Is there a free on-line reference showing acceptable methods for ground bonding? Screws vs studs? How to properly stack ground bond lugs on to a single stud? Lock washers, star washers, lugs with serrated edges, screws with serrated heads, etc..? Something like this would be most helpful. I recall seeing this kind of information in the back of safety standards we used years ago.
BTW, I have reviewed products from several far east companies who use heavy and thick powder coat paint on their products. Then they'll use a screw into a threaded whole for ground bonding without removing the paint. When I bring this to their attention as a possible non-compliance, they reply, "Test It". Sure enough, it will pass a Ground Bond test at 40 amps for 2 minutes. So it is ok as long as it passes the test? The standard we deal with doesn't say anything about surfaces being paint free, cutting through paint, gas-tight, or what type of lock washers to use. It only says, "Screw connections shall be secured against loosening." It doesn't say anything about stacking ground bond lugs on a stud or if you have to use individual nuts between each lug. The Other Brian -----Original Message----- From: Brian Oconnell [mailto:oconne...@tamuracorp.com] Sent: Monday, March 02, 2015 5:10 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Serrated head screws for grounding/bonding The 'star' washer should be gas-tight seal. If a serrated-headed screw is even less of seal, than higher risk-level indicated. Faulty logic? Anyone else observe failure modes of ground-bond hardware? The CSA Design Manuals (not all standards have a respective D.M.) have drawings and specifications for acceptable materials and combinations of ground bond hardware. Recommended. Brian -----Original Message----- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Monday, March 02, 2015 11:47 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Serrated head screws for grounding/bonding In message <blupr02mb1160acb7f7c87a911caabc6c1...@blupr02mb116.namprd02.prod.outlook .com>, dated Mon, 2 Mar 2015, Brian Oconnell <oconne...@tamuracorp.com> writes: >Saw exactly this happen on flight deck of USS Midway during 1979. While >troubleshooting APD10 radar, the hydraulics guy that was helping me >shorted the 400Hz bus to the box containing the power supply, and a >star washer vaporized because part of the converter was floated. The >star washer was not authorized construction. I was talking about serrated-headed screws, not star washers. - ---------------------------------------------------------------- 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> ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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>
