[Gllug] OT: Merging UPS outputs

[Ken Smith]

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
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