I too can vouch for doing the Bonding test to a few hundred amps using a Sorensen DC supply (and calibrated V and I meters and stopwatch...)
-Ken On Thu, Dec 1, 2016 at 5:07 PM, Scott Aldous < [email protected]> wrote: > I've done this test at several hundred amps before (not to 60950-1, but > similar). I used an old Sorensen > <http://www.programmablepower.com/brands/sorensen.htm> DC power supply > (low voltage, high current), with external calibrated measurement for both > current and voltage drop. Care must also be taken in connecting the power > supply to the EUT to make sure it is low resistance. > > On Thu, Dec 1, 2016 at 1:52 PM, John Woodgate <[email protected]> > wrote: > >> 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 >> >> www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England >> >> >> >> Sylvae in aeternum manent. >> >> >> >> *From:* Ted Eckert [mailto:[email protected]] >> *Sent:* Thursday, December 1, 2016 7:11 PM >> >> *To:* [email protected] >> *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:[email protected] >> <[email protected]>] >> *Sent:* Thursday, December 1, 2016 9:04 AM >> *To:* [email protected] >> *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 <[email protected]> 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 <[email protected]> >> 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:[email protected]] >> *Sent:* Thursday, December 1, 2016 5:24 AM >> *To:* Boštjan Glavič <[email protected]> >> *Cc:* [email protected] >> *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 <[email protected]> >> 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 < >> [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) <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]> >> >> >> >> >> >> -- >> >> Scott Aldous | Regulatory Compliance Program Manager | >> [email protected] | 650-253-1994 <(650)%20253-1994> >> >> >> >> - >> ---------------------------------------------------------------- >> >> 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 < >> [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) <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) <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]> >> > > > > -- > Scott Aldous | Regulatory Compliance Program Manager | scottaldous@google. > com | 650-253-1994 <(650)%20253-1994> > > - > ---------------------------------------------------------------- > > 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 < > [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]>
