Doug -- Thanks for mentioning this!
Yes, I've seen these 30 mA RCDs or RCCBs before, but not an RCBO (confused? Google can explain these acronyms). I've even recommended these for large machinery. The ones we used had adjustable trip points up to 30 mA. Note that I recommended these for MACHINE protection, not PERSONAL protection. The theory was to monitor potential breakdown of the dielectric of the machine by watching the ground leakage current. As I recall, early on we found, before it failed completely, a variable speed fan drive motor with bridged dielectric that was grounding out through a shaft bearing. I'd love to hear what PETE PERKINS has to say about this! Personally, given that North American GFCIs for 120 VAC have trip points of 4-6 mA, I've tended to not like to exceed that number. As I recall, Pete has demonstrated that even 5 mA will be a current to remember if you conduct it. That said, I think Pete told me a while back that the NEC is raising the allowable leakage current for EV chargers to something quite above 5 mA. I'm sure there's a good story behind that. Note also that GFCIs, and as I recall the RCD we were using, could fail silently and thus needed to be tested regularly to ensure continued protection. Mike Sherman > On 02/03/2022 8:23 AM Doug Nix <d...@ieee.org> wrote: > > > Hi Mark, > > I’ve seen mains filters used for 400 V 3 ph. 200A services with leakage > currents close to 30 mA. Consider that RCBOs commonly used outside North > America have a design trip current of 30 mA, so leakage currents above 30 mA > will cause the RCBO to trip. None the less, these large leakage currents can > be startling the first time you see them “in the wild”. > > Doug Nix > d...@ieee.org mailto:d...@ieee.org > +1 (519) 729-5704 > > > > > On 1-Feb-22, at 13:24, Stultz, Mark > <00000f79f2e10e47-dmarc-requ...@listserv.ieee.org > mailto:00000f79f2e10e47-dmarc-requ...@listserv.ieee.org > wrote: > > Hello, > > Is there a hard limit for leakage current for machinery in the EU? > > IEC 60204-1 provides instructions in clause 8.2.8 for “equipment having > > earth leakage currents higher than 10 mA”. This seems quite high so we > > have applied the 3.5 mA limits for class 1 stationary equipment in IEC > > 60335-1. Is there another source for leakage current limits that is > > machinery-specific? There is nothing in the type-C standard for this > > product type. > > > > Thanks, > > > > Mark Stultz > > > > > > - > > ---------------------------------------------------------------- > > > > 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>
