[sdiy] A transformer question.

Tom Wiltshire tom at electricdruid.net
Tue Nov 4 12:55:31 CET 2008

Hi Tom,

UK mains voltage got standardised to the rest of Europe in the '90s,  
I think. It used to be 240V, but is now 230V.


According to the link above, they changed the spec from 240V +/-6% to  
230V +/-10%, which means that 240V is still in spec.


On 3 Nov 2008, at 20:32, Tom Bugs wrote:

> Hi,
> A quick question about twin primary transformers for which I've not  
> been able to find answers...
> If there are twin 115v primaries.. (ie series for 230v and parallel  
> for 115v)
> - should this be able to cover Euro vs UK ranges of c.220v to 240v?
> - and would it cover US 120vAC and 110vAC in places like Cuba?
> - how can one deal with the 100v in Japan (other than replacing the  
> trafo with a different spec one?)
> I'd guess there's a bit more to it too - dependent on current draw,  
> trafo type & spec, etc..
> Any help greatly appreciated!
> Ta,
> Tom
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