> On May 3, 2009, at 2:02 PM, Steve Smith wrote:
>
> There are significant numbers of large UPS that now don't have  
> transformers
> in the input or output these run with a 800v battery centre taped and
> connected to Neutral.... and they hurt if you catch hold of them  
> wrong !!!
>

Do I understand correctly that you said some varieties of UPS use 800V
center tapped batteries ?  What are these batteries built from ?
Gus
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