Actually Edison Illuminating Company of America installed the first electric lights on the UK railway in the 1920s at Fenchurch Street (London) so they used what they were experienced with ... and because its safer.
The UK railway hasn't changed it since. From: Ted Eckert [mailto:[email protected]] Sent: 04 July 2012 23:59 To: [email protected] Subject: Re: Interview Questions 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]]<mailto:[mailto:[email protected]]> Sent: Wednesday, July 04, 2012 1:50 PM To: [email protected]<mailto:[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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