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Hearing Protection Standards Hearing Protection Standards guide noise safety when noise cannot be sufficiently reduced due to the intrinsic properties of a particular action or environment. Tools used at, for example, construction sites, frequently cannot be made any quieter, and the worker’s proximity to the tool means the sound cannot readily be attenuated either. This leaves the utilization of hearing protection as a major component of a noise safety arsenal. Other times, people are only temporarily subjected to loud noises, making it so that the use of individual hearing protection is more effective than dealing with the noise itself. Key examples of this case are demolitions, where the noise is very loud but short lived, or rooms that are always loud but only require human presence at limited intervals.

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ANSI/ASA S12.42-2010
Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures
This standard provides methods for the measurement of the insertion loss of hearing protectiondevices in specified continuous and impulsive noise environments. The microphone-in-real-ear(MIRE) method utilizes human test subjects and may be used for hearing protectors that enclose theears and make supra-aural or circumaural contact with the head, whereas the acoustical test fixture(ATF) method employs an inanimate fixture and can be used for any hearing protection device. Thestandard contains information on instrumentation, calibration, and electroacoustic requirementsincluding details regarding the sound field of test facilities, the acoustical characteristics of ATFs, andsubject selection and training and location of ear-mounted microphones for MIRE testing. Methods formeasuring or determining sound pressure levels in the ear are also specified as well as methods forreporting the calculated insertion loss.

ANSI/ASA S12.13 TR-2002 (R2010)
ANSI Technical Report Evaluating the Effectiveness of Hearing Conservation Programs through Audiometric Data Base Analysis.
This ANSI Technical Report describes methods for evaluating the effectiveness of hearing conservation programs in preventing occupational noise-induced hearing loss by using techniques for audiometric data base analysis. The rationale is given for using the variability of threshold measurements in annual monitoring audiograms as the basis for judging effectiveness. Guidelines are discussed concerning how to select a restricted data base to which the analysis procedures will be applied. Specific procedures for data analysis are defined, and criterion ranges are given for classifying program effectiveness as acceptable, marginal, or unacceptable. Sample results for industrial audiometric data bases contributed to Working Group S12/WG12 are included as an annex for reference and illustration.

ANSI/ASA S12.6-2008
Methods for Measuring the Real-Ear Attenuation of Hearing Protectors
Specifies laboratory-based procedures for measuring, analyzing & reporting passive noise-reducing capabilities of hearing protection devices. The procedures consist of psychophysical tests conducted on human subjects to determine real-ear attenuation measured at hearing threshold. Two fitting procedures are provided: Method A-trained subject fit and Method B-inexperienced subject fit, intended to approximate protection that can be attained by groups of informed users in workplace hearing conservation programs.

ANSI/ASSE A10.46-2013
Hearing Loss Prevention for Construction and Demolition Workers
This standard applies to all construction and demolition workers with potential noise exposures (continuous, intermittent and impulse) of 85 dBA and above. This standard is intended to help employers prevent occupational hearing loss among construction and demolition workers.

ISO 4869-1:1990
Acoustics - Hearing protectors - Part 1: Subjective method for the measurement of sound attenuation
Specifies a method for measuring sound attenuation at the threshold of hearing. The procedure is designed to yield values close to the maximum attenuation which are not normally attained under field conditions. The values reflect the attenuating characteristics only to the extent that users wear the device in the same manner as did the test subjects. Data are collected at low sound pressure levels but which are also representative of the values at higher sound pressure levels.

ISO 4869-2:1994
Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn
Describes three methods (the octave-band, HML and SNR methods) for estimating the A-weighted sound pressure levels effective when hearing protectors are worn. The methods are applicable to either the sound pressure level or the equivalent continuous sound pressure level of the noise. Although primarily intended for steady noise exposures, the methods are also applicable to noises containing impulsive components. They are not suitable for use with peak sound pressure level measurements.

This standard is also available from: ISO Corrigendum 2006  /  BS  /  DIN  /  DIN Corrigendum 2007  /  ON  /  SS  /  SS Corrigendum 2007

ISO 4869-3:2007
Acoustics - Hearing protectors - Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture
ISO 4869-3:2007 specifies a method for measuring the insertion loss of ear-muff type hearing protectors using an acoustic test fixture. The method is applicable to the investigation of production spreads of performance as part of type approval or certification procedures, and to the investigation of the change of performance with age. It is intended to ensure that ear-muff hearing protector samples submitted for subjective testing of attenuation according to ISO 4869-1 have performances typical of the type. The method specified in ISO 4869-3:2007 is not applicable as the basic test for type approval. Performance data obtained by this method are not intended to be quoted as representing the real-ear sound attenuation of an ear-muff, nor the protection provided by the ear-muff.

This standard is also available from: BS  /  DIN  /  ON  /  SS

ISO/TS 4869-5:2006
Acoustics - Hearing protectors - Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects
ISO/TS 4869-5:2006 specifies a method for measuring noise reduction of passive hearing protectors at the threshold of hearing. The method is designed to provide estimates of the noise reduction obtained by typical groups of users in real-world occupational settings, who may lack the training and motivation to wear hearing protectors in an optimum manner. The principle of the test method is to measure the difference in hearing threshold with and without wearing a hearing protector. This difference between the thresholds constitutes the noise reduction. The measurement is done twice on a given number of test subjects. This test method yields data that are collected at low sound pressure levels (close to the threshold of hearing), but which are also representative of the noise reduction values of hearing protectors at higher sound pressure levels. ISO/TS 4869-5:2006 is inapplicable for level-dependent hearing protectors for sound pressure levels above the point at which their level-dependent characteristics become effective.

This standard is also available from: SS

AS 2436-2010
Guide to noise and vibration control on construction, demolition and maintenance sites (FOREIGN STANDARD)

AS/NZS 1269.3:2005
Occupational noise management - Hearing protector program (FOREIGN STANDARD)
Specifies administrative responsibilities associated with a hearing protector program; the selection, use and maintenance of various types of hearing protectors; and training and motivation in regard to hearing protector programs.

CAN/CSA Z94.2-02 (R2011)
Hearing Protection Devices - Performance, Selection, Care, and Use
General Clauses 4 to 7 of this Standard cover performance and testing requirements for personal hearing protection devices. Clauses 8 to 12 cover the selection, care, and use of hearing protection devices as required for an effective hearing conservation program.

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