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A unit of electrical equipment is designed for operation at a certain voltage - or within a certain range of voltages - i.e for 5 volts, 12 volts, 120 volts. 220 to 240 volts. Originally the UK household alternating current supply voltage was specified at 240 volts or, more precisely, 240 volts RMS +/-6%, running 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. So, because 208 volts is lower than the minimum range of a standard 230 volt 50 Hz supply, it is not safe to assume that any equipment which has a rating plate saying that it should be powered from a 208 volts ac supply can be used on a 230V ac supply without causing any damage. Such damage might affect the equipment itself or its surroundings or its "human" users... If the Asker could use the discussion page - by clicking the Open Discussion button shown below this answer - to tell us exactly what the circuit is, which "demands 208VAC single phase", that information would be interesting to know. Then, maybe, a much more helpful answer could then be given here!

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16y ago

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