On Mon, Mar 16, 2009 at 5:10 AM, Rikard Bosnjakovic
<rikard.bosnjakovic@gmail.com> wrote:
> On Sun, Mar 15, 2009 at 22:14, cdb <colin@btech-online.co.uk> wrote:
>
>> The only problem with having earthed workbenches and antistatic mats
>> is when using an isolation transformer to power devices.
>
> Would you care to elaborate?
>
> I could take a guess, but I'd rather not.

I think there could be a huge potential difference between ground and
the negative terminal.
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