Hi Regan and all:
As I’m sure you know by now, I subscribe to engineering principles, not to the various safety standards. Some years ago, I did some tests to determine the better production-line test for the grounding circuit. I documented my findings in an article in the Product Safety Newsletter, Volume 10, Number 2. Neither the high-current test nor the ohmmeter (or continuity) test are likely to find broken strands or loose connections. I have attached my article. Best regards, Rich From: Regan Arndt <[email protected]> Sent: Friday, May 17, 2019 12:08 PM To: [email protected] Subject: [PSES] GB or GC?....that is the question.... Hello members, I tried to search my EMC-PSTC archives (to no avail) regarding a debate of using either ground bond (let's assume 25A for this discussion) or ground continuity (resistance measured < 0.1 ohm for this discussion) testing during production. Therefore, I would like to bring the topic up (again?) and get your professional opinion on these tests. (Side note: Omnia has put out a brochure recently promoting the use of ground bond test in addition to ground continuity during production, but I am a little skeptical.) I am a proponent for the ground continuity test during production for several reasons: 1. It’s safe to conduct, especially for production staff 2. Less harmful to the equipment 3. Intent is to verify the ground path is ‘secure’. And I am an opponent to the ground bond test during production for several reasons: 1. Dangerous to conduct. Need astute production personnel that know what they are doing. 2. I consider this a type test and ‘somewhat’ damaging/stressful….(Yes, can be debated)… Yes, the ground bond test is useful and a good indicator for determining the ampacity integrity of cables/connectors but, in my opinion, it should be reserved for type testing only. I feel that there is no reason to do the ground bond test during production if the manufacture controls their components in purchasing/design via an ECO process, etc., thus the ground continuity test is thereby sufficient. If one have no component control process, then, yes, GB is a good idea. Note that IEC 61010-1 Annex F (Routine tests) also specifies the ground continuity test (and not a ground bond test)....... but also take note that it does say the value for current is not specified. F.2 Protective earth A continuity test is made between the earth pin of the appliance inlet or the MAINS plug of plug-connected equipment, or the PROTECTIVE CONDUCTOR TERMINAL of PERMANENTLY CONNECTED EQUIPMENT on the one side, and all ACCESSIBLE conductive parts which are required by 6.5.2 to be connected to the PROTECTIVE CONDUCTOR TERMINAL on the other side. NOTE No value is specified for the test current. Your reply is greatly appreciated. Thanks in advance. Regan Arndt - ---------------------------------------------------------------- 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] <mailto:[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] <mailto:[email protected]> > Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[email protected] <mailto:[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]>
97v10n2_tech_spkg.pdf
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