Lauren & Brian,
Be careful with considering a test. The source must have a SSCurrent equal to (or greater than) the largest SCCR component (sounds like the 200kA fuse from your description). This level of available current is not found in your usual lab setup. I have seen disastrous test results when the entire system is properly tested even tho it was claimed to be sufficient because of an earlier test at a lower SSCR setup. :>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO Box 1067 Albany, ORe 97321-0413 503/452-1201 IEEE Life Fellow IEEE PSES 2020 Distinguished Lecturer <mailto:[email protected]> [email protected] Entropy ain’t what it used to be From: [email protected] <[email protected]> Sent: Friday, October 30, 2020 9:36 AM To: [email protected] Subject: Re: [PSES] Short Circuit Current Rating (SCCR) Hi Brian, UL 508A Supplement SB has a method for this. Also the www.semi.org <http://www.semi.org> standard SEMI S22 has a method in one of it’s ‘Related Information’ sections. The SEMI standard RI section includes a reprint of an SCCR guide from Bussmann. The link S22 provides no longer works (it looks like bussmann was acquired by Cooper was acquired by Eaton since then), but it looks like Eaton has some useful guidance in a big guide they have for electrical protection in general (probably with a generous dose of Eaton products) at http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/technical-literature/bus-ele-an-3002-spd.pdf Best Regards, -Lauren From: Brian Kunde <[email protected] <mailto:[email protected]> > Sent: Friday, October 30, 2020 8:55 AM To: [email protected] <mailto:[email protected]> Subject: [PSES] Short Circuit Current Rating (SCCR) 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 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] <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] <mailto:[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] <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]>
