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If you are sure you are getting voltage as high as 270V then you must notify the DNO. They are duty bound to do something about it within six months. I advise notifying them by registered mail as I know of cases that have dragged on for years as the date they were notified could not be proven.
 
If you are getting 270V, being 40V over nominal and 17V over the maximum permitted voltage, this should be reported by phone to the DNO as a matter of urgency. They will generally treat such as an emergency and send an operative to site to verify within a couple of hours.

An extreme over-voltage will normally be rectified quickly, whereas the more common 'same time of day' over- and under-voltages recurrences can take a week or so, as the DNO will usually log 2 or 3 days' data at the head to take away and analyse, before tapping down/up at the transformer.

@R-fur where does the six months come from?
 
I wonder if the OP got this sorted. The thread is over 2 months old.

I measured voltage in a house with my multimeter... got 292v !!

Checked again with calibrated tester - 242v....
Had me worried for a minute.
 
Flake 99 vs Fluke 117
Is there much in it?
They're both yellow... :D

A typo and the number 18. That’s the difference.

No, my little multimeter is just a cheap thing from amazon but I’ve had it a good number of years. Digital readout, buzzer continuity tester...
I used it for electronics at college... along with a soldering iron and a little tool kit with screwdrivers and snips.
I keep it in the bottom of the toolbox just for quick continuity tests of fuses, cable identification etc.
 
TonyMitchell
I understand that the regulator puts the six month time limit on voltage complaints, if the DNO does not fix out of tolerance voltages in that time they can be penalised.
I havent checked this recently but a couple of years ago I got involved with a farmer, his wind turbine would not generate as the farm voltage was too high so he was loosing revenue. I got the customer to send a registered letter and the issue was resolved by adjusting the taps on the transformer. The time limit is more relevant for low voltage complaints as the DNO may have to invest time and money upgrading plant. I know of customers fed by a bit of wet string who have argued for years with the DNO.
 
This thread is a bit old, any new from @Alison about a resolution?

All UK electrical equipment should work, by design, from 216-253V as that is the official range of voltages (230V +10% -6%). Outside of that is probably a fault, certainly out of specification, and the electricity supplier needs to find and fix it.
 

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