Wrote: < Can someone point me to a resource which gives typical maximum fault currents available from a domestic electrical supply in the UK?
BS 7671 discusses the issue and gives methods for calculation of temperature rise under fault conditions, as well as maximum fault clearing times, but it doesn't appear to give any numbers for the fault currents. I have no feel for what sort of numbers are actually involved although I suspect that it will be in the kA range.> I don't have the calcs to hand, but any domestic breaker is usually marked as having 9kA breaking capacity, and 3ph bus bar systems, e.g. motor conrol centres, will have 80kA breaking capacity. A BS1362 13A fuse used in UK mains plugs has a breaking capacity of 6kA. That gives the scale of things. Enjoy! Chris Duprés *******************Internet Email Confidentiality Footer******************* The contents of this e-mail message (including any attachments hereto) are confidential to and are intended to be conveyed for the use of the recipient to whom it is addressed only. If you receive this transmission in error, please notify the sender of this immediately and delete the message >from your system. Any distribution, reproduction or use of this message by someone other than recipient is not authorized and may be unlawful. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
