Until today, I thought the European electricity network was 230 ± 6%. I measured my supply as 250V, which surprised me as that's 6V above 244V.
I checked, and the specification is actually 230 +10% / -6% (so my supply is below the 253V maximum).
However, many of my devices (Laptop Charger, iMac, Phone charger, etc) have a range of 100-240V written on the transformer.
Is any damage to these devices possible?