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Originally the UK mains supply voltage was specified at 240 Volts AC or, more precisely, 240 Volts RMS +/-6%. The alternating current runs at a frequency of 50Hz.
Some time ago, to allow harmonisation across Europe, the specifications were changed to 230 Volts RMS +10%/-6%, also running at a frequency of 50Hz.
Thus the mains supply voltage will remain within European Union norms (standards) even if it varies between an upper limit of 253 Volts and a lower limit of 216.2 Volts. === === === ===
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JordanThese days, in order to comply with EU requirements, the nominal ('named') voltage in the UK is 230 V (rather than 240 V) and it is allowed to vary between -6% and +10%.
The reason for this voltage is that is the standard used in the UK, and it has the advantage of enabling appliances rated up to approximately 3 kW to be connected whereas, in North America, the 120-V system will only support appliances up to approximately 1800 W.
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