Reminds me of an amusing argument between a student and a 5 V 1000 A MG set, observed from a safe distance. With best wishes DESIGN IT IN! OOO – Own Opinions Only <http://www.jmwa.demon.co.uk/> www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. From: Ted Eckert [mailto:000007cf6ebeab9d-dmarc-requ...@ieee.org] Sent: Thursday, December 1, 2016 7:11 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] dimension of the stud for PE The test of 2.6.3.4 does get interesting for high current equipment. I have personally run this test only on equipment rated up to 50 A. Even then, it required applying a 100 A test current for 4 minutes. For the 130 A rated product, you would have a test current of 260 A applied for 8 minutes. It may not be easy to find a ground bond tester capable of supplying this current. I did my testing at 100 A using a transformer salvaged from a large scrap uninterruptible power supply. It allowed me to step down a 15 A, 120 V circuit to provide the necessary current at a voltage below the 12 V limit. With this transformer, only a calibrated volt-meter and current-meter were required. One significant issue with this test setup is that additional care must be taken to ensure operator safety. Purchased equipment often has sensors to detect a faulty connection or other error that triggers the equipment to shut off power quickly. You likely won’t have this in equipment you build yourself for such testing. Proper PPE and safety precautions should be used when using any high-power equipment, but it may be necessary to talk with your facility safety staff as home-built equipment doesn’t come with a user manual telling you what is required for safety. The lower voltage used should provide some safety benefit. However, a loose connection that comes in contact with an earth-grounded circuit may result in significant arcing. Even low voltages should be treated with respect when you have high current available. Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer. From: Scott Aldous [mailto:00000220f70c299a-dmarc-requ...@ieee.org] Sent: Thursday, December 1, 2016 9:04 AM To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] dimension of the stud for PE Ken alluded to this before - alternately, 2.6.4.2 allows you to run the test of 2.6.3.4 for constructions that don't meet the requirements of Table 3E. On Wed, Nov 30, 2016 at 8:42 PM, IBM Ken <ibm...@gmail.com <mailto:ibm...@gmail.com> > wrote: Bostjan; That is my understanding; use the table to determine the cross-sectional area (as wire) required, and then ensure that the stud&nut arrangement provides at least triple that contact area. -Ken On Wed, Nov 30, 2016 at 11:33 PM, Boštjan Glavič <bostjan.gla...@siq.si <mailto:bostjan.gla...@siq.si> > wrote: Hi Ken, Thanks. So on short, if table 3B brings requirement of 50mm2 conductor, you would accept terminal if it brings contact area of 150mm2? Best regards, Bostjan From: IBM Ken [mailto:ibm...@gmail.com <mailto:ibm...@gmail.com> ] Sent: Thursday, December 1, 2016 5:24 AM To: Boštjan Glavič <bostjan.gla...@siq.si <mailto:bostjan.gla...@siq.si> > Cc: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] dimension of the stud for PE Hi Bostjan! Can note (c) in Table 3E be applied to this product? I think it is justifiable to extend the protective bonding rules to the PE connection; i.e. to pass the bonding test or to verify via inspection that the PE conductor is "not smaller" than the mains supply - but that's just my opinion. -Ken On Wed, Nov 30, 2016 at 10:53 PM, Boštjan Glavič <bostjan.gla...@siq.si <mailto:bostjan.gla...@siq.si> > wrote: Dear experts I hope there are some experts dealing with IEC 60950-1 standard. We have a product that has rated input current 130A. Unit is intended for permanent connection to mains and provide special terminals for 3 phases and bolt with stud for PE connectio. Question is how should we evaluate dimension of this PE stud according to clause 2.6.4.2, 3.3.5 and table 3E of IEC 60950-1 since values in the table go only up to 80A rated current. Thank you for your support. Best regards, Bostjan - ---------------------------------------------------------------- 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 <mailto: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) <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 <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@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 <mailto: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) <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 <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com> >
-- Scott Aldous | Regulatory Compliance Program Manager | scottald...@google.com <mailto:scottald...@google.com> | 650-253-1994 - ---------------------------------------------------------------- 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 <mailto: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) <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 <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@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 <mailto: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) <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 <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@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>
