Set Square wrote:

Whereas it sits at just under 240v for most of the time, it has been showing
quite a lot of variation - this morning getting up to about 248v for a
while.

What are the acceptable limits? Is the voltage controlled locally in each

Depends on what you mean by acceptable... and to who? ;-)

It ought to be no more than 230 + 10% or less than 230 - 6%, so
technically yours is borderline out of spec.

sub-station - or does that just transform it down in a fixed ratio? The

IIUC the transformers have multiple taps that allow a range of voltages
to be preselected. The supplier presumably choosing an appropriate tap
based on the length and average load of the circuit.



--
Cheers,

John.

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