Nick Good points - I would only say that I was mainly addressing Jim's original question about the rating of the double-socket itself in respect of BS1363, and not really the wider issue of Socket/cable/MCB coordination.
Regards John From: "Nick Williams" <[email protected]> To: "John Allen" <[email protected]> Cc: "Colgan, Christopher [Harman Pro Group UK]" <[email protected]>; <[email protected]> Sent: Tuesday, April 05, 2005 10:54 AM Subject: Re: UK Domestic Electrical Socket Outputs > With all due respect to everyone who has commented so far, I think > you have all missed a fundamental point (although John got quite > close to it). > > So long as the MCB (or fuse) in the fuseboard is correctly specified > for the cable(s) which connects it to the socket, then the rating of > the socket itself is largely irrelevant. After all, you can have more > than one double gang socket on a ring main, and the total load can be > anything up to the 30A rating of the MCB. > > A ring main is rated at 30A despite the fact that it only used 2.5mm > sq cable because two cables (=5mm sq) are used. > > So, in practice, the total load on a double gang socket can be 2 x > 13A = 26A on a ring main, but only 15A on a spur. The limiting factor > in the first case is the fusing of the plugs, in the second case it's > the fusing of the fixed wiring. > > It's a question of what is the weakest link in the chain. > > Nick. > > > > At 6:02 pm +0100 4/4/05, John Allen wrote: > >Chris, Jim > > > >Just taken a look at BS 1363-2: 1995, which is the part dealing with > >sockets - the results are interesting! > > > >Here are the most relevant bits (with an awful lot left out!) > > > <snip> > > 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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
