Japan electrical power?

Wed May 11 19:10:31 UTC 2011

> From nanog-bounces+bonomi=mail.r-bonomi.com at nanog.org  Wed May 11 13:22:18 2011
> Date: Wed, 11 May 2011 14:21:30 -0400
> Subject: Re: Japan electrical power?
> From: Jay Nakamura <zeusdadog at gmail.com>
> To: Robert Boyle <robert at tellurian.com>
> Cc: nanog at nanog.org
>
> On May 11, 2011 10:09 AM, "Robert Boyle" <robert at tellurian.com> wrote:
> >
> > Hello,
> > I know voltage varies from town to town and prefecture to prefecture.
>
> No, it doesn't.  Japan has two systems, both 100v, western Japan has 60Hz,
> eastern Japan has 50Hz.

'Nominal' voltage, that is.  with relatively poor regulation.  'local'
variation +/-10% (or more) is the norm.  Handling +/-15% will cover 
practically all 'routine' volatage excursions.  If I was designing, I'd
spec for at least 25%, and probably "30% plus", variance.