[sdiy] MKS-70 Switch internal transformer from US 117 to UK 240

[Graham Atkins]

On 15 Sep 2010, at 20:13, Ingo Debus wrote:

>
> Am 15.09.2010 um 18:24 schrieb Neil Johnson:
>
>> you wrote:
>>> According to
>>> <http://en.wikipedia.org/wiki/Mains_power_around_the_world>
>>> the mains voltage in the UK is 230 volts.
>>
>> Keep reading....
>>
>> "The system supply voltage remains centred on 240 V."
>
> I did read the whole thing.
> Quote: "Voltage tolerance of 230 V +10%/−6% (216.2 V to 253 V),  
> widened to 230 V ±10% (207 V to 253 V) in 2008." (1st sentence).
> Whatever "centred" means, I always thought it means something like  
> "in the middle of".
> Even applying the older standard you get only 234.6 volts then.

That statement on Wikepedia is misleading, I regularly monitor the  
mains voltage and most of the time it only varies by +/- 1V
IE 239-241V.

This gives a better idea :-

http://www.picotech.com/experiments/mains_voltage/results.html

Graham