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

Ingo Debus igg.debus at t-online.de
Wed Sep 15 21:13:43 CEST 2010


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.

Then there's that footnote with a link to "Lighting Industry  
Federation Ltd (2001) LIF Technical Statement No. 15". That link  
takes you to a lot of Technical Statements, but No. 15 is missing...

> Note that we played games with the tolerances to "allow" us to claim
> compliance with EU directives

Same thing here in Germany: we switched from 220 volts to 230 volts  
+6%/-10% and then to 230 volts +/-10%.
But hey, the switch to 230 volts was done in the mid-eighties of the  
past century...

Here's another Wikipedia entry, pretty unambiguous:
<http://en.wikipedia.org/wiki/IEC_60038

Ingo


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