I think Ken is on the right track. Railroad signally and portable equipment both represent areas where there is a higher risk of exposed connections. Receiving a shock from 110V is unpleasant, but it is less likely to lead to significant harm than a 240 V shock. I've contacted 110V a number of times and it seems to have had no ill effects other than starting e-mail messages with bad puns.
Ted Eckert Compliance Engineer Microsoft Corporation [email protected]<mailto:[email protected]> The opinions expressed are my own and do not necessarily reflect those of my employer. From: IBM Ken [mailto:[email protected]] Sent: Wednesday, July 04, 2012 1:50 PM To: [email protected] Subject: Re: Interview Questions It's safer! :-P :-D On Wed, Jul 4, 2012 at 12:28 PM, Scott Xe <[email protected]<mailto:[email protected]>> wrote: Hi Andy, Is there any particular reasons to have 110 Vac for railway signalling system in a 230/240 Vac country? Scott On 4/7/12 3:10 PM, "Andrew McCallum" <[email protected]<mailto:[email protected]>> wrote: > The UK railway signalling system all runs at 110 V AC 50 HZ > Andy > > -----Original Message----- > From: John Woodgate > [mailto:[email protected]<mailto:[email protected]>] > Sent: 03 July 2012 21:17 > To: [email protected]<mailto:[email protected]> > Subject: Re: Interview Questions > > In message > <CAKEabA3B=iqyzpyjzmb5tjdewp+eowdq40fu9dh88oah6a1...@mail.gmail.com<mailto:iqyzpyjzmb5tjdewp%[email protected]>>, > dated Tue, 3 Jul 2012, IBM Ken <[email protected]<mailto:[email protected]>> > writes: > >> PS: Who operates at 110VAC 50Hz? > > Portable equipment used on construction sites; it's actually 55-0-55, with the > centre grounded. > -- > OOO - Own Opinions Only. Try > www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> and > www.isce.org.uk<http://www.isce.org.uk/> Instead > of saying that the government is doing too little, too late or too much, too > early, say they've got is exactly right, thus throwing them into total > confusion. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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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://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 <[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://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 <[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://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 <[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://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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
