Christine
You said “were installed into ITE equipment similar to a Server” If the PSU has been installed INTO equipment – I would imagine that the concern is not that the PSU may be unsafe by design, but that it has not been assessed for use in your equipment. This may require nothing more than a review of its report and a heating test. But you have labelled as certified equipment which is not. If you are not doing so already: - Confirm exactly what the NRTLs concerns are - Get the the NRTL to assess the equipment with the “wrong” PSU and find out whether it still complies. - In addition, your factory needs to review its goods-in procedures as they appear to have accepted and installed an alternative part without authorisation – this would be of concern to the inspector and NRTL as it begs the question “If they cannot correctly identify a large PSU, what else have they missed?” Regards Charlie From: Christine Rodham [mailto:chrisrod...@yahoo.com] Sent: 11 March 2010 16:58 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Also......60950 Pwr Supply vs. 60601 Pwr Supply- Interesting Issue Both. The FUS inspector wrote it up and the NRTL engineers issued a Variation Notice. --- On Thu, 3/11/10, Finlayson, Joseph <joseph.finlay...@mimio.com> wrote: From: Finlayson, Joseph <joseph.finlay...@mimio.com> Subject: RE: [PSES] Also......60950 Pwr Supply vs. 60601 Pwr Supply- Interesting Issue To: "Christine Rodham" <chrisrod...@yahoo.com>, EMC-PSTC@LISTSERV.IEEE.ORG Date: Thursday, March 11, 2010, 8:26 AM Christine, Is it the FUS Inspector that raised this as an issue that requires resolution or is it both the FUS Inspector and the NRTL engineers that believe it is an issue? Keep in mind that it is the job of the FUS Inspector to raise discrepancies between the what is contained in the report and what is being shipped. This may be able to be resolved by presenting your position that the power supplies meet the requirements of EN 60950-1 (if they, in fact, do). Thx, Joe ________________________________ From: Christine Rodham [mailto:chrisrod...@yahoo.com] Sent: Thursday, March 11, 2010 11:18 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Also......60950 Pwr Supply vs. 60601 Pwr Supply- Interesting Issue Note that this error was discovered during a follow up inspection and the NRTL is making a huge deal about it. Christine --- On Thu, 3/11/10, Joe Randolph <j...@randolph-telecom.com> wrote: From: Joe Randolph <j...@randolph-telecom.com> Subject: Re: 60950 Pwr Supply vs. 60601 Pwr Supply- Interesting Issue To: "Christine Rodham" <chrisrod...@yahoo.com>, EMC-PSTC@LISTSERV.IEEE.ORG Date: Thursday, March 11, 2010, 7:54 AM On 3/11/2010, Christine Rodham wrote: Dear List Members, One of our suppliers inadvertently shipped us a power supply that was certified to 60601 instead of 60950. About 200 of these medical grade power supplies were installed into ITE equipment similar to a Server. While we know this is a violation, we are all wondering about the following: * What are the physical differences between the two types of pwr supplies ( 60950 vs 60601) * What safety events would most likely occur due to this error? * What specific components could fail and why. We plan to recall and replace the power supplies but should this be a methodical approach or a 911 approach informing the customers to immediately shutdown the equipment. So far, the equipment has been running for approximately 6 months with no issues. Hi Christine: Well, this is an interesting situation to consider. It may turn out to be a non-event, so I suggest you proceed promptly but methodically. Based on the limited information you have provided, I don't (yet) see the need for the 911-type option. I work mostly with 60950. In my limited work with 60601, I have formed the impression that the requirements of 60601 are pretty much a super set of 60950. In other words, a power supply that complies with 60601 probably also complies with 60950. The reverse is often not be the case. So, you should do some careful analysis to see whether there is a problem. You should also talk with the safety agency that approved your end product, presumably based on the requirement that your power supply be compliant with 60950. They may be willing to accept the accidental substitution. In performing your analysis, it is important that you focus your attention on whether there are any ACTUAL hazards when this PARTICULAR power supply is used in YOUR product. Sorry for the "shouting," but this distinction is important. Both 60950 and 60601 contain hundreds of possible requirements that may or may not be applicable to this particular power supply and your particular end product. It would be a waste of time to try and approach this on a theoretical comparison of the two standards. Look at what you actually have, and try to determine whether what you have complies with 60950. Chances are that it does, and a recall will not be necessary. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) j...@randolph-telecom.com http://www.randolph-telecom.com <http://www.randolph-telecom.com/> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org <http://us.mc557.mai .yahoo.com/mc/compose?to=emc-p...@ieee.org> > All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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