[Gllug] OT: Merging UPS outputs

[Alain Williams]

On Sun, Aug 21, 2005 at 11:39:10AM +0100, Chris Hunter wrote:
> David Damerell wrote:
> 
> >On Thursday, 18 Aug 2005, Richard Jones wrote:
> > 
> >
> >>Why do we run 240 VAC through our houses anyway?  Surely all of these
> >>transformers and regulators must waste huge amounts of energy.
> >>   
> >>
> >
> >Er, what would you suggest instead?
> >
> > 
> >
> 55 Volts either side of earth is quite reasonable (like site power 
> tools, and much of the Americas).  It's generally much safer, though 
> heavier current devices usually require higher supply voltages - it's 
> not uncommon for most domestic supplies to be 110V (55V either side of 
> earth) with an additional 230V supply for washing machines, air 
> conditioners and the like.

Which means more complicated/expensive dual voltage supplies.
In the UK machinery that is likely to (accidentally) expose a user to the
supply (ie building sites) usually runs at 110V --- which is why you see
the small yellow transformer boxes in such places.

-- 
Alain Williams
Parliament Hill Computers Ltd.
Linux Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/

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