On Fri, 03 Sep 2004 12:02:46 +0100, Chris Newport
wrote:
This is typical of an intermittent overload.

I would suspect a faulty electric motor starting somewhere
pulling a very heavy starting current.

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I guess it's a possibility but is not showing up on the panel meters
as far as I can see. My air conditioning compressors and the
circulation pump all have high starting loads but they were running
steady state at the time.