Hi John:
The grounding circuit need only carry the maximum fault current, which would be in the range of 13 to 20 amps. Testing at 5 times the maximum fault current is likely to damage the circuit by itself, let alone finding a manufacturing error. Eyeball inspection of the grounding circuit probably is sufficient. Best regards, Rich From: John Woodgate <j...@woodjohn.uk> Sent: Wednesday, May 22, 2019 9:44 AM To: ri...@ieee.org; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] GB or GC?....that is the question.... Thanks, Richard, for the true facts. However, we can look at the facts another way. Since the test is passed, provided the fault does not get worse, the product remains safe. It's not an ideal situation, but it seems that something like a 100 A test would be required in order to detect a fault of either type described. On 2019-05-22 17:28, Richard Nute wrote: 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 - ---------------------------------------------------------------- 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>
