2.6.1 of IEC 60950-1 refers to "parts of equipment shall be reliably connected to the main protective earthing terminal". A hinge would certainly not be regarded as a "reliable connection".
As far as your door is concerned, is there any single insulated hazardous voltage wiring likely to contact it, or any other single faults which would cause the door to assume a hazardous voltage ? If not, it could be debated that it doesn't require to be grounded. Regards, John Crabb, (Product Safety) , NCR Financial Solutions Group Ltd., Discovery Centre, 3 Fulton Road, Dundee, Scotland, DD2 4SW E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of Ned Devine Sent: 14 November 2003 15:29 To: IEEE EMC/Product Safety (IEEE, EMC/Product Safety) Subject: Grounding Hi, I need some help. I told someone that you can not depend on mechanical contact only (i.e. in this case a door hinge) for protective earth. Even if it passes the test, it would still not be acceptable because it does not meet the construction requirements. He then asked me to show him were it said that in the standard (IEC 60950-1 or IEC 60601-1). I looked and could not find it. Am I just missing it, or is it not in the standards? There is a reference in CSA standards to C22.2 No. 0.4 that has the requirement, but I can not find a similar reference in UL or IEC standards. Ned Devine Program Manager III Entela, Inc. 3033 Madison Ave. SE Grand Rapids, MI 49548 Phone: 616 248 9671 Fax: 616 574 9752 e-mail: ndev...@entela.com www.entela.com 1-800-888-3787 Web: www.entela.com Grand Rapids * Detroit * Boston * Toronto * Taipei 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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
