On 07/08/17 22:02, Carlos E. R. wrote:
On 2017-08-07 19:43, Paul Groves wrote:
So unless something is causing some other type of interference on the earth? Out earth connection is via the Neutral cable coming into the building. I don't understand this sentence. You don't have a separate ground wire, instead you use the neutral cable?
The building doesn't have it's own ground pole, a metal rod inserted into the earth?
I'm not familiar with the British electricity code. I guess it will be different! :-p I would post a scan of the page detailing this but it will not let me attach an image here.
You can have one of 3 types of earth in the UK as far as I understand. We have the first type where the metal shielding around the live (or phase) is used as ground/neutral. Or there is sometimes a separate shared neutral/ground cable. Or if none of the above a metal ground spike in the ground under the building (this is rare in the UK) for houses).
We have had a problem lately where our voltage is always unusually high, hovering between 248V and 253V which is the absolute legal maximum they are allowed to supply in the UK. (They insist they are not providing this voltage but 3 UPSs and 4 volt-meteres would not all be false readings.). They need to measure it themselves with their own equipment, and I suppose they are very hard to convince to do the measurement. We have asked but they ignored us. I have got 6 months of the voltage logged in an sql database. I am planning to generate a graph from this so we can claim back the costs. Perhaps this could be causing the problem? Dunno.
I have yet to transport the system to a different site to test it. If that worked, it would nail the problem, certainly.
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