Brian, All quite true and it has been a bit of a problem when working with clients who assume that if the PSU has any kind of an agency monogram, it must be okay.
One other area of concern, often overlooked, is the application of overvoltage (formerly measurement) categories. Although 60950 is not very explicit in this regard, you can see that it's spacings are based in category II only. Meanwhile 61010-1 has the possibility of category III. If the client insists on using a Cat II PSU in a Cat III application, the only solution is to do category reduction prior to the PSU. Finally, there are altitude requirements for greater than 2000 meters. Finding 60950-1 PSU certified to 3000 meters is extremely difficult. Thanks, - doug Douglas Powell http://www.linkedin.com/in/dougp01 Original Message From: Kunde, Brian Sent: Wednesday, December 17, 2014 7:07 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Reply To: Kunde, Brian Subject: Re: [PSES] 60950-1 PSU in a 61010-1 product The IEC/EN/UL 61010-1 3rd Ed. section 1.1.3 has this statement which may be helpful: "NOTE Computing devices and similar equipment within the scope of IEC 60950 and conforming to its requirements are considered to be suitable for use with equipment within the scope of this standard. However, some of the requirements of IEC 60950 for resistance to moisture and liquids are less stringent than those in this standard (see 5.4.4 second paragraph))." Also keep in mind that some ISM equipment is used in a harsher environment than IT equipment, so you need to make sure your 60950 power supply will work safely and properly in the end user environment. The Other Brian -----Original Message----- From: Gary McInturff [mailto:gary.mcintu...@esterline.com] Sent: Tuesday, December 16, 2014 6:39 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] 60950-1 PSU in a 61010-1 product One of the selling points in the risk based version of 60601 was the ability to do things outside of the prescriptive nature of the standard. Including the use of ITE products which I believe meant 60950 power supplies were the main point of interest. I haven't tried that approach so I don't know what it takes other than you risk files that you already have to generate, but if you haven't I would discuss this directly with the safety folks you are submitting to. I suspect you are going to have to address leakage current, flame and single fault failures and calamities at a minimum. Not so much the line engineer but the subject matter experts or minimally the section heads. I've gotten useful information from both, but your mileage will vary. I presume you're wanting the 60950 supply for cost? Just curious. Gmac -----Original Message----- From: Brian Oconnell [mailto:oconne...@tamuracorp.com] Sent: Tuesday, December 16, 2014 2:19 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] 60950-1 PSU in a 61010-1 product At least two test labs have written papers about use of ITE component power supplies in equipment scoped for 61010. The Emperor's search engine should suffice. Am very careful about recommending use of my employers ITE-certified stuff in customer's test equipment. The 61010 3d edition has some significant changes that could affect requirements not addressed in a 60960 CB report. So it depends on the end-use equipment construction, ratings, and power supply construction. Brian From: Amund Westin [mailto:am...@westin-emission.no] Sent: Tuesday, December 16, 2014 2:02 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] 60950-1 PSU in a 61010-1 product The final product will be tested according to IEC/EN61010-1 (measurement, control, and laboratory use). To power this product, an open frame AC/DC power will be uses and it holds a CB certificate according to IEC/EN60950-1. Will we run into trouble with this configuration? In the past, the final product was powered by a medical PSU (IEC/EN60601-1). I would like to switch to the 60950-1 PSU if possible …. #Amund - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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