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Measurement of noise exposure
This is the fifth edition of CSA Z107.56, Measurement of noise exposure. This edition supersedes the previous editions published in 2013, 2006, 1994, and 1986. Key changes to this edition include the following
This Standard should be used in conjunction with CSA Z1007, Hearing loss prevention program (HLPP) management, which deals with all aspects of the creation and management of hearing conservation programs. This Standard complements other CSA hearing conservation standards, including CSA Z94.2 (hearing protection), CSA Z107.6 (audiometric testing for use in hearing loss prevention program), CSA Z107.58 (noise emission declarations for machinery), CAN/CSA-ISO 5349 (hand-transmitted vibration), and ISO 2631 (whole-body vibration). This Standard was prepared by the Subcommittee on Noise Exposure Assessment and Control, under the jurisdiction of the Technical Committee on Occupational Hearing Conservation and the Strategic Steering Committee on Occupational Health and Safety, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group
This Standard describes methods for determining the occupational noise exposure level of workers (Lex,T) using sampling techniques. Lex,T represents the long-term noise exposure of workers and is calculated from measurements of Leq,t (3 dB exchange rate) in the workplace.
Notes:
This Standard complements other CSA Group and ISO hearing loss prevention standards (see Figure 2), as follows
This Standard provides methods for measuring the occupational noise exposure from all types of noise, e.g., continuous noise, tonal noise, and impulsive noise. All types of noise (including impulsive noise) are included in a single equivalent sound level for an individual or group. Note: Although this Standard was written to measure noise exposure in the workplace, it can equally be used to measure non-occupational noise exposures, including those from music players, radios, or other sound reproduction devices.
This Standard can be used to determine the noise exposure level of individuals (Lex,T) or extended to groups (LGroup) with similar noise exposures. It can also be used to measure the average noise (Leq,t) from a given job or activity (e.g., operating a particular machine).
The following subjects are not addressed in this Standard
Note: Such surveys can be a precursor to noise exposure measurements, but in most cases noise exposure measurements as described here are more useful and can be commenced directly without a survey. Guidance on conducting sound level surveys is provided in Annex D
This Standard provides methods to determine the noise exposure level of workers with a given precision. In certain cases, the user is only interested in determining that a worker's exposure is above or below the criterion level. Therefore, the methods in this Standard can be less rigorously applied when the noise exposure level is either far above or far below the criterion level.
In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
| SDO | CSA: Canadian Standards Association |
| Document Number | |
| Publication Date | Jan. 1, 2018 |
| Language | en - English |
| Page Count | 53 |
| Revision Level | |
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