like Dave said 253V is still classed as 230V "In the United Kingdom, the standard voltage for single-phase electricity supply is 230 volts. The allowable voltage tolerance range is typically 216.2 volts to 253 volts, this is -6% to +10%"254V supply
half right minus 6% plus 10%plus or minus 10%. 230V is 253v max.
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