Re: [Emc-users] Servo PSU

[Steve B. <st...@pi...>]

On Tue, 6 Sep 2011 23:30:11 +0100, you wrote:

>On 6 September 2011 23:14, Steve Blackmore <st...@pi...> wrote:
>
>> I've regularly seen much higher than a few volts. I think it depends a
>> lot on location and local wiring condition/type and ground conditions.
>
>I am not sure I want to think to hard about this, because then I will
>end up getting bogged down in whether my installation is TN-S,
>TN-C-S, TT or TN-T and whether I should do away with the exported
>earth on the SWA, put in a spike and go TT locally.

They seem to have stopped installing ground spikes these days. Cross
bonding to water or gas pipes is no longer a good earth path (plastic
pipes) and the underground cables are no longer lead coated so your
earth now relies on how good the earth is inside your mains supply. The
further from the substation you are, the worse it seems to get :(

Put a ground spike in additionally as a belt and braces measure if you
can.

Steve Blackmore
--