additionally, the

requirements specified below shall be satisfied.

Specimens of ear-muffs shall be conditioned and tested as specified in 5.1.1 and 5.1.2. The

scheme of testing shall be as specified in 5.1.3.
4.3.2 Criterion levels

The criterion levels for the three noises H, M and L determined in accordance with 5.2 shall

be reported in wearer information.
4.3.3 Spread of sound attenuation and sound transmission
The standard deviations reported in accordance with 5.3 shall not be grea
...

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