home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!newsflash.concordia.ca!mizar.cc.umanitoba.ca!bison!sys6626!inqmind!bills
- From: bills@inqmind.bison.mb.ca (Bill Shymanski)
- Newsgroups: sci.electronics
- Subject: Re: 110/220 V AC why ?
- Message-ID: <JDZLwB1w165w@inqmind.bison.mb.ca>
- Date: Wed, 30 Dec 92 12:47:18 CST
- References: <C01GMv.K1u@zoo.toronto.edu>
- Organization: The Inquiring Mind BBS 1 204 488-1607
- Lines: 33
-
- henry@zoo.toronto.edu (Henry Spencer) writes:
-
- > In article <1992Dec29.160117.12068@cbfsb.cb.att.com> medha@cbnewsg.cb.att.com
- > > I am curious to know why some countries have 110V AC supply
- > >and some 220V AC as their main line voltage ?
- >
- > Historical accident, mostly. As others have pointed out, there are other
- > voltages in use too. The higher voltages have both advantages and
- > disadvantages, and electrical power systems evolved in parallel so there
- > wasn't a single pioneer that everyone else followed.
- >
- > >... Is there
- > >any talk of standardizing this like SI syatem of measurement ?
- >
- > Not a prayer. The costs of switching would be astronomical, all the more
- > so because you can't convert one appliance at a time. The benefits don't
- > justify the pain.
- > --
-
- You will recall back in the early '50s, Ontario Hydro conducted a
- roundup and exchange program when they collected all the 25 Hz
- motor-driven appliances and modified or replaced them with 60 Hz
- equipment. This cost a fortune at the time, but was a Good Thing
- overall because it lead to an all-60-Hz network. I understand that a
- small amount of 25 Hz generation was in use till the last 3 or 4 years,
- for a couple of industrial customers - for those applications, it wasn't
- too cost-effective to convert them to 60 Hz and so they kept on with 25
- Hz power till the late '80s.
-
- Bill
-
- bills@inqmind.bison.mb.ca
- The Inquiring Mind BBS, Winnipeg, Manitoba 204 488-1607
-