Zohar, As always, it depends...
In the past I've used housekeeping PSUs certified to EN60950 in applications for EN61010-1 and EN50178. But this only works when I can show that I have met certain requirements in the end product. Basically, it involves synchronizing the Overvoltage Category and Pollution Degree ratings of the power supply. EN60950 is unique from other standards in that it assumes you are always designing the product to Over Voltage Category II (OV II) and Pollution Degree 2 (PD2). IEC/EN61010-1 does not do this and its scope includes other environmental conditions. This is especially clear if you look at the second edition of IEC 61010-1. For example, if you are using an EN60950 certified PSU (i.e. OV II, PD2) in an EN61010-1 end product that is qualified to OV III, you will need to deliberately reduce the OV Category prior to connecting the power supply. There are a few methods for doing this, one of the most common is to use a qualified isolating transformer. In addition, if you are certifying your end product to PD3 and wish to use the EN60950 PSU, you will need to deliberately lower the Pollution Degree to PD2. Usually this can be done by partitioning the PSU into an enclosed area, away from the PD3 air flow or by using conformal coatings to create a micro-environment of PD1, or PD2 at the surface of a PCB. If you decide to use the conformal coating route, see if your vendor can do this and keep their product certs intact. Otherwise, you run the risk of violating the PSU certifications in some way. Hope this helps a little. -doug Douglas E. Powell Corporate Compliance Dept. Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA From: [email protected] [mailto:[email protected]] Sent: Tuesday, July 01, 2003 1:55 AM To: [email protected] Subject: UL 60950 external power supply to use with UL 61010-1 product Dear Grope members, I need to certify an ADSL Analyzer (IEC 61010-1), which externally powered >from UL listed power supply approved to UL 60950 (provided with the Analyzer). My question is: Does the external power supply should be approved to UL/IEC 61010-1, or UL 60950 is accepted. Thanks, any information will be very helpful Zohar This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc _______________________________________________________________ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
