From: John Woodgate
Subject: Re: Strange failure mode in switchmode power supplies: Followup
Date: Sun, 22 Sep 2002 09:07:01 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sun, 22 Sep 2002 11:23:58 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Tony Williams
wrote (in <email@example.com.
uk>) about 'Strange failure mode in switchmode power supplies:
Followup', on Sun, 22 Sep 2002:
>In article <$iF6uCAO5Qj9Ewxp@jmwa.demon.co.uk>,
> John Woodgate wrote:
>> The service cables are coaxial in later installations but there are many
>> indeed that are not: 2 cores and the armour is the supplier's
> A few of the houses around here have a single
> thick feeder cable, but most are still the
> old two-wire feed, with the Neutral presumably
> earthed at the stepdown transformer.
My comments refer to underground distribution. Overhead distribution
with two-wire feed are probably PME (Protective Multiple Earthing)
systems now, where the neutral is earthed at several points within the
distribution system, as opposed to at each service entrance, the
practice in most other countries.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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