I'd be surprised if 85dB(A) for 8 hours a day didn't result in profound hearing loss over an extended time.
And what does @ 3m mean in a workplace; 3 metres from what? There may be more than one source of noise in a factory or workshop. _______________________________________________________________________________ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: Doug Nix <d...@mac.com> To: EMC-PSTC@LISTSERV.IEEE.ORG Date: 09/04/2012 02:21 PM Subject: Re: [PSES] Buzzer loudness standard? Gary, No. " ...3dB above the maximum OSHA 8 hour day background limit @ 3 meters..." See the table in 1910.95. These are the absolute limits. Other jurisdictions, like Ontario where I live, have lower limits. 85 dB(A) TWA 8h here. Also see the ACGIH tables in the TLV's and BEI's. You'll find corroborating data. The EU is considering lower limits. Having said that, if you know that your intended use environment is quieter than that, then feel free to spec it lower, BUT that will not conform to the text of the standard originally quoted. -- Doug Nix d...@mac.com “Scientists investigate that which already is; Engineers create that which has never been.” - Albert Einstein On 4-September-2012, at 11:53, McInturff, Gary wrote: Doug, doesn’t OSHA have different levels for different environments – machinery rooms where they have to have ear protection can go up to 90, but offices would certainly be less than that. I think a “quiet office” is around 55 dBA Gary From: Doug Nix [mailto:d...@mac.com] Sent: Tuesday, September 04, 2012 8:42 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Buzzer loudness standard? Actually it does. OSHA 1910.95 tells you that the maximum time-weighted average (TWA) noise exposure for 8 hours is 90 dB(A). Based on the instrument standard you quoted, this means the buzzer must emit at least 93 dB(A). See 29 CR 1901.95, Table G-16, http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9735 Doug Nix On 4-September-2012, at 00:34, Curt McNamara wrote: We have a customer product where they desire to reference an industry standard for the loudness of a buzzer. They started with OSHA 3dB over ambient: the instrument shall have an audible indicator detected 3dB above the maximum OSHA 8 hour day background limit @ 3 meters. However that doesn't really tell us how loud it needs to be. It is used in a clinic where animals are treated. Any suggestions? Thanks! Curt - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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