What is the currently officially valid tolerance of the mains voltage 230V in our electrical network?

I remember that in times of 220V, tol was allowed. +/- 10%. After switching to 230V, this no longer applies - what are the current limits? And for the 'witnesses' - from which date did the change from 220 to 230V take place? Thank you.
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1 Answer

Answer :

The normalized rated voltage Un for the public low voltage network is Un = 230 V between phase and node. The voltage deviation should not exceed ± 10%. Under normal operating conditions, during each week, 95% of the average rms values ​​of the supply voltage at measuring intervals of 10 minutes must be in the range of Un ± 10%. All average rms values ​​of the supply voltage in measuring intervals of 10 minutes must be in the range Un + 10% / -15%. Predistribuce, as, maintains the supply voltage according to the valid requirements before 1 January 2008, ie. with deviations of + 6% - 10%. It thus adapts the supply voltage level more to the requirements of the customer's supply equipment. The change I think was just 1,1,2008        
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