On Mon, 21 Aug 2017 16:18:31 +0200, Johan Helsingius wrote:

On 21-08-17 14:38, John J Armstrong wrote:

I believe, and I'm sure someone will correct me if I'm wrong, the UK
spec is 230 V +10% -6%, so 253 V to 216 V.

Yes - it was a typical political compromise. UK is 230V +10%/-6%
(or 240V +6%/-10%) and Continental Europe 230V +6%/-10% (or 220V
+10%/-6%), so they get away saying both are nominally 230V...


Absolutely spot on! It was simply a change in the regulations with
regard to the PSU's obligations to maintain end customer supply voltages
agreed between the UK and mainland Europe to allow the use of a 'notional
design voltage' for (essentially) domestic appliances (excluding tungsten
filament lamps which *do* need to be designed for the *actual* local
voltage used in the catchment area of the stores selling such lamps).

The advice note attached to those Quad 405s was simply a reminder that
the supply voltage would still remain 240v with very little danger of the
supply ever being matched to the notional 'Harmonised Supply Voltage' of
230v.

--
Johnny B Good