[Gllug] OT: Merging UPS outputs

[Ken Smith]

> -----Original Message-----
> From: gllug-bounces at gllug.org.uk [mailto:gllug-bounces at gllug.org.uk] On
> Behalf Of Ken Smith
> Sent: 22 August 2005 08:56
> To: Greater London Linux User Group
> Subject: Re: [Gllug] OT: Merging UPS outputs
> 
> Chris Bell wrote:
> 
> >   So what do you get down the cable, (assumed AC volts)
> >
> >-55, 0, +55, 230
> >
> >-110, 0, +100
> >
> >
> >
> 
>  From what  I recall from when I lived in Canada many domestic supplies
> there were effectively 230V center tapped. IE: One phase of the public 3
> phase supply from a centre tapped winding.  So the supply would be on
> three wires with a neutral and two 180 degree (not 120 degrees as you
> might expect) out of phase 115 supplies. The live to live would be 230 V
> for large capacity appliances like dryers and air conditioners. I'm not
> sure how the two 115 supplies were are actually normally used for the
> 115 V outlets. I guess one for one floor of a house and the other for
> another floor. The 230V 60Hz supply was good for most UK bits that
> didn't mind 60Hz but couldn't handle the 115V supply. My UK PAL VCR
> actually worked fine on 115V 60Hz even though it says 240V 50Hz on the
> back. (Friends sent me tapes so I could get to see home TV.) I also came
> across 600V 3 phase industrial supplies there - eeek!
> 
> Radial wiring is the norm in North America. Our ring main idea seems to
> be unique to the UK and other BS1363 places were we have had historical
> influence - such as S Ireland and Ghana and I think Iraq and probably
> elsewhere.
> 
> Ken


An afterthought. 

North American 115V outlets are rated at 16A. But they really don't seem
tough enough to carry that. So the maximum you could get from them is 1.8KW.
That’s fine for most things but their kettles take ages to boil (generally
1.2KW) and the plug is usually warm to touch after that! Their toasters take
ages too.

Different - but liveable with...

Ken
 

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