Re: [PSES] Lock washers for bolted bonding connections

[Doug Powell]

To my knowledge, IEC-based  standards do not specify this. If there is a requirement, possibly a local governing entity has required this.  Sometimes the national code of a EU member country imposes additional requirements.   Continue to challenge the source of these statements, it could be nothing more than an individual's personal preference.   Doug  From: Douglas Nix Sent: Thursday, July 18, 2013 7:35 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Reply To: Douglas Nix Subject: [PSES] Lock washers for bolted bonding connections Colleagues, Recently I had a conversation with a German colleague who told me that 'star washers', commonly used for making vibration resistant bonding connections in North America, are not permitted for this use in Germany. Only lock washers meeting DIN 6796, commonly called 'Belleville' washers, are accepted. When I pressed him for a standard or a regulation that made that requirement, he was not able to provide one. I know from experience that Bellville washers are superior in performance, and the serrated version will definitely cut through any surface coating to the bare metal substrate. Star washers can usually do this, but they do not provide as uniform a tension on the bolt as a Belleville. Any comments on the regulatory or standards-based source for this requirement? Sent from my iPhone Doug Nix d...@complianceinsight.com Mobile: (519) 729-5704 Office:(519) 650-4753 Fax: (519) 653-1318 - ---------------------------------------------------------------- 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> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.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> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>