Description
This standard covers the measurement and rating of a working environment for hearing conservation purposes, the physical demarcation of an area where hearing conservations measures have to be applied and medical surveillance.
TABLE OF CONTENTS
| Content | Page |
| 1 Scope | 1 |
| 2 Normative references | 1 |
| 3 Definitions and abbreviated terms | 2 |
| 4 Noise rating limits | 8 |
| 5 Hearing conservation programme | 9 |
| 6 Assessment of noise | 11 |
| 7 Demarcation of noise zones | 11 |
| 8 Determination of the equivalent continuous rating level (LReq,T) | 11 |
| 9 Preparation for assessment of measurement area | 16 |
| 10 Assessment of measurement area (zoning) | 17 |
| 11 Reassessment of measurement area (rezoning) | 17 |
| 12 Reduction of noise | 17 |
| 13 Wearing of hearing protection equipment (see SANS 50458 for the use, care and selection of hearing protectors) | 18 |
| 14 Audiometry | 18 |
| 15 Audiometric equipment | 19 |
| 16 Maintenance and calibration of audiometric equipment | 20 |
| 17 Baseline audiometry | 21 |
| 18 Periodic screening audiometry | 22 |
| 19 Diagnostic audiology | 25 |
| 20 Exit audiometry | 26 |
| 21 Records | 27 |
| Annex A Reports | 28 |
| Annex B Mandatory symbolic sign for hearing protection(type designation: MV 4 – SANS 1186-1) | 32 |
| Annex C Hearing conservation measures for employees exposed to high-energy impulse noise, for example, gunshots or other explosive events | 33 |
| Annex D Calculation of noise exposure levels | 35 |
| Annex E Determination of percentage loss of hearing (PLH), and permanent disability | 38 |
| Bibliography | 42 |