CSA STANDARD ON HEARING PROTECTION DEVICES NHCA - 2016 CSA STANDARD ON HEARING PROTECTION DEVICES Z94.2-14 A. Behar – Ryerson University D. Shanahan - CSA

Presentation Contents 1. NATURE OF THE STANDARD 2. HISTORY OF THE STANDARD 3. PREVIOUS STANDARD (1994) 4. WHY A NEW STANDARD? 5. PRESENT DRAFT 6. WHAT’S NEXT?

A STANDRD THAT IS NOT “MEASURING” BUT BASICALLY AN “APPLICATION” ONE: full title: Z94.2-14 HERARING PROTECTION DEVICES – PERFORMANCE, SELECTION, CARE AND USE

HISTORY OF THE Z94.2 STANDARD Editions published in: 1965 1974 1979 1984 1994 2002 and 2014 . * CSA Standards must be revised every 5 years.

WHY A NEW STANDARD? A. PROBLEMS WITH THE PREVIOUS VERSION: i) Users familiar with the NRR, not comfortable with the Class system No NRR derating guidance No discussion on new developments including FAES Structure not user’s friendly

B. NEW DEVELOPMENTS: i) New ANSI attenuation testing standard (ANSI S12.6 - 97) ii) New ISO Standard with 3 different rating scales (ISO 4869-2) - Octave bands - HML - SNR

CSA-Z94.2-14 Dec. 2014 Edition An All New and Greatly Improved CSA Standard!

Test procedures and classification Only one test to be performed: - Force Measurement (for muffs and semi- inserts) Sound Attenuation test performed as per either a) ANSI S3.19 – 1974, or b) ANSI/ASA S12.6 - 1997 (Method B)

Measurement of Threshold of Hearing ANSI S3.19 “Real Ear” Measurement of Attenuation Over a Range of Frequencies (125 – 8,000 Hz). Measurement of Threshold of Hearing (with and without protectors) OPERATOR HELP DON PROTECTORS!

Measurement of Threshold of Hearing ANSI S12.6 (Method B) “Real Ear” Measurement of Attenuation Over a Range of Frequencies (125 – 8,000 Hz). Measurement of Threshold of Hearing (with and without protectors) SUBJECT DONS PROTECTORS!

From the measurement results following procedures in the USING METHOD IN ANSI 3.19 From the measurement results - Classes A, B and C and - NRR are calculated following procedures in the previous Standard .

SNR(SF16) From the measurement results a Single Number Rating USING ANSI S12.6, METHOD B From the measurement results a Single Number Rating SNR(SF16) is calculated.

Selection, of Hearing Protection Devices Important Sections: Types of HPDs Sound attenuation i) Reasons for not achieving lab results ii) Derating approaches

iii) Attenuation at frequency extremes iv) Effectiveness (duration of wearing HPDs) v) Double protection vi) Overprotection Specialized HPDs FAES

Certification friendly (example in Annex) Expanded Annexes Requirement for use of octave band calculation for Lex >105 dBA

Selection of Protectors: a. CLASS A, B or C b. Single Number Rating c. SNR(SF84) d. Octave-Band Computation

(Percentage of NRR achieved) DERATING OF NRR (Percentage of NRR achieved) Plugs: 50% Muffs: 70% Dual protection: 65%

Correction when measuring ambient noise level in dBA: - 3 dB. Aplicable to NRR and to SNR(SF84)

75 - 80 Good Table 4: Protection Outcome Resulting sound level Protection outcome 85 + Insufficient 80 - 85 Acceptable 75 - 80 Good 70 - 75 Overprotection

Other Sections deal with: - Fit, Care and Use - Implementation (of the HPDs program)

Hearing protection programs to be part of a management system Recommendation: Hearing protection programs to be part of a management system (in line with the CSA Z1007 Standard

Thank you! Any questions?