On 07/08/17 23:17, Dave Howorth wrote:
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.). Do you or any other properties nearby and on the same phase have solar
On Mon, 7 Aug 2017 18:43:06 +0100 Paul Groves
wrote: panels (PV)? They will cause the mains voltage to be higher than normal. Never though of that. Although the UK voltage under law is 230V +- 5% for no more than 24 hours +10% maximum (so 253 maximum).
They are getting around this by setting the voltage back to 240.0 on a timer in the evenings. It is then back to 253V withing the hour. One time I saw it up to 268. This cannot be solar panels in the dark of course. They have over doubled the amount of properties in my village over the last few years but I have not seen any works to install another power feed. So logically if you want to draw more power you have to increase either the thickness of the cable (or number of cables) or the voltage. So personally I believe this is likely the cause of the high voltage. Although a lot of electronics in the UK are only made to stand 250V still (which is why I think everywhere keeps catching fire lately). Also the fact that there is no Bristish Standard for electrical goods any more and the CE electrical mark is self-regulated (which in my opinion in as good as no regulation).
The voltage limits are Europe-wide, incidentally. They were 'harmonised' a while ago.
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