On Tue, 19 Mar 2019 19:39:28 -0000
Terry Casey wrote:

In article ,
says...

My understanding is that the supply voltage has not changed, only
the nominal voltage. Someone will have the figures but I was told
the narrow band round our 240V fits inside the wider band round
230V.

The UK supply voltage used to be 240V ±6%, which is 226V -
254V

European voltage was 220V. Assuming the same ±6% tolerance was
used, it could vary from 207V to 233V.

Europewide it is now 230V ±15% (I think) which is 200V - 264V.

A 10% tolerance would be better: 210V - 253V, so perhaps my
memory is playing tricks on me.

Antway, as you say, no change the supply volage change is/was
necessary either side of the Channel.

The last time I looked we were still running 240V and most of mainland
Europe 220V, we just rewrote the tolerances to harmonise the different
supplies.

So French nominal 230V is -10% +6% (207V - 244V) and English is 230V -6%
+10% (216V €“ 253V)