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Not so far. The highest voltage yet attained for current electricity is 5 million volts: The highest electrical potential ever produced by man, over 5,000,000 volts, has been achieved in the laboratory of Dr. Gregory Breit and Dr. M.A. Tuve at the Department of Terrestrial Magnetism of the Carnegie Institution of Washington.
Two factors considered in classifying a voltage as high voltage are the possibility of causing a spark in air, and the danger of electric shock by contact or proximity. The definitions may refer to the voltage between two conductors of a system, or between any conductor and ground. In electric power transmission engineering, high voltage is usually considered any voltage over approximately 35,000 volts.