“Official” boilerplate for the North American continent is: ANSI Std C84.1-1995 Electric Power Systems and Equipment—Voltage Ratings (60 Hertz)
2.1.3 System voltage classes
2.1.3.1 low voltage: A class of nominal system voltages 1000 volts or less.
2.1.3.2 medium voltage: A class of nominal system voltages greater than 1000 volts and less than 100,000 volts.
2.1.3.3 high voltage: A class of nominal system voltages equal to or greater than 100,000 volts and equal to or less than 230,000 volts.
[ANSI Std C92.2 considers EHV above 230kV and up to 800kV. Above 800kV is UHV.]
[This message has been edited by Bjarney (edited 03-10-2004).]
