On Fri, 21 Jun 2002 12:41:21 -0500, you wrote:

>If you want to run off of 277VAC and you only have 230V transformers
>available, get a 230V to 48V transformer and wire it as a stepdown
>autotransformer.  230V + 48V =3D 277V aprox. so you can input 277 to =
both
>windings in series (correct phasing) and get 230 out, everything will be=
 in
>spec.  Ideally you would get a transformer with both 48V and 12.6V =
windings
>so you don't need two chunks of iron.
,,and you need to have the full mains spec isolation between the 48
and 12.6v windings, which will often not be the case for standard
transformers, which only have full isolation between primary and
secondary, not between secondaries..

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