John, Appropriate torque is different to set due to various connection mechanism. However you point of double-sided washer is essential. We had a case that the production incorrectly installed the washer upside-down causing the failure in earth continuity test.
Thanks and regards, Scott On Wed, 8 Aug 2018 at 23:03, John Woodgate <[email protected]> wrote: > The screw torque is specified in several standards, but the acceptance > criterion is usually the high-current resistance test. It's really up to > the manufacturer of the product to specify the requirements of the > washer, which must be double-sided so that it doesn't matter which way up > it is installed. > > John Woodgate OOO-Own Opinions Only > J M Woodgate and Associates www.woodjohn.uk > Rayleigh, Essex UK > > On 2018-08-08 14:21, Scott Xe wrote: > > Notice that it is common to use external toothed star washer to > cut through the paint on metal enclosure instead of removing the paint for > earthing. The connection effectiveness may be affected with following > things > > - Sharpness of teeth on washer (some toothed washers are single sided > instead of 2-sided) > - Material of washer > - Paint thickness > - Screw torque > > Is there any standard to give the guidance of minimum requirement for this > purpose? > > Thanks and regards, > > Scott > - > ---------------------------------------------------------------- > > 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 < > [email protected]> > > 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) <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher <[email protected]> > David Heald <[email protected]> > > > - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
