61010-1 § 4.1 says, "Tests in this standard are TYPE TESTS to be carried out on samples of equipment or parts. Their only purpose is to check that the design and construction ensure conformity with this standard. In addition, *manufacturers shall perform the ROUTINE TESTS of Annex F on 100 % of equipment produced *which has both HAZARDOUS LIVE parts and ACCESSIBLE conductive parts."
61010-1 Annex F, § F2 calls out the "Protective earth" test, also known as the Ground Bond Test, as a required test to be performed on 100% of production. Note the "NOTE" that says, "No value is specified for the test current.". So some NRTL inspectors allow the ground bond test in production to be performed at any reasonable current value, but most will follow the requirements of 6.5.2. I have been doing Product Safety for over 30 years and have worked with UL, CSA, TUV, NEMKO, EOLAS, etc., and all of them require 100% testing of production units to both the Highpot test and the Ground Bond test. Regarding the 100mΩ verses 200mΩ question, all the NRTL inspectors I have worked with require the measured impedance of the Power Cord to be no more than 100mΩ. Note the UL/ANSI/CSA Deviation to 6.5.2.4 that instead of the 100mΩ requirement has a "shall not cause a potential drop of more than 4 V". At a minimum 40 A ground bond test, a 100mΩ impedance would give you a 4V drop. It doesn't say anything about an 8V drop for non-detachable power cords. So NRTLs are going to stick with the 100mΩ across the board, I believe (this is opinion). Hope this information is helpful. The Other Brian On Tue, May 11, 2021 at 11:27 PM Steve Brody <sgbr...@comcast.net> wrote: > So here is my question, or actually two of them: > > First, one of my clients has been told by their 3rd party NRTL that a > ground bond test is required as part of factory/production routine tests, > even though it is not required by 61010-1. I have never run into this > requirement in my work history and I would be interested in hearing if any > of you have. > > Second, just to be sure my interpretation is correct, 61010-1, section > 6.5.2.4, Impedance of protective bonding of plug-connected equipment, in > the fist sentence, it has a limit of 100 mOhms impedance and my read is > that this is for equipment with a power cord that has a plug on one end and > a receptacle on the other. > > Then, in the same section, still under the title of plug-connected > equipment, it says for equipment that has a non-detachable power cord the > limit is 200 mOhms. My interpretation is that plug-connected equipment > with a non-detachable power cord is when the power cord is hard wired to > the unit under test, but still has a plug for mains connection. > > Thoughts? > > Thanks in advance and you can reply here or privately to > stev...@productehsconsulting.com > > > Steve Brody > sgbr...@comcast.net > C - 603 617 9116 > - > ---------------------------------------------------------------- > > 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) <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> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <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>
