In the U.K., outlets are fed from a ring rather than a branch. Think of a branch circuit; at the end of the branch, connect the wires back to the breaker box. Thus, each outlet has two sources of current from the breaker. Or, think of a ring from the breaker, with outlets along the ring.
I would guess that our U.K. colleagues would have a better description. Best wishes for the holiday season, Rich > -----Original Message----- > From: Ralph McDiarmid > [mailto:[email protected]] > Sent: Monday, December 12, 2016 11:34 AM > To: [email protected]; [email protected] > Subject: RE: [PSES] British question, about a BS1363 > plug-in power supply > > What's a "ring circuit" ? > > > Ralph McDiarmid > Product Compliance > Engineering > Solar Business > Schneider Electric > > > > > From: Richard Nute [mailto:[email protected]] > Sent: Saturday, December 03, 2016 12:01 PM > To: [email protected] > Subject: Re: [PSES] British question, about a BS1363 > plug-in power supply > > > I understood the fuse in the U.K. plug was to protect the > power cordage. In the U.K., outlets are supplied by a ring > circuit rather than a branch circuit, therefore the power > cord could exceed its ampacity (a U.S.A. term). So, if no > power cord, no need for a fuse in the plug. > I wonder if the power supply has a fuse to protect the > power supply. If so, would this count as the plug fuse? > > Rich > > - ---------------------------------------------------------------- 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]>
