In message <497b1c9c.1c078e0a.65f9.7...@mx.google.com>, dated Sat, 24 Jan 2009, Scott Xe <scott...@gmail.com> writes:
>I am unsure if the mains supply companies follow a July 2005 DTI note >"Electrical Supply Tolerances and Electrical Appliance Safety" points >out that "Though the electrical supply is quoted as being over a range, >it is preferable for power distribution companies to keep supply >voltages as high as possible to minimise current in the supply network >and hence delaying the need to make improvements in the supply >infrastructure to increase current handling capability." I asked some supply industry experts about that. They believe that the paper is incorrect when it states: "Though the electrical supply is quoted as being over a range, it is preferable for power distribution companies to keep supply voltages as high as possible to minimise current in the supply network and hence delaying the need to make improvements to the supply infrastructure to increase the current handling capability." The reason why Distributors keep the voltage near the upper range is not to reduce current, but to ensure that the networks remain compliant (with the Energy Supply Quality Control Regulations for voltage tolerance) during periods of maximum load and therefore maximum voltage drop. However, when setting the voltage, care is taken to make sure that under no load conditions the voltage will not exceed the upper voltage limit (253V at LV). -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
