Hi Brian, I agree with Doug Powell, but short of doing a complete coordination study, one thing in your message jumped out at me:
> "...a 3 phase motor-driven industrial device. It draws less than 8 amps at > 230V. Internal to the device, we have three "CC" type fuses with a SCCR of > 200KA. However, ahead of that we have a lockout/tagout disconnect device > that is only rated 10KA SCCR.” The 10 kA disconnect will limit your SCCR to 10 kA, regardless of the CC fuses downstream. You installation instructions need to tell the installer that your system is limited to 10 kA so that they can select the correct O/C protection at the source to protect your product. If you want to take advantage of the current limitation of those CC fuses, you need a 200 kA rated fused disconnect that will accept the CC fuses. -- Doug Nix [email protected] +1 (519) 729-5704 "What sets a canoeing expedition apart is that it purifies you more rapidly and inescapably than any other. ● Travel a thousand miles by train and you are a brute; ● Pedal five hundred miles on a bicycle and you remain basically bourgeois; ● Paddle a hundred in a canoe and you are already a child of nature." Pierre Elliot Trudeau > On 30-Oct-20, at 09:54, Brian Kunde <[email protected]> wrote: > > Greetings to all. I hope this finds you well. > > Once again the subject of SCCR has come up. I have struggled for years to > find a document or someone who can explain this to me. The bottom line is I > need to know how I would determine the SCCR for my product. In one case in > particular I am currently working on, it is a 3 phase motor-driven industrial > device. It draws less than 8 amps at 230V. Internal to the device, we have > three "CC" type fuses with a SCCR of 200KA. However, ahead of that we have a > lockout/tagout disconnect device that is only rated 10KA SCCR. > > How exactly can I determine the SCCR of my device? > > Thank you all. > > The Other Brian > - > ---------------------------------------------------------------- > 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] <mailto:[email protected]>> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > <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/ > <http://product-compliance.oc.ieee.org/> can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ <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 > <http://www.ieee-pses.org/listrules.html> > For help, send mail to the list administrators: > Scott Douglas <[email protected] <mailto:[email protected]>> > Mike Cantwell <[email protected] <mailto:[email protected]>> > > For policy questions, send mail to: > Jim Bacher <[email protected] <mailto:[email protected]>> > David Heald <[email protected] <mailto:[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]>
