I am sure our military folks have run across this issue before! Perhaps you can look into some of the publicly available documents ??
On Tue, Feb 15, 2022 at 5:54 PM Richard Nute <ri...@ieee.org> wrote: > * This message originated outside of DISH and was sent by: ri...@ieee.org > <ri...@ieee.org> * > ------------------------------ > > > > Hello James: > > > > As for resistance of the connection, I doubt that there is significant > difference. I have tested both with a high-current-sourcing milliohmeter. > You can repeat the test and see if there is a difference in the > resistance. (Even a loose connection will still pass the high current > test.) > > > > A star washer is more likely to penetrate paint. However, a stud mounted > in a panel is independent of paint. So, a lockwasher simply locks the nut > to the stud and has little to no effect on the resistance of the > connection. > > > > Best regards, > > Rich > > > > > > > > *From:* James Pawson (U3C) <ja...@unit3compliance.co.uk> > *Sent:* Tuesday, February 15, 2022 7:34 AM > *To:* EMC-PSTC@LISTSERV.IEEE.ORG > *Subject:* [PSES] Earthing -- Star vs Spring/Split Washers > > > > Hello all, > > > > I’ve given myself a regular internet headache trying to understand the > relative merits of spring vs star washers for use on an earth stud for > protective earthing purposes. > > > > What is the conventional wisdom and justification? I know I can trust you > folks to be above a simple “we’ve always done it this way” > > > > Can anyone point me towards any citable references or standards covering > this subject? > > > > I promise I will write a blog post to pull the information together for > future confused generations. > > > > Thanks and all the best, > > James > > > > > > James Pawson > > The EMC Problem Solver > > > > *Unit 3 Compliance Ltd* > > *EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : > Consultancy* > > > > www.unit3compliance.co.uk > <http://www.unit3compliance.co.uk/> > | ja...@unit3compliance.co.uk > > +44(0)1274 911747 | +44(0)7811 139957 > > 2 Wellington Business Park, New Lane, Bradford, BD4 8AL > > Registered in England and Wales # 10574298 > > > > > > > - > ---------------------------------------------------------------- > > 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 > <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/ > <http://product-compliance.oc.ieee.org/> > can be used for graphics (in well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > <http://www.ieee-pses.org/> > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > <http://www.ieee-pses.org/listrules.html> > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > -- Charles Grasso Dish Technologies (c) 303-204-2974 (h) 303-317-5530 (e ) charles.gra...@dish.com (e2) chasgra...@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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
